CN101268943B - Magnetic resonance imaging apparatus and method, magnetic-resonance imaging maintenance apparatus and system - Google Patents
Magnetic resonance imaging apparatus and method, magnetic-resonance imaging maintenance apparatus and system Download PDFInfo
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- CN101268943B CN101268943B CN2008100871238A CN200810087123A CN101268943B CN 101268943 B CN101268943 B CN 101268943B CN 2008100871238 A CN2008100871238 A CN 2008100871238A CN 200810087123 A CN200810087123 A CN 200810087123A CN 101268943 B CN101268943 B CN 101268943B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
- G01R33/3664—Switching for purposes other than coil coupling or decoupling, e.g. switching between a phased array mode and a quadrature mode, switching between surface coil modes of different geometrical shapes, switching from a whole body reception coil to a local reception coil or switching for automatic coil selection in moving table MR or for changing the field-of-view
Abstract
The invention provides a magnetic resonance image pickup device, a magnetic resonance image pickup maintenance device, a magnetic resonance image pickup maintenance system and a magnetic resonance image pickup device check method, wherein a real-time system uses pulse sequence to collect data without applying phase coding, aiming at combination of each echo variation coil element and allocation for channels. After that, a host system computes the data for restructuring each channel and associated value of reference data, and judges the combination of the coil element as abnormality when the associated value is less than the stated threshold value. In addition, the host system performs electric level correction to the collected data and produces an alternative proposal for the abnormal combination of the coil element on condition of containing situation of the number of the reduced channels.
Description
The cross reference of related application
The application enjoys the interests of priority of the Japanese patent application No. 2007-334382 of the Japanese patent application No. 2007-071280 of on March 19th, 2007 application and December in 2007 application on the 26th, quotes the full content of these Japanese patent applications in this application.
Technical field
The combination that the present invention relates to change the key element coil of receiving magnetic resonance signals comes the coil inspection technology of magnetic resonance imaging apparatus that channel is distributed.
Background technology
The nuclear magnetic resonance of being undertaken by magnetic-resonance imaging (MRI:Magnetic Resonance Imaging) device is following image capture method: will place the those who are investigated's of magnetostatic field nuclear spin to excite with the high-frequency signal magnetic of its Larmor frequency, and according to following this magnetic resonance that excites generation (MR) signal reconstruction image.
In order to carry out this image capture method, magnetic resonance imaging apparatus has magnetostatic field magnet that generates magnetostatic field and pulse train according to the rules applies leaning magnetic field pulse and high frequency magnetic field pulse to those who are investigated mechanism.Wherein, the leaning magnetic field pulse is configured in the hole (bore) of magnetostatic field magnet, and sends to those who are investigated via the gradient magnetic field coil that is connected with the leaning magnetic field power supply.In addition, the high frequency magnetic field pulse is configured in the hole of magnetostatic field magnet similarly, and sends to those who are investigated via the transmission that is connected with transmitter with high frequency coil.On the other hand, in order to receive the magnetic resonance signal that constitutes by the high-frequency signal that produces from those who are investigated, with receive with high frequency coil be configured in those who are investigated near.Sometimes be also used as to send with a coil and use high frequency coil, but in most of the cases, utilize reception high frequency coil with the corresponding special use of difference of diagnosing the position with receiving with high frequency coil.
That is, in order to obtain image in high sensitivity, using high frequency coil as receiving, makes a video recording in the care zone that a plurality of surface coils (array coil) is configured in those who are investigated.For example, as the spinal column coil, as the spy open put down in writing in the flat 5-261081 communique, a kind of array coil that QD (Quadrature Detection, orthogonal detection) surface coils is arranged along the axon direction has been proposed.Here, the coil of the QD surface coils has been meant overlay configuration annular surface coil and 8 font surface coils is compared with the situation that does not have overlapping 8 font surface coils, can improve S/N.
On the other hand, when whole abdominal part is made a video recording, open the 2003-334177 communique puts down in writing, dispose a plurality of surface coils in mode usually around those who are investigated as the spy, and from whole abdominal part received signal.As this surface coils, use usually and arranged a plurality of toroidal array coils along body surface.
In addition, developing the combination that can change a plurality of coil parts (key element coil) in recent years and coming MRI device (for example, opening the 2006-141444 communique) that channel is distributed with reference to the spy.In such MRI device, come channel is distributed by the combination that changes coil part, can make sensitivity profile the most suitable at each position that will make a video recording.
But in the MRI device that the combination that can change a plurality of coil parts comes channel is distributed, the problem of existence is to need a lot of times and time in the inspection of isochronous reception with high frequency coil is installed.
That is, must make a video recording to whole coil part combinations, and check with data of collecting and image in employed position when checking each all coil parts and built-up coil element.Therefore, in the quantity of coil part for a long time, must carry out the inspections of tens thousand of kinds of combinations, in inspection, need a lot of times.
Summary of the invention
The magnetic resonance imaging apparatus of one aspect of the present invention has: applying unit applies leaning magnetic field and high-frequency impulse to tested the having a medical check-up of mounting in magnetostatic field; High frequency coil has detection in response to described leaning magnetic field and applying of described high-frequency impulse and from a plurality of key element coils of the magnetic resonance signal of the described tested radiation of having a medical check-up; Signal selecting circuit has the synthetic a plurality of integrated modes from the magnetic resonance signal of described a plurality of key element coils, will synthesize a plurality of signals from the magnetic resonance signal of described a plurality of key element coils according to this integrated mode; A plurality of receptors receive and handle the synthetic a plurality of signals of described signal selecting circuit respectively; Shooting sequence control part is used for switching a plurality of integrated modes in the execution of one or more shooting sequences, and collects magnetic resonance signal at each this integrated mode; And unusual determination portion, according to the magnetic resonance signal of described a plurality of integrated modes, determine integrated mode, key element coil, receptor, be used for carrying out any one unusual at least of described synthetic synthesizer.
In addition, the magnetic-resonance imaging maintenance device of another aspect of the present invention has: obtaining section, obtain the magnetic resonance signal of magnetic resonance imaging apparatus by each integrated mode of in the execution of a shooting sequence, switching a plurality of integrated modes and collecting, wherein, this magnetic resonance imaging apparatus has: signal selecting circuit, have synthetic synthetic a plurality of integrated modes, will synthesize a plurality of signals from the magnetic resonance signal of described a plurality of key element coils according to this integrated mode by the detected magnetic resonance signal of a plurality of key element coils; With a plurality of receptors, receive and handle the synthetic a plurality of signals of described signal selecting circuit respectively; And unusual determination portion, according to the magnetic resonance signal of each integrated mode that obtains by described obtaining section, determine integrated mode, key element coil, receptor, be used for carrying out described synthetic synthesizer any one unusual at least.
In addition, the magnetic-resonance imaging maintenance system of another aspect of the present invention has magnetic resonance imaging apparatus and magnetic-resonance imaging maintenance device, wherein, described magnetic resonance imaging apparatus has: applying unit applies leaning magnetic field and high-frequency impulse to tested the having a medical check-up of mounting in magnetostatic field; High frequency coil has detection in response to described leaning magnetic field and applying of described high-frequency impulse and from a plurality of key element coils of the magnetic resonance signal of the described tested radiation of having a medical check-up; Signal selecting circuit has the synthetic a plurality of integrated modes from the magnetic resonance signal of described a plurality of key element coils, will synthesize a plurality of signals from the magnetic resonance signal of described a plurality of key element coils according to this integrated mode; A plurality of receptors receive and handle the synthetic a plurality of signals of described signal selecting circuit respectively; And shooting sequence control part, be used for switching a plurality of integrated modes in the execution of one or more shooting sequences, collect magnetic resonance signal at each this integrated mode, described magnetic-resonance imaging maintenance device has: obtaining section, obtain the magnetic resonance signal of described magnetic resonance imaging apparatus by each integrated mode of switching a plurality of integrated modes and collecting; And unusual determination portion, according to the magnetic resonance signal of each integrated mode that obtains by described obtaining section, determine integrated mode, key element coil, receptor, be used for carrying out described synthetic synthesizer any one unusual at least.
In addition, the magnetic resonance imaging method of another aspect of the present invention comprises: magnetic resonance imaging apparatus switches a plurality of integrated modes in the execution of one or more shooting sequences, collect magnetic resonance signal at each this integrated mode, wherein, this magnetic resonance imaging apparatus has: signal selecting circuit, have synthetic synthetic a plurality of integrated modes, will synthesize a plurality of signals from the magnetic resonance signal of described a plurality of key element coils according to this integrated mode by the detected magnetic resonance signal of a plurality of key element coils; With a plurality of receptors, receive and handle the synthetic a plurality of signals of described signal selecting circuit respectively; According to the magnetic resonance signal of described a plurality of integrated modes, determine integrated mode, key element coil, receptor, be used for carrying out described synthetic synthesizer any one unusual at least.
Description of drawings
Fig. 1 is the key diagram that is used to illustrate the use of each channel reconstruction data.
Fig. 2 is the functional block diagram of formation of the MRI device of expression present embodiment.
Fig. 3 is the figure of formation of the MRI device relevant with the inspection of RF coil of expression present embodiment.
Fig. 4 is the figure of the coil part examples of combinations of expression coil part when being 4.
Fig. 5 is the key diagram of pulse train that is used to illustrate the MRI device of present embodiment.
Fig. 6 is the flow chart of the processing procedure handled of the inspection of the RF coil that carries out of MRI device of expression present embodiment.
Fig. 7 is used to illustrate the automatic gauged key diagram of collecting data.
Fig. 8 illustrates and the figure from the relevant function formation of dynamic(al) correction that collects data.
Fig. 9 is used to illustrate the key diagram of automatic generation to the alternative scheme of unusual coil part combination.
The specific embodiment
Explain the preferred embodiment of magnetic resonance imaging apparatus of the present invention, magnetic-resonance imaging maintenance device, magnetic-resonance imaging maintenance system and magnetic resonance imaging apparatus inspection method with reference to the accompanying drawings.
RF coil (high frequency coil) inspection technique of present embodiment at first, is described.In the RF of present embodiment coil inspection technique, use pulse train, to the combination of each echo (echo) specified line coil element and the distribution of channel, and under the situation of not carrying out phase code, carry out the shooting of RF coil inspection usefulness.
Then, as shown in Figure 1, by with each channel reconstruction data with compare by the pre-prepd reference data of same imaging conditions, carry out the inspection of each coil part combination, rather than the initial data of each channel of reconstruct synthesizes.
In addition, in shooting, use to have the required enough signals of the sensitivity that covers the RF coil and the model (phantom) of scope.In addition, the fixedly anchor clamps of RF coil and model are used stably in the shooting when collecting reference data in order correctly to reproduce.In addition, as the reference data, prepare in advance before the shipment with, when installing with, when checking with and the reference data used during fault etc.
As mentioned above, in the RF of present embodiment coil inspection technique, distribution to each echo specified line coil element combination and channel, do not carry out phase code but carry out the shooting of RF coil inspection usefulness, and, carry out the inspection of each coil part combination by each channel reconstruction data is compared with reference data.
Therefore, compare,, therefore can check the coil part combination efficiently, can carry out the inspection of a plurality of combinations of coil part at short notice because do not carry out phase code with the situation of utilizing common image to check.In addition,, therefore compare, can check the coil part combination efficiently with the situation that synthetic each channel reconstruction data are checked owing to utilize each channel reconstruction data to check.
The formation of the MRI device of present embodiment then, is described.Fig. 2 is the functional block diagram of formation of the MRI device of expression present embodiment.As shown in the drawing, this MRI device has the bed portion of carrying those who are investigated P; The magnetostatic field generating unit of magnetostatic field takes place; The leaning magnetic field generating unit that the magnetostatic field additional location information is used; Send the transmission acceptance division that receives high-frequency signal; And all control of responsible system and the control operational part of image reconstruction.
The magnetostatic field generating unit has the magnetostatic field magnet 1 of superconduct mode and supplies with the magnetostatic field power supply 2 of electric current to this magnetostatic field magnet 1, and the direction of principal axis (Z-direction) of the peristome cylindraceous (space use in diagnosis) that enters at those who are investigated P is gone up generation magnetostatic field H0.In addition, in this magnet portion, be provided with shim coil (not shown).The top board T that bed portion will be mounted with those who are investigated P in the mode that can advance and retreat is inserted into the peristome of magnetostatic field magnet 1.
The leaning magnetic field generating unit has the gradient magnetic field coil unit 3 that is combined in the magnetostatic field magnet 1.This gradient magnetic field coil unit 3 has 3 groups of (kind) x, y, the z coil 3x-3z of the leaning magnetic field that is used to take place mutually perpendicular X-direction, Y direction and Z-direction.The leaning magnetic field generating unit also has the leaning magnetic field power supply 4 of supplying with electric current to x, y, z coil 3x-3z.This leaning magnetic field power supply 4 is supplied with the pulse current that is used for run-off the straight magnetic field to x, y, z coil 3x-3z under the control of sequence controller 5 described later.
Supply to the pulse current of x, y, z coil 3x-3z from leaning magnetic field power supply 4 by control, can synthesize leaning magnetic field, thereby can at random set, change by mutually perpendicular slice direction leaning magnetic field GS, phase-encoding direction leaning magnetic field GE and read the logic direction of principal axis that direction (frequency coding direction) leaning magnetic field GR constitutes as 3 (X-axis, Y-axis, Z axle) directions of physical axis.Slice direction, phase-encoding direction and to read each leaning magnetic field and the magnetostatic field H0 of direction overlapping.
The transmission acceptance division has: be configured in the shooting space in magnetostatic field magnet 1 those who are investigated P near transmission with high frequency coil 7T with receive and use high frequency coil 7R; And the transmitter 8T and the receptor 8R that are connected with these high frequency coils 7T, 7R respectively.These transmitters 8T and receptor 8R move under the control of sequence controller 5 described later.By this action, the RF current impulse that transmitter 8T will be used for the Larmor frequency of excited nucleus magnetic resonance supplies to transmission high frequency coil 7T.Receptor 8R is taken into magnetic resonance (MR) signal (high-frequency signal) that receives with high frequency coil 7R by receiving, and after it being implemented various signal processing such as preposition amplification, intermediate frequency conversion, phase detection, low frequency amplification, filtering, carry out the A/D conversion, generate the numerical data (initial data) of MR signal.
And the control operational part has sequence controller (being also referred to as sequencer) 5, master computer 6, arithmetic element 10, memory element 11, display 12 and loader 13.Wherein, master computer 6 has following function: by institute's saved software flow process (not shown), to sequence controller 5 marker pulse sequence informations, supervise the action of whole device simultaneously.
In addition, arithmetic element 10 is via the numerical data of sequence controller 5 inputs by receptor 8R output, and in based on the k space (being also referred to as fourier space or frequency space) of its internal storage this numerical data of configuration, and be the view data of real space with this data reconstruction by carry out 2 dimensions or 3 dimension Fourier transforms at each group.In addition, arithmetic element 10 can also be carried out the synthetic processing or the calculus of differences processing of the data relevant with image as required.In this synthetic processing, comprise that processing, the maximum projection (MIP) of carrying out addition at each pixel handle etc.
Receive and use high frequency coil 7R in fact to be formed by a plurality of coil parts, the magnetic resonance signal that is received by each coil part is sent to receptor 8R respectively.Receptor 8R has 4 receive channels, and supplies with magnetic resonance signal from the coil part to the specified combination of each receive channel.Therefore, export the data of the digital quantity corresponding with magnetic resonance signal from each receive channel.
The data of being collected by this each receive channel send to arithmetic element 10 via sequence controller 5.The collection data that arithmetic element 10 reconstruct receive and the view data of rise time.In this reconstruct,, be reconstructed processing independently at each receive channel, and it synthesized an image by the square root calculation that carries out quadratic sum for from receiving the data of collecting with each coil part of high frequency coil 7R.
Then, the formation to the MRI device relevant with the inspection of RF coil of present embodiment describes.Fig. 3 is the figure of formation that the MRI device relevant with the inspection of RF coil of present embodiment is shown.As shown in the drawing, as present embodiment with the relevant formation of RF coil inspection, the MRI device has real-time system 100, host computer system 200, leaning magnetic field amplifier 310, RF amplifier 320, channel A331-channel D334, gradient magnetic field coil 410, RF coil 420 and stand (gantry) 430.
Real-time system 100 is to control the system of MRI device in real time, has real-time sequencer/delay controller 110, high frequency generator 120, RF controller 130 and leaning magnetic field controller 140.
In real time sequencer/delay controller 110 is control device of carrying out sequence control, and high frequency generator 120 is devices that the high frequency that applied by RF coil 420 takes place.RF controller 130 is devices of control channel A331-channel D334 and the MR signal that taken place to RF coil 420 input, and leaning magnetic field controller 140 is devices of the generation of control leaning magnetic field.
This real-time system 100 has shooting and controls function with sequence control function and the inspection of RF coil with sequence.Shooting is sequence control when the patient is photographed with sequence control, and the inspection of RF coil is sequence control when checking RF coil 420 with sequence control.In addition, the pulse train during for inspection RF coil 420 will be narrated in the back.
In addition, this real-time system 100 collect the MR signal of RF controllers 130 inputs and with it as initial data, via network collected initial data is sent to host computer system 200.
In addition, this host computer system 200 has the RF coil audit function of checking RF coil 420.That is, this host computer system 200 is when real-time system 100 receives the initial data of collecting for the inspection of RF coil 420, at the received initial data of each channel reconstruction, and checks RF coil 420 by comparing with reference data.
Leaning magnetic field amplifier 310 is that the leaning magnetic field control signal from real-time sequencer/delay controller 110 is amplified, and outputs to the amplifier of gradient magnetic field coil 410.RF amplifier 320 is to amplify the high frequency that high frequency generator 120 takes place according to the signal from real-time sequencer/delay controller 110, and outputs to the amplifier of RF coil 420.
Channel A331-channel D334 is the channel that is used for being imported to RF coil 420 by RF controller 130 the MR signal that is taken place.Each channel is used a plurality of coil part received signals of high frequency coil from the reception that constitutes RF coil 420.
Fig. 4 is the figure of the coil part examples of combinations of expression coil part when being 4.As shown in the drawing, constitute a reception high frequency coil by the coil part that makes up any number.And, come in a channel allocation coil part combination one at each echo by using pulse train.
Gradient magnetic field coil 410 is the coils in run-off the straight magnetic field, corresponding to gradient magnetic field coil unit 3 shown in Figure 2.RF coil 420 is used by transmission and the high frequency coil of reception usefulness constitutes, corresponding to transmission shown in Figure 2 high frequency coil 7T and reception high frequency coil 7R.That is, reception is made of a plurality of coil parts with high frequency coil 7R.
The pulse train of the MRI device of present embodiment then, is described.Fig. 5 is the key diagram of pulse train that is used to illustrate the MRI device of present embodiment.The MRI device of present embodiment utilizes the pulse train of echo of expression among Fig. 5 (once taking (shot)), apply the RF pulse, read, collect echo-signal then as the MR signal with leaning magnetic field pulse, selective exitation leaning magnetic field pulse and phase code leaning magnetic field pulse.
But the MRI device of present embodiment does not carry out phase code when carrying out the inspection of RF coil 420, but in switching coil pattern of the shown moment of the model selection of Fig. 5 (coil mode) and channel allocation.Here, coil modes is the combination of coil part, is also referred to as integrated mode.
As mentioned above, the MRI device of present embodiment is when carrying out the inspection of RF coil 420, do not carry out phase code, but by use pulse train at each echo in the moment of model selection switching coil elements combination and channel allocation, can be collected in the data that take place in the various combinations of coil part effectively.In addition, the moment of the model selection shown in Fig. 5 can be any time of pulse train.In addition, carry out the combination of coil part, and signal selecting circuit have a plurality of integrated modes by signal selecting circuit.In addition, if can use pulse train to change the combination of coil part and to the distribution of channel, the number of times of the sequence of then making a video recording can be made as 1 time and also can be made as repeatedly at each echo.
Then, the processing procedure that the inspection of the RF coil 420 that the MRI device of present embodiment carries out is handled is described.Fig. 6 is the flow chart of the processing procedure handled of the inspection of the RF coil 420 that carries out of MRI device of expression present embodiment.
As shown in the drawing, check in the processing at this, real-time system 100 uses pulse train to change the combination and the channel allocation of coil part at each echo, and collects data (step S1), then the data of collecting is sent to host computer system 200 (step S2) with coil modes.
Then, host computer system 200 is by relatively the data and the reference data of each coil modes are determined unusual coil modes, are unusual coil part combination.Specifically, select data (step S3), utilize dimension DFT, generate the reconstruct data (step S4) of plural number and absolute value.Then, calculate relevant (step S5) with reference data, and judge that correlation is whether than the threshold value little (step S6) of regulation about signal intensity.Be the threshold value hour of correlation in its result, be judged to be the coil modes corresponding unusual (step S7), when correlation is not less than the threshold value of regulation, be judged to be the coil modes corresponding normal (step S8) with these data with these data than regulation.
Then, host computer system 200 judges whether the processing of total data finishes (step S9), when the data of handling are arranged, turn back to step S3 and handle next data, and when the processing of total data finishes, the coil part combination (step S10) of display abnormality.
Like this, by with the correlation of each channel reconstruction data and reference data and the threshold of regulation, can determine unusual coil modes.In addition, owing to be relevant about signal intensity profile, therefore, can utilize based on relevant grade of the discrete correlation theorem of having used FFT and calculate here for the calculating of correlation.
In addition, calculated the correlation with reference data here, but also can compare to determine unusual coil modes, for example undertaken and relatively the waiting of reference data by intensity distributions being carried out threshold process with other method and reference data.In addition, also can utilize the threshold process of initial data rather than the threshold process of reconstruct data, determine unusual coil modes.In addition, also can show initial data and reconstruct data, and whether select normally by the user.
As mentioned above, in the present embodiment, when checking RF coil 420, real-time system 100 uses pulse trains to change the combination of coil part at each echo and to the distribution of channel, and collects data under the situation that does not apply phase code.Then, the correlation that host computer system 200 is calculated at the data and the reference data of each channel reconstruction, and under the situation of correlation, be judged as the anomaly association of coil part less than the threshold value of regulation.Therefore, can collect data, and whether judge normally, thereby can check RF coil 420 at short notice installing when waiting a plurality of coil part assembled highly-effectives ground.
In addition, in the present embodiment, illustrated under the situation of not carrying out phase code and collected data conditions, but also can carry out phase code, and carried out 2DFFT (DFT), and compared with reference data with the number of times that lacks than common shooting.By making the phase code number of times, can carry out abnormality detection to bigger space range for repeatedly.
In addition, in the present embodiment, illustrated by applying the situation that echo-signal takes place in the RF pulse, but the present invention is not limited to this, also can similarly be suitable under the situation of RF coil 420 checking by the analogue signal of using echo-signal.
In addition, in an embodiment, the situation of determining unusual coil part combination has been described, but also can have determined unusual coil part, unusual channel, anomalous signals selection circuit etc. according to the information of unusual coil part combination.For example, exist under the unusual situation, can determine that this coil part is for unusual in the data that only obtain from a coil part.In addition, have all the time when unusual, can determine that this channel is for unusual in the data that obtain from specific channel.In addition, the data under having made up the situation that does not have two unusual coil parts have when unusual, can determine that the signal selecting circuit that makes up two coil parts has unusually.
In addition, in the present embodiment, the situation of determining unusual coil part combination has been described, but except carrying out the determining of unusual coil part combination, under the situation such as can also be in unusual degree little, has automatically proofreaied and correct and collect data.Fig. 7 is used to illustrate the key diagram from dynamic(al) correction (level (level) correction) of collecting data.As shown in the drawing, collection data and reference data that host computer system 200 is relatively collected when the RF coil is checked are calculated corrected value.Then, the corrected value of the calculating information with the coil part combination is stored in the table, and utilize corrected value to proofread and correct during from data that the patient collects in reconstruct.
Specifically, as shown in Figure 8, in memory element 11, be provided with the checking list 111 that corrected value is stored with the information of coil part combination, and in arithmetic element 10, be provided with the corrected value of calculating corrected value and calculate portion 101 and utilize checking list 111 to carry out gauged correction unit 102 during from data that the patient collects in reconstruct.As mentioned above, by utilizing checking list 111 to proofread and correct during from data that the patient collects, can improve the precision of image in reconstruct.
In addition, in the present embodiment, the situation of determining unusual coil part combination has been described, but except determining unusual coil part combination, can also have generated alternative scheme automatically unusual coil part combination.Fig. 9 is used to illustrate the key diagram of automatic generation to the alternative scheme of unusual coil part combination.In the figure, for example have when unusual in any one of the coil part of secondary series combination, if do not use whole coil parts of secondary series, then the quality of image will significantly reduce.Therefore, host computer system 200 generates the alternative scheme that has changed the coil part combination automatically, and gives the user with this Notification of Changes.In addition, when generating alternative scheme, except the alternative scheme of same channel number, also generate the alternative scheme that has reduced the number of channel.Fig. 9 illustrates the situation that 5 channels is reduced to the alternative scheme of 4 channels that generated.
In addition, in the present embodiment, the situation of determining unusual coil part combination has been described, but can also have further determined to use the shooting plan of determined abnormal wire coil element combination, and when using determined shooting plan etc., shown warning.In addition, can also find out displaced shooting plan and demonstration.As mentioned above, not on the level of coil part combination but on the level of shooting plan, to show warning etc., thus, even general user also can tackle the unusual of coil part combination.In addition, can come to determine the shooting plan by storing the coil part combination that the shooting plan will be used accordingly with each shooting plan from unusual coil part combination.In addition, for the searching that replaces plan, also can store replacement accordingly and plan to carry out with each shooting plan.
In addition, in the present embodiment, the host computer system 200 that the MRI device has been described from real-time system 100 receive initial datas with the corresponding relevant information of coil part combination, determine the situation that unusual coil part makes up.But, the present invention is not limited to this, also go for following situation: host computer system 200 via networks such as LAN or WAN to be arranged on the remote maintenance device of maintenance centre etc. locating send initial data with the corresponding relevant information of coil part combination, the remote maintenance device determines that unusual coil part makes up.Via network gather information and definite unusual, can improve the level of maintenance service by the remote maintenance device.
In addition, in the present embodiment, the unusual situation of detection coil elements combination has been described, but also can have utilized collected data to detect the unusual of other.Signal that for example can be by spike (spike) shape is arranged in the initial data that detects whole channels, only in the initial data of a part of channel, have the needle pattern signal, the reading of data of institute's reconstruct constant noise etc. is arranged on the direction, determine channel and read unusual with leaning magnetic field etc.
Those of ordinary skill in the art can easily derive further effect and variation.Therefore, the embodiment of wider aspect of the present invention is not limited to the specific details and the representational embodiment that as above illustrate and put down in writing.Therefore, under the situation of the spirit or scope that do not break away from the generality inventive concept that limits by claim and equivalent technical solutions thereof, can carry out various changes.
Claims (25)
1. magnetic resonance imaging apparatus is characterized in that having:
Applying unit applies leaning magnetic field and high-frequency impulse to tested the having a medical check-up of mounting in magnetostatic field;
High frequency coil has detection in response to described leaning magnetic field and applying of described high-frequency impulse and from a plurality of key element coils of the magnetic resonance signal of the described tested radiation of having a medical check-up;
Signal selecting circuit has the synthetic a plurality of integrated modes from the magnetic resonance signal of described a plurality of key element coils, will synthesize a plurality of signals from the magnetic resonance signal of described a plurality of key element coils according to this integrated mode;
A plurality of receptors receive and handle the synthetic a plurality of signals of described signal selecting circuit respectively;
Shooting sequence control part is used for switching a plurality of integrated modes in the execution of one or more shooting sequences, and collects magnetic resonance signal at each this integrated mode; And
Unusual determination portion according to the magnetic resonance signal of described a plurality of integrated modes, is determined integrated mode, key element coil, receptor, is used for carrying out any one unusual at least of described synthetic synthesizer.
2. magnetic resonance imaging apparatus as claimed in claim 1 is characterized in that also having:
Corrected value is calculated portion, when having been determined integrated mode unusual by described unusual determination portion, calculates the corrected value at the magnetic resonance signal of having determined unusual integrated mode; And
Correction unit according to the corrected value of being calculated by the described corrected value portion of calculating, is proofreaied and correct by the detected magnetic resonance signal of described high frequency coil.
3. magnetic resonance imaging apparatus as claimed in claim 2 is characterized in that,
Described corrected value is calculated portion the corrected value of calculating is stored in the corrected value storage part with integrated mode,
Described correction unit is read corrected value from described corrected value storage part, proofreaies and correct by the detected magnetic resonance signal of described high frequency coil.
4. magnetic resonance imaging apparatus as claimed in claim 1 is characterized in that also having:
Replacement pattern generating unit comprises the situation that reduces the number of channel, generates the integrated mode that replaces having been determined by described unusual determination portion unusual integrated mode.
5. magnetic resonance imaging apparatus as claimed in claim 2 is characterized in that also having:
Replacement pattern generating unit comprises the situation that reduces the number of channel, generates the integrated mode that replaces having been determined by described unusual determination portion unusual integrated mode.
6. magnetic resonance imaging apparatus as claimed in claim 1 is characterized in that,
Described unusual determination portion is at the magnetic resonance signal of each channel reconstruction by being collected by described shooting sequence control part switching combining pattern, and will be somebody's turn to do at the magnetic resonance signal of each channel reconstruction respectively with reference to comparing, determine unusual integrated mode thus.
7. magnetic resonance imaging apparatus as claimed in claim 2 is characterized in that,
Described unusual determination portion is at the magnetic resonance signal of each channel reconstruction by being collected by described shooting sequence control part switching combining pattern, and will be somebody's turn to do at the magnetic resonance signal of each channel reconstruction respectively with reference to comparing, determine unusual integrated mode thus.
8. magnetic resonance imaging apparatus as claimed in claim 4 is characterized in that,
Described unusual determination portion is at the magnetic resonance signal of each channel reconstruction by being collected by described shooting sequence control part switching combining pattern, and will be somebody's turn to do at the magnetic resonance signal of each channel reconstruction respectively with reference to comparing, determine unusual integrated mode thus.
9. magnetic resonance imaging apparatus as claimed in claim 5 is characterized in that,
Described unusual determination portion is at the magnetic resonance signal of each channel reconstruction by being collected by described shooting sequence control part switching combining pattern, and will be somebody's turn to do at the magnetic resonance signal of each channel reconstruction respectively with reference to comparing, determine unusual integrated mode thus.
10. magnetic resonance imaging apparatus as claimed in claim 1 is characterized in that,
Also have the analogue signal generating unit, this analogue signal generating unit generates the analogue signal of analog magnetic resonance signal,
Described unusual determination portion is according to the analogue signal that described analogue signal generating unit generates, and determines integrated mode, key element coil, receptor, is used for carrying out any one unusual at least of described synthetic synthesizer.
11. magnetic resonance imaging apparatus as claimed in claim 2 is characterized in that,
Also have the analogue signal generating unit, this analogue signal generating unit generates the analogue signal of analog magnetic resonance signal,
Described unusual determination portion is according to the analogue signal that described analogue signal generating unit generates, and determines integrated mode, key element coil, receptor, is used for carrying out any one unusual at least of described synthetic synthesizer.
12. magnetic resonance imaging apparatus as claimed in claim 4 is characterized in that,
Also have the analogue signal generating unit, this analogue signal generating unit generates the analogue signal of analog magnetic resonance signal,
Described unusual determination portion is according to the analogue signal that described analogue signal generating unit generates, and determines integrated mode, key element coil, receptor, is used for carrying out any one unusual at least of described synthetic synthesizer.
13. magnetic resonance imaging apparatus as claimed in claim 5 is characterized in that,
Also have the analogue signal generating unit, this analogue signal generating unit generates the analogue signal of analog magnetic resonance signal,
Described unusual determination portion is according to the analogue signal that described analogue signal generating unit generates, and determines integrated mode, key element coil, receptor, is used for carrying out any one unusual at least of described synthetic synthesizer.
14. magnetic resonance imaging apparatus as claimed in claim 6 is characterized in that,
Also have the analogue signal generating unit, this analogue signal generating unit generates the analogue signal of analog magnetic resonance signal,
Described unusual determination portion is according to the analogue signal that described analogue signal generating unit generates, and determines integrated mode, key element coil, receptor, is used for carrying out any one unusual at least of described synthetic synthesizer.
15. magnetic resonance imaging apparatus as claimed in claim 7 is characterized in that,
Also have the analogue signal generating unit, this analogue signal generating unit generates the analogue signal of analog magnetic resonance signal,
Described unusual determination portion is according to the analogue signal that described analogue signal generating unit generates, and determines integrated mode, key element coil, receptor, is used for carrying out any one unusual at least of described synthetic synthesizer.
16. magnetic resonance imaging apparatus as claimed in claim 8 is characterized in that,
Also have the analogue signal generating unit, this analogue signal generating unit generates the analogue signal of analog magnetic resonance signal,
Described unusual determination portion is according to the analogue signal that described analogue signal generating unit generates, and determines integrated mode, key element coil, receptor, is used for carrying out any one unusual at least of described synthetic synthesizer.
17. magnetic resonance imaging apparatus as claimed in claim 1 is characterized in that, also has:
Unusual shooting plan determination portion determines to use the shooting plan of the unusual integrated mode of being determined by described unusual determination portion; And
The warning efferent is at the shooting plan output warning of being determined by described unusual shooting plan determination portion.
18. magnetic resonance imaging apparatus as claimed in claim 2 is characterized in that, also has:
Unusual shooting plan determination portion determines to use the shooting plan of the unusual integrated mode of being determined by described unusual determination portion; And
The warning efferent is at the shooting plan output warning of being determined by described unusual shooting plan determination portion.
19. magnetic resonance imaging apparatus as claimed in claim 4 is characterized in that, also has:
Unusual shooting plan determination portion determines to use the shooting plan of the unusual integrated mode of being determined by described unusual determination portion; And
The warning efferent is at the shooting plan output warning of being determined by described unusual shooting plan determination portion.
20. magnetic resonance imaging apparatus as claimed in claim 6 is characterized in that, also has:
Unusual shooting plan determination portion determines to use the shooting plan of the unusual integrated mode of being determined by described unusual determination portion; And
The warning efferent is at the shooting plan output warning of being determined by described unusual shooting plan determination portion.
21. magnetic resonance imaging apparatus as claimed in claim 9 is characterized in that, also has:
Unusual shooting plan determination portion determines to use the shooting plan of the unusual integrated mode of being determined by described unusual determination portion; And
The warning efferent is at the shooting plan output warning of being determined by described unusual shooting plan determination portion.
22. magnetic resonance imaging apparatus as claimed in claim 17 is characterized in that,
Also have replacement plan generating unit, this replacement plan generating unit generates the replacement plan of having been exported the shooting plan of warning by described warning efferent.
23. a magnetic-resonance imaging maintenance device is characterized in that having:
Obtaining section, obtain the magnetic resonance signal of magnetic resonance imaging apparatus by each integrated mode of in the execution of a shooting sequence, switching a plurality of integrated modes and collecting, wherein, this magnetic resonance imaging apparatus has: signal selecting circuit, have synthetic synthetic a plurality of integrated modes, will synthesize a plurality of signals from the magnetic resonance signal of described a plurality of key element coils according to this integrated mode by the detected magnetic resonance signal of a plurality of key element coils; With a plurality of receptors, receive and handle the synthetic a plurality of signals of described signal selecting circuit respectively; And
Unusual determination portion according to the magnetic resonance signal of each integrated mode that is obtained by described obtaining section, is determined integrated mode, key element coil, receptor, is used for carrying out described synthetic synthesizer any one unusual at least.
24. a magnetic-resonance imaging maintenance system is characterized in that, has magnetic resonance imaging apparatus and magnetic-resonance imaging maintenance device, wherein,
Described magnetic resonance imaging apparatus has:
Applying unit applies leaning magnetic field and high-frequency impulse to tested the having a medical check-up of mounting in magnetostatic field;
High frequency coil has detection in response to described leaning magnetic field and applying of described high-frequency impulse and from a plurality of key element coils of the magnetic resonance signal of the described tested radiation of having a medical check-up;
Signal selecting circuit has the synthetic a plurality of integrated modes from the magnetic resonance signal of described a plurality of key element coils, will synthesize a plurality of signals from the magnetic resonance signal of described a plurality of key element coils according to this integrated mode;
A plurality of receptors receive and handle the synthetic a plurality of signals of described signal selecting circuit respectively; And
Shooting sequence control part is used for switching a plurality of integrated modes in the execution of one or more shooting sequences, collects magnetic resonance signal at each this integrated mode,
Described magnetic-resonance imaging maintenance device has:
Obtaining section obtains the magnetic resonance signal of described magnetic resonance imaging apparatus by each integrated mode of switching a plurality of integrated modes and collecting; And
Unusual determination portion according to the magnetic resonance signal of each integrated mode that is obtained by described obtaining section, is determined integrated mode, key element coil, receptor, is used for carrying out described synthetic synthesizer any one unusual at least.
25. a magnetic resonance imaging method is characterized in that, comprising:
Magnetic resonance imaging apparatus switches a plurality of integrated modes in the execution of one or more shooting sequences, collect magnetic resonance signal at each this integrated mode, wherein, this magnetic resonance imaging apparatus has: signal selecting circuit, have synthetic synthetic a plurality of integrated modes, will synthesize a plurality of signals from the magnetic resonance signal of described a plurality of key element coils according to this integrated mode by the detected magnetic resonance signal of a plurality of key element coils; With a plurality of receptors, receive and handle the synthetic a plurality of signals of described signal selecting circuit respectively;
According to the magnetic resonance signal of described a plurality of integrated modes, determine integrated mode, key element coil, receptor, be used for carrying out described synthetic synthesizer any one unusual at least.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007071280 | 2007-03-19 | ||
| JP2007-071280 | 2007-03-19 | ||
| JP2007334382A JP5086796B2 (en) | 2007-03-19 | 2007-12-26 | Magnetic resonance imaging apparatus, magnetic resonance imaging maintenance apparatus, magnetic resonance imaging maintenance system, and magnetic resonance imaging apparatus inspection method |
| JP2007-334382 | 2007-12-26 |
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| Publication Number | Publication Date |
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| CN101268943A CN101268943A (en) | 2008-09-24 |
| CN101268943B true CN101268943B (en) | 2011-11-16 |
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| CN2008100871238A Expired - Fee Related CN101268943B (en) | 2007-03-19 | 2008-03-19 | Magnetic resonance imaging apparatus and method, magnetic-resonance imaging maintenance apparatus and system |
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| CN (1) | CN101268943B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5498339B2 (en) | 2009-11-05 | 2014-05-21 | 株式会社東芝 | Magnetic resonance imaging system |
| KR101767213B1 (en) * | 2011-09-15 | 2017-08-11 | 삼성전자주식회사 | Method for controlling magnetic resonance imaging system and apparatus therefor |
| JP6084420B2 (en) * | 2012-10-02 | 2017-02-22 | 株式会社日立製作所 | Multi-channel image synthesis method and magnetic resonance imaging apparatus |
| CN104515961B (en) * | 2013-09-30 | 2018-02-13 | 西门子(深圳)磁共振有限公司 | MR imaging method and device |
| CN105874345B (en) * | 2014-01-03 | 2020-06-23 | 皇家飞利浦有限公司 | Calculation of probability of gradient coil amplifier failure using environmental data |
| JP6338877B2 (en) * | 2014-02-12 | 2018-06-06 | キヤノンメディカルシステムズ株式会社 | Magnetic resonance imaging system |
| JP6489744B2 (en) * | 2014-02-28 | 2019-03-27 | ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー | Magnetic resonance apparatus and program |
| CN104921725A (en) * | 2014-03-18 | 2015-09-23 | 上海联影医疗科技有限公司 | Method and device for detecting working condition of radio frequency coil |
| JP6407552B2 (en) * | 2014-04-15 | 2018-10-17 | キヤノンメディカルシステムズ株式会社 | Magnetic resonance imaging system |
| CN109541511B (en) * | 2018-11-26 | 2020-02-14 | 清华大学 | Temperature rise prediction method and device |
| CN115081471B (en) * | 2022-05-13 | 2023-05-30 | 浙江大学 | Peak potential detection and classification method based on multi-band composite waveform and application |
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| JPH01293865A (en) * | 1988-05-24 | 1989-11-27 | Toshiba Corp | Magnetic resonance imaging apparatus |
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| US6377044B1 (en) * | 2000-03-01 | 2002-04-23 | Philips Medical Systems(Cleveland), Inc. | Multi-mode receiver coils for MRI |
| US6972565B2 (en) * | 2001-12-27 | 2005-12-06 | Kabushiki Kaisha Toshiba | System, method and apparatus for MRI maintenance and support |
| CN1821804A (en) * | 2005-02-15 | 2006-08-23 | 株式会社东芝 | Magnetic resonance imaging apparatus and its control method |
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| JP2008259814A (en) | 2008-10-30 |
| CN101268943A (en) | 2008-09-24 |
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