WO2009118702A3 - Flip angle imaging with improved b1 mapping for multi-rf transmit systems - Google Patents

Flip angle imaging with improved b1 mapping for multi-rf transmit systems Download PDF

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Publication number
WO2009118702A3
WO2009118702A3 PCT/IB2009/051258 IB2009051258W WO2009118702A3 WO 2009118702 A3 WO2009118702 A3 WO 2009118702A3 IB 2009051258 W IB2009051258 W IB 2009051258W WO 2009118702 A3 WO2009118702 A3 WO 2009118702A3
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic resonance
radio frequency
frequency transmit
flip angle
mapping
Prior art date
Application number
PCT/IB2009/051258
Other languages
French (fr)
Other versions
WO2009118702A2 (en
Inventor
Kay Nehrke
Peter Boernert
Tobias Ratko Voigt
Ulrich Katscher
Original Assignee
Koninklijke Philips Electronics N.V.
Philips Intellectual Property & Standards Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics N.V., Philips Intellectual Property & Standards Gmbh filed Critical Koninklijke Philips Electronics N.V.
Priority to EP09725991A priority Critical patent/EP2260317A2/en
Priority to US12/933,897 priority patent/US8698495B2/en
Priority to CN200980110909.XA priority patent/CN101981462B/en
Publication of WO2009118702A2 publication Critical patent/WO2009118702A2/en
Publication of WO2009118702A3 publication Critical patent/WO2009118702A3/en

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Classifications

    • 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
    • G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
    • G01R33/48—NMR imaging systems
    • G01R33/58—Calibration of imaging systems, e.g. using test probes, Phantoms; Calibration objects or fiducial markers such as active or passive RF coils surrounding an MR active material
    • G01R33/583—Calibration of signal excitation or detection systems, e.g. for optimal RF excitation power or frequency
    • G01R33/586—Calibration of signal excitation or detection systems, e.g. for optimal RF excitation power or frequency for optimal flip angle of RF pulses
    • 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
    • G01R33/24—Arrangements or instruments for measuring magnetic variables involving magnetic resonance for measuring direction or magnitude of magnetic fields or magnetic flux
    • G01R33/246—Spatial mapping of the RF magnetic field B1
    • 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
    • G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
    • G01R33/341—Constructional details, e.g. resonators, specially adapted to MR comprising surface coils
    • G01R33/3415—Constructional details, e.g. resonators, specially adapted to MR comprising surface coils comprising arrays of sub-coils, i.e. phased-array coils with flexible receiver channels
    • 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
    • G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
    • G01R33/48—NMR imaging systems
    • G01R33/54—Signal processing systems, e.g. using pulse sequences ; Generation or control of pulse sequences; Operator console
    • G01R33/56—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution
    • G01R33/561—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution by reduction of the scanning time, i.e. fast acquiring systems, e.g. using echo-planar pulse sequences
    • G01R33/5611—Parallel magnetic resonance imaging, e.g. sensitivity encoding [SENSE], simultaneous acquisition of spatial harmonics [SMASH], unaliasing by Fourier encoding of the overlaps using the temporal dimension [UNFOLD], k-t-broad-use linear acquisition speed-up technique [k-t-BLAST], k-t-SENSE
    • G01R33/5612—Parallel RF transmission, i.e. RF pulse transmission using a plurality of independent transmission channels
    • 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
    • G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
    • G01R33/48—NMR imaging systems
    • G01R33/54—Signal processing systems, e.g. using pulse sequences ; Generation or control of pulse sequences; Operator console
    • G01R33/56—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution
    • G01R33/565—Correction of image distortions, e.g. due to magnetic field inhomogeneities
    • G01R33/5659—Correction of image distortions, e.g. due to magnetic field inhomogeneities caused by a distortion of the RF magnetic field, e.g. spatial inhomogeneities of the RF magnetic field
    • 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
    • G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
    • G01R33/48—NMR imaging systems
    • G01R33/54—Signal processing systems, e.g. using pulse sequences ; Generation or control of pulse sequences; Operator console
    • G01R33/56—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution
    • G01R33/565—Correction of image distortions, e.g. due to magnetic field inhomogeneities
    • G01R33/56518—Correction of image distortions, e.g. due to magnetic field inhomogeneities due to eddy currents, e.g. caused by switching of the gradient magnetic field

Abstract

A magnetic resonance method includes performing a plurality of magnetic resonance excitation operations each using a different sub-set of a set of radio frequency transmit coils (30), each sub-set including more than one radio frequency transmit coil, acquiring magnetic resonance data responsive to each said magnetic resonance excitation operation, and computing a B1 or flip angle map for each radio frequency transmit coil of the set of radio frequency transmit coils based on the acquired magnetic resonance data. A magnetic resonance method includes performing an actual flip angle mapping (AFI) sequence using a radio frequency transmit coil (32) with a ratio TR1 : TR2 of the TR times of the AFI sequence selected to be rational, acquiring magnetic resonance data responsive to said AFI sequence, and computing a B1 or flip angle map for the radio frequency transmit coil based on the acquired magnetic resonance data.
PCT/IB2009/051258 2008-03-27 2009-03-26 Flip angle imaging with improved b1 mapping for multi-rf transmit systems WO2009118702A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP09725991A EP2260317A2 (en) 2008-03-27 2009-03-26 Flip angle imaging with improved b1 mapping for multi-rf transmit systems
US12/933,897 US8698495B2 (en) 2008-03-27 2009-03-26 Flip angle imaging with improved B1 mapping for multi-RF transmit systems
CN200980110909.XA CN101981462B (en) 2008-03-27 2009-03-26 Flip angle imaging with improved B1 mapping for multi-RF transmit systems

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP08153373.9 2008-03-27
EP08153373 2008-03-27

Publications (2)

Publication Number Publication Date
WO2009118702A2 WO2009118702A2 (en) 2009-10-01
WO2009118702A3 true WO2009118702A3 (en) 2010-01-07

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2009/051258 WO2009118702A2 (en) 2008-03-27 2009-03-26 Flip angle imaging with improved b1 mapping for multi-rf transmit systems

Country Status (4)

Country Link
US (1) US8698495B2 (en)
EP (1) EP2260317A2 (en)
CN (1) CN101981462B (en)
WO (1) WO2009118702A2 (en)

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JP5523564B2 (en) * 2010-06-09 2014-06-18 株式会社日立メディコ Magnetic resonance imaging apparatus and transmission sensitivity distribution calculation method
RU2582474C2 (en) 2010-08-20 2016-04-27 Конинклейке Филипс Электроникс Н.В. Virtual coil emulation in parallel transmission mri
DE102011005111B4 (en) * 2011-03-04 2013-08-22 Siemens Aktiengesellschaft Operating method for a local coil with optimized data transmission
WO2012138902A1 (en) * 2011-04-08 2012-10-11 The United States Of America As Represented By The Secretary, Department Of Health & Human Services B0-based modulation of b1 excitation in mri
US8558547B2 (en) 2011-05-05 2013-10-15 General Electric Company System and method for magnetic resonance radio-frequency field mapping
US9488705B2 (en) * 2011-07-20 2016-11-08 Koninklijke Philips N.V. Wireless local transmit coils and array with controllable load
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WO2013069513A1 (en) * 2011-11-08 2013-05-16 株式会社 日立メディコ Magnetic resonance imaging device and irradiation magnetic field distribution measurement method
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DE102012203452B4 (en) * 2012-03-05 2019-01-03 Siemens Healthcare Gmbh Output of high frequency pulses in a magnetic resonance imaging system
US9091628B2 (en) 2012-12-21 2015-07-28 L-3 Communications Security And Detection Systems, Inc. 3D mapping with two orthogonal imaging views
US10261150B2 (en) * 2013-02-12 2019-04-16 Hitachi, Ltd. Magnetic resonance imaging apparatus and processing method
KR101458557B1 (en) 2013-02-20 2014-11-07 삼성전자주식회사 The method and apparatus for obtaining main magnetic field information and radio pulse related information in magnetic resonance system with different flip angles
JP2016512143A (en) 2013-03-15 2016-04-25 オハイオ・ステイト・イノベーション・ファウンデーション Method and apparatus for signal non-uniformity correction and performance evaluation
KR20150092790A (en) 2014-02-05 2015-08-17 가천대학교 산학협력단 Magnetic Resonance Imaging Method using T2* Mapping Based on Echo Planar Imaging
CN104856676B (en) * 2014-02-26 2017-10-03 西门子(深圳)磁共振有限公司 MR imaging method and device
KR101730223B1 (en) * 2014-10-27 2017-04-25 삼성전기주식회사 Apparatus and method for receiving wireless power, and wireless power supply system using the same
US9837864B2 (en) * 2015-03-26 2017-12-05 Integrated Device Technology, Inc. Apparatuses and wireless power transmitters having multiple transmit coils and related method
US11047935B2 (en) 2015-05-14 2021-06-29 Ohio State Innovation Foundation Systems and methods for estimating complex B1+ fields of transmit coils of a magnetic resonance imaging (MRI) system
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WO2018050777A1 (en) 2016-09-14 2018-03-22 Institut National De La Sante Et De La Recherche Medicale (Inserm) A method for characterizing the radio-frequency transmit field in nmr
WO2018096006A1 (en) * 2016-11-28 2018-05-31 Koninklijke Philips N.V. Image quality control in dynamic contrast enhanced magnetic resonance imaging
US10890631B2 (en) 2017-01-19 2021-01-12 Ohio State Innovation Foundation Estimating absolute phase of radio frequency fields of transmit and receive coils in a magnetic resonance
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Also Published As

Publication number Publication date
CN101981462A (en) 2011-02-23
US8698495B2 (en) 2014-04-15
CN101981462B (en) 2014-12-24
WO2009118702A2 (en) 2009-10-01
EP2260317A2 (en) 2010-12-15
US20110026799A1 (en) 2011-02-03

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