WO2011112214A1

WO2011112214A1 - Interactive mri system

Info

Publication number: WO2011112214A1
Application number: PCT/US2010/049016
Authority: WO
Inventors: Milan Trcka; Robert Heller; Adam Bazih
Original assignee: K-Space Llc
Priority date: 2010-03-12
Filing date: 2010-09-15
Publication date: 2011-09-15

Abstract

An MRI system having an interface unit that has an electrically grounded, non-magnetic RF shield covered housing that can be located in the MRI room, or preferably located in the control room. The housing has a computer system, a sound transmission system, an eye tracking system, a microphone system, a power filtering system and non-magnetic connectors for a data cable and a power cable each of which is replaceable. The interface unit also provides video and sound to the subjects, and is capable of receiving responses from the subject. Visual displays are connected to the interface unit for receiving and displaying visual images to the subject. The visual display has minimal magnetic material and is wearable having the general shape and size of goggles. A single data cable and a single power cable are connected to the visual display to provide power and to send/receive data.

Description

INTERACTIVE MRI SYSTEM

CROSS-REFERENCE

This application claims the benefit of United States Provisional Application No. 61/160,128 filed on March 13, 2009, which is incorporated herein by reference.

BACKGROUND

Magnetic resonance imaging ("MRI") systems and functional magnetic resonance imaging ("fMRI") systems are widely used for diagnosing the physical condition of subjects. They are also used as a research tool for determining the effect of various stimuli on brain activity. For research purposes, it is desirable that audio and/or video stimuli can be provided to a subject undergoing MRI. It is desirable to distract a subject from the MRI process, which can be claustrophobic due to tightly wound head coils. Thus, for even routine MRI, it is desirable that audio and/or visual stimuli be provided. MRI systems that can provide such stimuli are known. See, for example U.S. Patent No. 5,877,732.

However, existing systems that can provide stimuli suffer from one or more deficiencies, such as inability to be used with high power MRI systems such as those operating at 7 Tesla, discomfort for the subject, and limited capability of the interface system in providing input to the subject and receiving output from the subject.

Accordingly, there is a need for an interactive MRI system that overcomes one or more of these deficiencies of existing systems.

SUMMARY

This invention relates to a system that satisfies these needs. The system has two main components, a display device and an interface unit. The display device is for use for a subject in an MRI chamber or zone, and comprises a frame sized to be wearable by the subject on the subject's head and a pair of visual displays supported by the frame for producing a subject viewable image. Each visual display comprises a display housing and a display, preferably an OLED display. There is a support for holding the frame on the subject's head with the visual displays proximate to the subject's eyes. A video input connector and a power input connector are supported by the frame for receiving video input and input power, respectively. Optionally, there is provided a magnetic shield for the visual displays, the shield being substantially transparent to visible light. A preferred shield comprises plastic coated with indium tin oxide.

There can be a speaker supported by the farme, and at least one audio input connector for receiving audio input for the speaker.

Optionally, data providing means is provided for the subject to provide data. The data providing means can be an eye tracking system or a microphone, or other type of input device.

Preferably, the display device, other than OLEDs, contains substantially no magnetic material.

For example, the power input connector typically includes solder, and preferably the solder contains no magnetic material.

In addition to OLEDs, the display device typically comprises a prism.

In one configuration, the frame is close to the subject's eyes so the image produced by the display device is less than 50 mm from the subject's eyes.

Preferably, each visual display housing can independently be tilted relative to the frame, and the visual display housings can be moved independently closer or farther from the subject. Also, preferably, the visual display housings can be moved closer or farther apart from each other.

The interface unit is preferably portable and is for placement external to the MRI zone and is useful with the display device. The interface unit comprises an interface housing, a power input, and the following components, all supported by the interface housing: a power input connector, a video input connector, an audio input connector, an audio output connector, a video output connector, a subject input connector, and a power output connector. The audio output connector is for transmitting audio input to the audio input connector of the display device. The video output connector is for transmitting video input to the video input connector of the display device. The subject input connector is for receiving data from the subject. The power output connector is for delivering power to the power input connector of the display device.

Preferably, there is an RF shield affixed to at least a portion of the interface housing and a ground for the interface housing.

Typically, the audio input connector and the video input connector of the interface system are the same connector. Likewise, typically the audio input connector and the video input connector of the display device are the same connector. DRAWINGS

These and other features, aspects, and advantages of the present invention will become better understood with reference to the following description, accompanying claims, and appended drawings wherein:

Fig. 1 is a block diagram showing components of a system having features of the present invention;

Fig. 2 is a block diagram of an interface unit for use in the system of Fig. 1;

Fig. 3 is a top down schematic view of the interface unit of Fig. 2;

Fig. 4 is a side schematic view of the interface unit of Fig. 2;

Fig. 5 is a block diagram of an audio/video interface of the interface unit of Fig. 2;

Fig. 6 is a schematic view of an audio/video display device for use with the system of

Fig. 1;

Fig. 7 is a perspective view of an audio/video device useful in the system of Fig. 1;

Fig. 8 shows an audio video device of Fig.7 on a subject;

Fig.9 is a wiring diagram of the audio/video device;

Fig. 10A is a perspective view of a video display for use in the system of Fig. 1;

Fig. 10B is a side elevation view of the display of Fig. 10A;

Fig. IOC schematically shows the video display of Fig. 10A;

Fig. 11 shows a speaker system for use in the system of Fig. 1;

Fig. 12 shows a microphone for use in the system of Fig. 1;

Fig. 13A is a top plan schematic view of a call button for use in the system of Fig. 1;

Fig. 13B is a front schematic view of the call button of Fig. 13 A; and

Fig. 13C shows components of the call box system of Fig. 13A.

Fig. 14 is a perspective view of a portable interface system for use with a display device worn by a subject in an MRI chamber. Fig. 15 is a perspective view of a display device for use by a subject in an MRI environment.

DESCRIPTION

Introduction

According to one embodiment of the present invention, there is provided a device for performing interaction with a subject in Magnetic Resonance Imaging (MRI) or functional Magnetic Resonance Imaging (fMRI) devices. According to another embodiment of the present invention, there is provided a system for performing MRI or fMRI on a subject. According to another embodiment of the present invention, there is provided a method for performing MRI or fMRI on a subject. In one embodiment, the method comprises providing a device according to the present invention and using the device to perform magnetic resonance imaging on a subject.

As used herein, except where the context requires otherwise, the term "comprise" and variations of the term, such as "comprising," "comprises" and "comprised" are not intended to exclude other additives, components, integers or steps. Thus, throughout this specification, unless the context requires otherwise, the words "comprise", "comprising" and the like, are to be construed in an inclusive sense as opposed to an exclusive sense, that is to say, in the sense of "including, but not limited to".

As used herein the terms fMRI-compatible and MRI-compatible refer to devices that are intended for use during fMRI and MRI procedures, respectively, such that neither the data recorded by the device nor the data recorded by the procedure are reasonably considered as detrimentally affected by the joint usage of fMRI or MRI in practice.

An MRI-compatible device does not guarantee fMRI-compatibility. Examples of methods to make devices fMRI-compatible include, but are not limited to, use of non- ferromagnetic materials, such as plastic, to reduce attractive forces between the device and the superconducting magnet of the MRI scanner, and shielding to reduce electromagnetic interference that could corrupt the data measured device and corrupt the signal-to-noise ratio or contrast-to-noise ratio of the data.

As depicted in the Figures, all dimensions specified in this disclosure are by way of example only and are not intended to be limiting. Further, the proportions shown in these Figures are not necessarily to scale. As will be understood by those with skill in the art with reference to this disclosure, the actual dimensions of any device or part of a device disclosed in this disclosure will be determined by its intended use.

Overview of the System

Referring now to Figure 1, there is shown a system 100 having features of this invention. The system 100 comprises a control room 102 and an MRI room 104, wherein the MRI room comprises a magnet bore 106. The term "MRI room" also includes a room used for fMRI.

The control room 102 comprises a computer work station 108 optionally operated via a touch display screen 110 for controlling the system 100, a power supply 112, a video feed 114 providing video input, and an audio feed 116 providing audio input. The video feed 114 and the audio feed 116 can be optionally connected to the computer work station 108 or to any other device capable of video or audio output such as a DVD player (not shown). The MRI room 104 comprises an interface unit 118.

Within the magnet bore 106 are subject interface devices such as a portable audio visual system 120, a call button 122, a response device 124, and a manual controller such as a joystick 126, all of which are connected to the interface unit 118.

Control Room Components

The computer work station 108 can be any conventional computer such as those provided by Dell®, Hewlett-Packard®, and others. It typically includes computer memory, USB ports, a printer, a monitor, a keyboard, and a mouse. Optionally the monitor can be in the form of the touch display screen 110. The display touch screen 110 can be connected to the PC work station 108 through a standard USB connector 127. The work station 108 communicates with the interface unit 118 through an optical communication line 128. The power supply 112 provides external power to a power line 130 to the interface unit 118, and through the interface unit 118 to the magnet bore components. The power can be 12 volt DC. The optical connection line 128 is used for providing control signals and other input to the interface unit 118 and for receiving input obtained from a subject to the work station 108 to the control room. Preferably a single cable is used for transmitting the power and the control signals to the MRI room and for transmitting input from the subjects to the control room 102.

The video feed 114 and the audio feed 116 are transmitted to the interface unit 118 through respective SVGA fiber optic lines 132 and 134. Interface Unit

Referring to Figures 1 and 4, the interface unit 118 comprises a transformer 202 connected to the power supply 112, an interface computer 204 connected to the transformer 220, a magnetic shielding housing 206 surrounding the interface computer 204, a network interface 208 connected electronically to the interface computer 204 and connected to the computer workstation 108 via the optical Ethernet connection 128 using optical signals, a data storage unit 212 connected electronically to the interface computer 204, an auxiliary interface 214 connected electronically to the interface computer 204, and an audio/video goggle interface 216 connected electronically to the interface computer 204, wherein the interface unit 118 is sufficiently shielded by the magnetic shielding housing 206 that it can be used in the MRI room 104 exported to the MRI magnetic field. The interface unit 118 optionally comprises a video capture card 218 connected to the interface computer 204, an optional eye tracker interface 220 connected electronically to the video capture card 218, a data acquisition unit 222 connected electronically to the interface computer 204, and an optional subject monitor receiver 224 connected electronically to the data acquisition unit 222.

The interface computer 204 comprises a circuit board 226 and a single board computer (SBC) 228. In a preferred embodiment, the circuit board 226 is a printed circuit board and the SBC 228 is a mini-ΓΓΧ motherboard, such as a CommellxM LV-679 available from Taiwan Commate Computer, Inc., 8F, No. 94, Sec. 1, Shin Tai Wu Rd., Hsin Chin, Taipei Hsien, Taiwan. In a preferred embodiment, the interface computer 204 is loaded with active noise cancellation (ANC) software such as described in U.S. Patent No. 5,427,102 or U.S. Patent No. 5,440,641. This software enables a background audio input into the interface computer, software to produce an output sound that is a 180-degree phase- shift sound from the background audio input such that the output sound cancels the background audio input, and an audio output to deliver the output sound. In this way the subject benefits by not having the typical MRI noise around. The administrator benefits through better research results, as the subject is less likely to move around. In another preferred embodiment, the SBC 228 further comprises a DVI monitor output 229 for outputting video image to the computer work station 108.

The magnetic shielding housing 206 can comprise a computer housing 230 containing the interface unit 118 and a cooler 232 thermally connected to the interface computer 204 and to the data storage unit 212, which has a heat sink 236. In a preferred embodiment, the cooler 232 comprises a high surface area grid to conduct heat to surrounding air. In an especially preferred embodiment, the high surface area grid is comprised of aluminum and has dimensions 12.25" x 2.3" x 12". In a preferred embodiment, the cooler 232 is thermally connected to the circuit board 226 by means of a thermally conductive gap filler, such as BerquistxM GP2500S20, available from The Berquist Company in Chanhassen, MN, measuring 6.7" x 6.7" x 0.2". In a preferred embodiment, the interface computer 204 further comprises air and the cooler 232 further comprises a CPU cooler 234 in thermal contact with the circuit board 226, the air inside the interface computer 204, and the heat sink 236. With this design, there is significant cooling with a few moving parts that can interfere with the MRI or fMRI.

The network interface 204 is a converter box capable of converting the optical signal into a standard electronic signal for use in the interface computer 204. In a preferred embodiment, the network interface 204 is a Copper Gigabit Ethernet to Small Form-factor Pluggables (SFP) Fan-less system and is connected to the interface computer 204 with a 1000-BaseT Ethernet connection and to the computer workstation 108 by a 1000-Base SX Gigabit Optical Ethernet cord. The Copper Gigabit Ethernet to SFP Fan-less system can be an Allied Telesis® AT- MC1008/SP 1000T available from Allied Telesis, 19800 North Creek Parkway, Bothell WA. The 1000-Base SX Gigabit Optical Ethernet cord can be an Opticis North America® CAB- DVIFO-30MM available from 330 Richmond St., Chatham, Ontario, Canada.

In a preferred embodiment, the data storage unit 212 is a solid-state hard drive without moving parts and is connected to the heat sink 236. The solid-state hard drive can be an Intel® SSD 80 GB storage unit, available from Intel Corporation, 2200 Mission College Blvd, Santa Clara, CA. The data storage unit 212 is connected to the interface computer 204 by a serial ATA (SATA) connection. In another preferred embodiment, there is a plurality of data storage units, each connected to the interface computer 204 and to the heat sink 236. Solid-state hard drives are better for use in the MRI room due to their lack of moving parts. Typical hard drives have electric motors that can interfere with MRI and fMRI.

In a preferred embodiment, the auxiliary interface 214 is connected to the interface computer 204 through a standard two-way electronic communication means, such as a USB cable or wirelessly. The auxiliary interface 214 comprises a circuit to convert between electrical and optical signals and communication means to send and receive an optical signal through fiber optic cables. An example of the communication means is a photodiode circuit, light-emitting diode (LED), or photodetector, such as an Industrial Fiber Optics® IF-E96 for converting electrical signals into optical signals and an Industrial Fiber Optics® IF-D95 for converting optical signals into electrical signals, both available from Industrial Fiber Optics, Inc., 1725 West 1st Street, Tempe, AZ.

The interface unit 118 includes an audio/video goggle interface 216, shown in Figure 5.

The audio/video goggle interface 216 comprises a non-magnetic male electrical connector 302 connected to the SBC 228; a Digital Visual Interface (DVI) connector 304 connected to the control room 102; a front panel (FP) audio connector 306 connected to the control room 102; an interface system 308 connected to the DVI connector 304, to the FP audio connector 306, and to the non-magnetic male electrical connector 302; a non-magnetic female electrical connector 310 electrically connected to the interface system 308; and a fiber connector 312 electrically connected to the interface system 308. In a preferred embodiment, the non-magnetic male electrical connector 302 and the non-magnetic female electrical connector 310 are ITT Cannon® D-Subminiature non-magnetic connectors available from ITT Interconnect Solutions, 5288 Valley Industrial Blvd S, Shakopee, MN.

The DVI connector 304 is configured to receive video information from the video feed 114, while the FP audio connector 306 is configured to receive audio information from the audio feed 116. The non-magnetic male electrical connector 302 is configured to have a plurality of electrical connections with the SBC, including an SBC video signal connection 314, an SBC communication signal connection 316, an SBC audio signal connection 318, a microphone SBC connection 320, and a power connection 322.

The interface system 308 comprises a DVI to Super Video Graphics Array (SVGA) converter 324 connected to the DVI connector 304 through a DVI cable 305; a video selector 326 connected to the DVI to SVGA converter 324 through an SVGA cable and connected to the SBC video signal connection 314 through a cable communicating SVGA, color, and synchronicity video information; an interface controller 328 connected to the SBC communication signal connection 316 by a two-way connection cable, such as a USB cable; a control logic 330 connected to the interface controller 328; a digital to analog converter (DAC) 332 connected to the control logic 330 with an interface such as a two-wire interface (TWI) or serial peripheral interface (SPI); a fiber receiver DAC 334 connected to the FP audio connector 306 by an optical cable and configured to convert an optical audio signal to an electric signal; an audio mixer 336 connected to the fiber receiver DAC 334 and to the SBC audio signal connection 318, configured to combine the two audio signals into one electrical signal; a speaker amp 338 connected to the audio mixer 336; a communication microphone line amplifier 340 connected to the microphone SBC connection 320; a regulator 342 connected to the power connection 322; a first electro-optical converter 344 connected to the control logic 330 and configured to convert an electrical signal to an optical signal; and a second electro-optical converter 346 connected to the control logic 330 and configured to convert an optical signal into an electrical signal. In a preferred embodiment, the first electro-optical converter 344 is an Industrial Fiber Optics® IF-E96 and the second electro-optical converter 346 is an Industrial Fiber Optics® IF-D95, both available from Industrial Fiber Optics, Inc., 1725 West 1st Street, Tempe, AZ.

The non-magnetic female electrical connector 310 is configured to have plurality of electrical connections with the audio/video goggle interface 216, such as a display drive 348 connected to the video selector 326 through a video cable such as SVGA to communicate video signal, a display control 350 connected to the control logic 330, a voltage output 352 connected to the DAC 332, a speaker connection 354 connected to the speaker amp 338, a microphone connection 356 connected to the communication line microphone amplifier 340, and a goggle power connection 358 connected to the regulator 342. The fiber connector 312 comprises a call button connector 360 connected to the first electro-optical converter 344 and to the second electro-optical converter 346.

In a preferred embodiment, audio/video goggle interface 216 further comprises a noise cancellation connection 362 in the non-magnetic female electrical connector 310; and a noise canceling microphone interface 364 located in the interface system 308 and connected to the noise cancellation connection 362, to the control logic 330, and to the audio mixer 336 in such a way as to deliver background noise for active noise cancellation from the interface computer 204 in an audio output.

In a preferred embodiment, the video capture card 218 is a Commell® mini-PCI, available from Taiwan Commate Computer, Inc., 8F, No. 94, Sec. 1, Shin Tai Wu Rd., Hsin Chin, Taipei Hsien, Taiwan, and is connected to the eye tracker interface 220 through a NTSC Video cable.

The eye tracker interface 220 is capable of receiving video image from a fiber optic cable and converting the signal from the fiber optic cable into an electrical signal.

In a preferred embodiment, the data acquisition unit 222 is a 16 channel National Instruments® DAQ NI PCIe-6259, available from National Instruments Corp., 11500 N Mopac Expwy., Austin, TX, and is connected to the interface computer 204 through a Peripheral Component Interconnect Express (PCIe) connection. In a preferred embodiment, the data acquisition unit 222 is configured to receive both digital and analog electrical signals from the subject monitor receiver 224.

In a preferred embodiment, the subject monitor receiver 224 is capable of receiving signals from the subject regarding the subject's heart rate, respiration, temperature, oxygen levels, and brain electrical activity according to methods known in the art, such as U.S. Patent No. 6,731,976, and U.S. Patent No. 6,533,733.

Magnet Bore Components

Referring now to Figures 6-9, items in the magnet bore 106 can be seen.

The audio/video goggle system 120 is connected to the audio/video goggle interface 216 through an electronic cable having a second non-magnetic male connector 502 with a ground connection 503 and comprises a visual display 504, a sound transmission system 506 connected to the second non-magnetic male connector 502 through audio cables 507, and a microphone system 508. The second non-magnetic male connector 502 connects to the non-magnetic female connector 310. The visual display 504 is connected to the audio/video goggle interface 216 through cables communicating video information 509 and comprises a left display 510; a right display 512; a display logic 514 connected to the second non-magnetic male connector 502 through logic cables 515, to the left display 510, and to the right display 512; and a plurality of voltage controllers 516 connected to the second non-magnetic male connector 502 through voltage cables 517, to the left display 510, and to the right display 512. The audio/video goggle system 120 optionally further comprises an eye tracker system 518 that is connected to the optional eye tracker interface 220. The microphone system 508 is connected to the second nonmagnetic male connector 502 through a microphone cable 519.

In a preferred embodiment, the left display 510 and right display 512 each further comprise an organic light-emitting diode (OLED) system or other LED system 520 for receiving and transmitting video images, a prism or mirror system 522 for receiving video images from the OLED system or LED system 520, and a diopter adjustment mechanism 524 for adjusting the distance between the prism or mirror system 522 and the OLED system or LED system 520. The diopter adjustment mechanism 524 can be manual, such as a threaded rod, or can comprise a non-magnetic motor, such as a miniature piezoelectric micromotor, such as a Squiggle® motor. The prism or mirror system 522 receives the video signal from the OLED system or LED system 520 and transmits it to the subject without the need for a lens. The OLED system or LED system 520 and the prism or mirror system 522 used can be an eMagin® WF05 optics module, comprising an active matrix OLED-on-Silicon microdisplay, available from eMagin Corporation, 10500 NE 8th Street, Bellevue, WA. This module is the preferred display mechanism since its display does not degrade in magnetic fields up to at least 7 Tesla.

The sound transmission system 506 can especially be seen in Figure 11. The sound transmission system 506 used is a modified version of a Mallory Sonalert Products® PT- 2060WQ, available from Mallory Sonalert Products, Inc., 4411 South High School Road, Indianapolis, IN, and comprises a piezoelectric speaker 526 that converts an electric signal to an acoustic audio signal, an acoustic waveguide 528 receiving the audio signal and attached to the piezoelectric speaker 526, and an earpiece 530 attached to the acoustic waveguide 528 and located proximal to a subject's ear. The Mallory Sonalert Products® PT-2060WQ is modified through wire-stripping and magnetically shielding with a material capable of magnetic shielding, such as mylar or copper braiding. The sound transmission system 506 can also further comprise ceramic speakers. In a preferred embodiment, the sound transmission system 506 further comprises noise cancellation microphones 532 that pick up MRI background noise. These noise cancellation microphones 532 deliver an audio signal to the audio/video goggle interface 216 through noise cancellation cables 533, shown in Figure 9.

The microphone system 508 can especially be seen in Figure 12. The microphone system 508 used is a non-magnetic microelectromechanical system (MEMS) microphone 534 connected to the microprocessor through an acoustic waveguide 536, wherein the acoustic waveguide 536 is configured to have an opening near the subject's mouth for receiving verbal communication. In a preferred embodiment, the MEMS microphone 534 is an analog output single chip MEMS microphone with an integrated transducer and associated circuitry on a single piece of silicon, such as an Akustica® AKU1126, available from Akustica, Inc., 2835 East Carson Street, Suite 301, Pittsburg, PA, and modified through wire-stripping and magnetically shielding with a material capable of magnetic shielding, such as mylar or copper braiding.

In a preferred embodiment, the visual display 504, sound transmission system 506, and microphone system 508 are a unitary unit having the general shape of binocular goggles, and the audio/video goggle system 120 further comprises an inter-pupillary adjustment mechanism. The inter-pupillary adjustment mechanism can be manual, such as a threaded rod, or comprise a nonmagnetic motor. The audio/video goggle system 120 is mounted to a face module made of a biocompatible non-magnetic material, such as flexible plastic, silicone, or polyurethane. In another preferred embodiment, the audio/video goggle system 120 further comprises a removable shield 538 for placement on the unitary unit between the unitary unit and the subject. In a preferred embodiment, the audio/video goggle system 120 further comprises a strap securing the audio/video goggle system 120 to the subject. In another preferred embodiment, the audio/video goggle system 120 is connected to the audio/video goggle interface 216 through a single 37-pin cable, as shown in Figure 9. The single cable can also be magnetically shielded through braided shielding as is known in the art and has the advantage of minimizing interference with the MRI or fMRI.

The call button 122 can especially be seen in Figures 13A-C. The call button 122 comprises a first fiber optic cable 602 having a first end and an opposed second end, wherein the first end is closer to the subject than to the control room 102; a second fiber optic cable 604 having a first end and an opposed second end, wherein the first end is closer to the subject than to the control room 102; a housing 606 holding the first end of the first fiber optic cable 602 and the first end of the second fiber optic cable 604 in such a way as to make the first end of the first fiber optic cable 602 and the first end of the second fiber optic cable 604 proximal to each other using a base 607 and a fiber support 608 so that there is an optical path between the two fiber optic cables; a light interruption mechanism 610 within the housing 606 such as a mirror or prism that is configured to come between the first end of the first fiber optic cable and the first end of the second fiber optic cable; a disk 612 attached to the light interruption mechanism 610, located outside of the housing 606, and configured in such a way that a subject blocks the optical path by pushing down on the disk; and a spring 614 such that when a subject pushes the disk down the spring 614 delivers a force to push the disk back up and re-open the optical path. The first fiber optic cable 602 and the second fiber optic cable 604 are connected to the call button connector 360 of the audio/video goggle interface 216. The first fiber optic cable 602 receives an optical input from the audio/video goggle interface 216 and transmits it to the second fiber optic cable 604.

The response device 124 comprises at least one input button. Each button is constructed in a similar way to the call button 122 and comprises a first fiber optic cable having a first end and an opposed second end, wherein the first end is closer to the subject than to the control room 102; a second fiber optic cable having a first end and an opposed second end, wherein the first end is closer to the subject than to the control room 102; a housing holding the first end of the first fiber optic cable and the first end of the second fiber optic cable in such a way as to make the first end of the first fiber optic cable and the first end of the second fiber optic cable proximal to each other using a base and a fiber support so that there is an optical path between the two fiber optic cables; a light interruption mechanism within the housing such as a mirror or prism that is configured to come between the first end of the first fiber optic cable and the first end of the second fiber optic cable; a disk attached to the light interruption mechanism, located outside of the housing, and configured in such a way that a subject blocks the optical path by pushing down on the disk; and a spring such that when a subject pushes the disk down the spring delivers a force to push the disk back up and re-open the optical path. The first fiber optic cable and the second fiber optic cable are connected to the auxiliary interface 214. In another embodiment, there is plurality of subject input buttons.

The manual controller, or joystick, 126 is constructed in a similar way to the call button 122 and comprises a first fiber optic cable having a first end and an opposed second end, wherein the first end is closer to the subject than to the control room 102; a second fiber optic cable having a first end and an opposed second end, wherein the first end is closer to the subject than to the control room 102; a housing holding the first end of the first fiber optic cable and the first end of the second fiber optic cable in such a way as to make the first end of the first fiber optic cable and the first end of the second fiber optic cable proximal to each other using a base and a fiber support so that there is an optical path between the two fiber optic cables; a light interruption mechanism within the housing such as a mirror or prism that is configured to come between the first end of the first fiber optic cable and the first end of the second fiber optic cable in an incremental way; a hand-held control stick attached to the light interruption mechanism, located outside of the housing, and configured in such a way that a subject partially blocks the optical path by moving the control stick in a direction; and a spring such that when a subject moves the control stick the spring delivers a force to push the control stick back into a its original position and re-open the optical path. When a subject partially blocks the optical path, an analog signal is sent to the auxiliary interface 214. The first fiber optic cable and the second fiber optic cable are connected to the auxiliary interface 214.

In another embodiment, the joystick 126 comprises a first plurality of fiber optic cables, wherein each fiber optic cable of the first plurality of fiber optic cables has a first end and an opposed second end, wherein the first end of each of the fiber optic cables is closer to the subject than to the control room 102; a second plurality of fiber optic cables, wherein each fiber optic cable of the second plurality has a corresponding fiber optic cable of the first plurality and forms a pair, wherein each fiber optic cable of the second plurality of fiber optic cables has a first end and an opposed second end, wherein the first end of each of the fiber optic cables is closer to the subject than to the control room 102; a housing holding the first end of each of the fiber optic cables in such a way as to make the first end of each fiber optic cable of the second plurality proximal to the first end of each corresponding fiber optic cable of the first plurality using a base and a fiber support so that there is an optical path between each pair of fiber optic cables forming a plurality of optical paths; a light interruption mechanism within the housing such as a mirror or prism that is configured to interrupt the optical path between one or more than one of the fiber optic cable pairs; a hand-held control stick attached to the light interruption mechanism, located outside of the housing, and configured in such a way that a subject blocks one or more than one optical path by moving the control stick in a direction; and a spring such that when a subject moves the control stick the spring delivers a force to push the control stick back into a its original position and re-open the optical paths. The first plurality of fiber optic cables and the second plurality of fiber optic cables are connected to the auxiliary interface 214.

In another embodiment, there is an audio adjustment mechanism, comprising a first plurality of fiber optic cables, wherein each fiber optic cable of the first plurality of fiber optic cables has a first end and an opposed second end, wherein the first end of each of the fiber optic cables is closer to the subject than to the control room 102; a second plurality of fiber optic cables, wherein each fiber optic cable of the second plurality has a corresponding fiber optic cable of the first plurality and forms a pair, wherein each fiber optic cable of the second plurality of fiber optic cables has a first end and an opposed second end, wherein the first end of each of the fiber optic cables is closer to the subject than to the control room 102; a housing holding the first end of each of the fiber optic cables in such a way as to make the first end of each fiber optic cable of the second plurality proximal to the first end of each corresponding fiber optic cable of the first plurality using a base and a fiber support so that there is an optical path between each pair of fiber optic cables forming a plurality of optical paths; a light interruption mechanism within the housing such as a mirror or prism that is configured to interrupt the optical path between one or more than one of the fiber optic cable pairs; a knob attached to the light interruption mechanism, located outside of the housing, and configured in such a way that a subject blocks one or more than one optical path by moving the knob in a direction; and a spring such that when a subject moves the knob the spring delivers a force to push the knob back into a its original position and re-open the optical paths. The first plurality of fiber optic cables and the second plurality of fiber optic cables are connected to the auxiliary interface 214. The audio adjustment mechanism is configured in such a way to adjust audio properties of the audio signal in the earpiece 530.

Referring now to Fig. 14 there is shown a perspective view of a portable interface system 1400 for use with a display device 1500 worn by a subject in an MRI chamber. The term "portable" refers to a mechanical device or electrical apparatus manufactured in smaller and lighter form than normal, thereby easier to be carried about by a single person. The portable interface system 1400 can comprise a housing 1402, a power input connector supported by the housing, 1406 a video input connector 1406 supported by the housing, an audio input connector 1406 supported by the housing, an audio out put connector 1406 supported by the housing 1402 for transmitting audio input to the display device 1500, a video output connector 1406 supported by the housing 1402vfor transmitting video input to the display device 1500, a subject input connector 1406 supported by the housing 1500 for receiving input from the subject, a power output connector 1404 supported by the housing 1402 for delivering power to the display device 1500, an RF shield 119 affixed to at least a portion of the housing 1402 and a connector for grounding the RF shield 119 and the housing 1402. Additionally, the system 1400 comprises a processor, memory and storage. The storage contains non-transitory instructions to process the inputs and outputs from the system 1400. The processor performs tasks autonomously in accordance with the programs in storage or in response to commands received from the control room 102. The RF shield 119 and the housing 1402 are grounded to create an electrical waveguide with the cable shielding to conduct any stray electrical emissions back to the portable interface system 1400 and then to electrical ground. In a preferred embodiment the power input and output connectors are the same connector. In another preferred embodiment, the video input connector 1406, audio input connector 1406, audio out put connector 1406, video output connector 1406 and subject input connector 1406 are the same connector.

The portable interface system 1400 also comprises a power filtering system 112 in the housing 1402. The power filtering system takes standard electrical power and reduces the noise and stray RF emissions found in commonly supplied power, to provide power to the remote components, such as, for example, the display device 1500. The reduced noise power is more transparent to the MRI or fMRI thereby increasing the resolution of the resulting images. Optionally, the power filtering system 112 can also regulate voltage frequencies and amplitudes supplied to various components of the system 1400 and convert power input from alternating current to direct current.

The portable interface system 1400 can be placed inside the MRI or fMRI chamber or the system 1400 can be placed in the control room. The power and data connections are passed through the barrier between the control room 102 and the MRI chamber 106 and connected to the display device 1500. In a preferred embodiment a data cable 1408 is provided, the data cable being a fiber optic cable that transmits and receives eye tracking data, audio information, video information and control signals. The fiber optic cable 1408 is preferably connected to the portable interface system 1400 by a single connector 1406. The data cable connector 1406 and power connector 1404 are non-magnetic and the cables 1408 and 1410 are further shielded to reduce any RF or magnetic interference with the MRI or fMRI. The term "non-magnetic" refers substances that are negligibly affected by magnetic fields and are not capable of being magnetized such as copper, aluminum, brass, and plastic. Examples of materials that are magnetic are nickel, iron, cobalt, gadolinium and their alloys

Referring now to Fig. 15 there is shown a perspective view of the display device 1500 for use by a subject in an MRI environment. The display device 1500 comprises a frame 1502 that is adjustable to fit on the subjects head comfortably, a pair of visual displays 1504 and 1506 that are attachable to the frame 1502. The visual displays 1504 and 1506 produce images for viewing by the subject during the MRI or fMRI. The images can be used to either relax the subject or to present the subject with information requiring a response, such as during an experiment. The images are produced by OLED displays 520 that have been modified. The modifications include removal of all magnetic components and replacing the components with non-magnetic components to be transparent to the MRI. Connections to the OLEDs 520 are made with non- magnetic solder such as 96Sn-4Ag alloy or any other RHOS compliant solder. The visual displays 1504 and 1506 are adjusted to be proximate to the subject for optimum viewing. In a preferred embodiment the distance is not more than 50mm.

Optionally, the visual displays 1504 and 1506 can comprise speakers, microphones and eye tracking devices within the same visual displays 1504 and 1506. The speakers can be in the form of ceramic ear buds that can be attached to the visual displays 1504 and 1506 to provide better quality sound to the subject.

A single data cable 1408, preferably a fiber optic cable, is connected to both visual displays 1504 and 1506. The single data cable 1408 can transmit to and receive from the subject various information, such as, for example, audio information, visual information and eye tracking information among others. A single power cable 1410 supplies the power required to run the visual displays 1504 and 1506 and all other equipment located in the visual displays 1504 and 1506. All the components housed inside the visual displays 1504 and 1506, other than the OLEDs 520, contain substantially no magnetic material to prevent interference with the MRI. The OLEDs 520, because of the process of manufacture, contain some magnetic and RF generating material. To reduce the interference with the MRI, the OLEDs 520 are shielded using a polyester foil coated with Indium-Tin Oxide. Other transparent; scratch resistant and nonmagnetic material coated with transparent conductive layer (such as ITO) can be used, such as, for example, glass, polycarbonate (Lexan), Acrylic (Plexiglas). The images produced by each OLED 520 is magnified by a prism 1510 and 1512 in each visual display 1502 and 1504, respectively.

Each visual display 1502 and 1504 can independently be tilted and swiveled relative to the frame so the subject obtains maximum benefit from the visual displays 1502 and 1504. Additionally, the inter-pupillary distance and distance from the subject's eyes can also be independently moved.

Although the present invention has been discussed in considerable detail with reference to certain preferred embodiments, other embodiments are possible. Therefore, the scope of the appended claims should not be limited to the description of preferred embodiments contained in this disclosure.

Advantages The previously described embodiments of the present invention have many advantages, including an audio/video system with minimal magnetically susceptible components and a compact design for fitting into tighter head coils.

Features of the System

The following summarizes certain features of the system:

1. A system for use in an MRI device used with a subject comprising:

a) an interface comprising a microprocessor for receiving a video input and an audio input, and for receiving subject generated sound input and subject generated control input;

b) a visual display for receiving from the interface the video input and for displaying to the subject visual images, the video display comprising left and right displays and first adjustment means for adjusting the distance between the left and right displays, each display comprising:

i) an OLED for receiving the video input and transmitting video images; ii) a prism receiving the video images from the OLED; and

iii) second adjustment means for adjusting the distance between the prisms and the OLED;

c) a sound suppression circuit in the interface for suppressing sound emanating from the MRI device by generating a sound suppression signal;

d) a sound transmission system wearable by the subject, wherein the sound transmission system receives the audio input and the sound suppression signal from the interface; e) a microphone system for receiving subject generated sound for transmission to the interface as subject generated sound input; and

f) a subject controllable input device for providing subject inputs to the interface; and

g) a subject monitor receiver in the interface for receiving physiological information about a subject.

wherein the system is sufficiently shielded that it can be used in an MRI room. 2. The system of claim 1 wherein the visual display, the sound transmission system, and the microphone system are a single subject wearable unit having the general shape of binocular goggles.

3. The system of claim 1 comprising a protective removable shield between the subject wearable unit and the subject.

4. The system of claim 1 wherein the first adjustment means comprises a motor.

5. The system of claim 1 wherein the second adjustment means comprises a motor.

6. The system of claim 1 wherein the subject controllable input device comprises a button, light input guide, light output guide, and a mirror reflecting input light from the light input guide to the light output guide.

7. The system of claim 2 wherein the sound transmission system comprises a pair of ceramic speakers proximate to the visual display, a sound transmitting flexible tube from each speaker to a respective ear bud.

8. The system of claim 2 wherein the microphone system comprises a microphone proximate to the visual display and a flexible tube sufficiently long to be proximate to a subject's mouth.

9. An MRI system for administering MRI to subjects, the MRI system comprising:

a) an MRI device for use in an MRI room;

b) a control room external to the MRI room;

c) an interface in the MRI room for receiving control signals and audio and video inputs and power from the control room, and for transmitting input from subjects to the control room; and

d) a single cable for transmitting the power and the control signals to the MRI room, and for transmitting input from subjects to the control room.

10. A visual display for use by a subject in an MRI, the video display comprising left and right displays and distance adjustment means for adjusting the distance between the left and right displays, each display comprising:

i) an OLED for receiving the video input and transmitting video images; and ii) a prism receiving the video images from the OLED.

11. The system of claim 10 wherein the adjustment means comprises a motor.

12. An MRI system for administering MRI to subjects, the MRI system comprising:

a) an MRI device for use in an MRI room;

b) a control room external to the MRI room;

c) a shielded interface unit in the MRI room for receiving a video input and an audio input and control signals from the control room, and for receiving subject generated sound input and subject generated control input;

e) a visual display for receiving from the interface unit the video input and for displaying to the subject in the MRI room visual images;

f) a sound suppression circuit in the interface unit for suppressing sound emanating from the MRI device by generating a sound suppression signal;

g) a sound transmission system for providing sound to the subject in the MRI room, wherein the sound transmission system receives the audio input and the sound suppression signal from the interface unit;

e) a microphone system in the MRI room for receiving subject generated sound for transmission to the interface unit as subject generated sound input;

f) a subject controllable input device in the MRI room for providing subject inputs to the interface unit; and

g) a subject monitor receiver in the interface unit for receiving physiological information about a subject.

Claims

IN THE CLAIMS:

1. A display device for use by a subject being exposed to MRI comprising:

a) a frame sized to be wearable by the subject on the subject's head;

b) a pair of visual displays supported by the frame for producing a subject viewable image, each visual display comprising a housing and an OLED display;

c) a support for holding the frame on the subject's head with the visual displays proximate to the subject's eyes;

d) a video input connector supported by the frame for receiving video input for display by the visual displays; and

e) a power input connector supported by the frame for receiving input power to power the visual displays,

wherein the display device, other than the OLEDs, contains substantially no magnetic material.

2. The display device of claim 1 wherein each visual display comprises a prism.

3. The display device of claim 1 wherein the frame is configured so that the distance between the subject's eyes and the image is less than 50 mm.

4. The display device of claim 1 comprising a magnetic shield for the visual displays, the shield being substantially transparent to visible light.

5. The display device of claim 4 wherein the shield comprises plastic coated with indium tin oxide.

6. The display device of claim 1 wherein the power input connector comprises substantially non-magnetic solder.

7. The display device of claim 1 wherein each visual display housing can independently be tilted relative to the frame.

8. The display device of claim 1 or 7 wherein the visual display housings can be moved independently closer or farther from the subject.

9. The display device of claim 8 wherein the visual display housings can be moved closer or farther apart from each other.

10. The display device of claim 1 wherein the visual display housings can be moved closer or farther apart from each other.

11. The display device of claim 1 comprising in addition an eye movement tracking system supported by the frame.

12. The display device of claim 1 comprising in addition a microphone supported by the frame.

13. The display device of claim 1 comprising in addition speakers supported by the frame.

14. A display device for use by a subject in an MRI environment comprising:

a) a frame sized to be wearable by the subject on the subject's head;

b) a pair of visual displays supported by the frame for producing a subject viewable image, each visual display comprising a housing and an OLED display ;

d) a video connector supported by the frame for receiving video input for display by the visual displays; and

e) a power connector supported by the frame for receiving input power to power the visual displays; and

f) a magnetic shield for the visual displays, the shield being substantially transparent to visible light.

15. The display device of claim 14 wherein the shield comprises plastic coated with indium tin oxide.

16. A portable interface system for use with a display device worn by a subject in an MRI chamber comprising:

a) a housing;

b) a power input connector supported by the housing;

c) a video input connector supported by the housing;

d) an audio input connector supported by the housing;

e) an audio out put connector supported by the housing for transmitting audio input to the display device;

f) a video output connector supported by the housing for transmitting video input to the display device;

g) a subject input connector supported by the housing for receiving input from the subject;

h) a power output connector supported by the housing for delivering power to the display device;

i) an RF shield affixed to at least a portion of the housing; and

j) a ground for the housing.

17. The portable interface system of claim 16 comprising a power filtering system to reduce RF noise from supplied power.

18. An interface unit for use in an MRI device used with a subject comprising:

a) a housing;

b) a non-magnetic RF shield covering at least a portion of the housing; and c) an internal electrical ground affixed to the non-magnetic RF shield and the housing.

19. A system for use with a subject in an MRI chamber comprising:

a) a display device for use by the subject comprising:

i) a frame sized to be wearable by the subject on the subject's head;

ii) a pair of visual displays supported by the frame for producing a subject viewable image, each visual display comprising a display housing and an OLED display;

iii) a support for holding the frame on the subject's head with the visual displays proximate to the subject's eyes;

iv) a video input connector supported by the frame for receiving video input for display by the visual displays;

v) a power input connector supported by the frame for receiving input power to power the visual displays;

vi) a magnetic shield for the visual displays, the shield being substantially transparent to visible light;

vii) at least one speaker;

viii) at least one audio input connector for receiving audio input for the speaker; and

ix) data providing means for the subject to provide data,

wherein the display device, other than the OLEDs, contains substantially no magnetic material; and

b) a portable interface system for placement external to the chamber and for use with the display device comprising:

i) an interface housing;

ii) a power input connector supported by the interface housing; iii) a video input connector supported by the interface housing; iv) an audio input connector supported by the housing;

v) an audio output connector supported by the interface housing for transmitting audio input to the audio input connector of the display device;

f) a video output connector supported by the interface housing for transmitting video input to the video input connector of the display device;

g) a subject input connector supported by the interface housing for receiving the data from the subject;

h) a power output connector supported by the interface housing for delivering power to the power input connector of the visual display;

i) an RF shield affixed to at least a portion of the interface housing; and j) a ground for the interface housing.

20. The system of claim 19 wherein the data comprises eye tracking data.

21. The system of claim 19 wherein the data comprises audio from a microphone.

22. The system of claim 16 wherein the audio input connector and the video input connector are the same connector.

23. The system of claim 16 wherein the audio output connector and the video output connector are the same connector.

24. The display device of claim 1 wherein the display device video input connector and audio input connector are the same connector.