JP2005152655A - Mrデータ収集中のrf電力蓄積を低減する方法及び装置 - Google Patents
Mrデータ収集中のrf電力蓄積を低減する方法及び装置 Download PDFInfo
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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
- G01R33/44—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
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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
- G01R33/34—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
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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
- G01R33/44—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
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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
- G01R33/288—Provisions within MR facilities for enhancing safety during MR, e.g. reduction of the specific absorption rate [SAR], detection of ferromagnetic objects in the scanner room
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Abstract
【解決手段】 対応するRFパルス合成器及び増幅器(74)を有する複数の送信コイル(70、72)からなるシステム(10)が開示される。また、イメージングボリュームにわたるRF電力蓄積を動的に制御するための各送信コイル(72)への特定のRFパルスを設計する方法も開示され、送信コイル(72)による並列励起が、望ましい励起プロフィールの正確な生成を容易としながら、被検体へのRF電力蓄積の管理を可能にする。本発明はまた、走査時間の短縮に対応し、且つ任意のコイルアレイ幾何形状に適用可能である。
【選択図】 図2
Description
B=∇×A
及び
E=−dA/dt
に関連する。この場合、式12の|E(x,pΔt)|2の項は、次式で評価することができ、
72 送信コイル
74 RF増幅器
76 励起ボリューム
78 被検体
Claims (10)
- コンピュータ可読記憶媒体(26、28、30)であって、該媒体上に格納され、コンピュータ(12、24、22、32、36)によって実行されたときに該コンピュータに、
送信コイルアレイ(70)の各送信コイルについてB1磁場マップを収集し、
前記B1磁場マップからコンポジットB1磁場の時間空間的変動を求め、
MRイメージング中のRF電力蓄積が低減されるようにそれぞれの送信コイル(72)に合わせたRFパルスシーケンスを発生する、
ように行わせる命令セットを表すコンピュータプログラムを有するコンピュータ可読記憶媒体(26、28、30)。 - 前記命令セットが更に、前記コンピュータ(12、24、22、32、36)に、望ましい励起プロフィールから前記送信コイルアレイによって生成されるRF励起プロフィールの実質的な偏差を生じることなく、イメージングボリュームにわたるRF電力蓄積を最小化させることを特徴とする請求項1に記載のコンピュータ可読記憶媒体(26、28、30)。
- 前記命令セットが、前記コンピュータ(12、24、22、32、36)にRF電力蓄積を最小化させ、任意の送信コイルアレイ幾何形状(70、72)に適用で可能な原理を具現化することを特徴とする請求項1に記載のコンピュータ可読記憶媒体(26、28、30)。
- 前記命令セットが、前記コンピュータ(12、24、22、32、36)に前記送信コイル(70、72)の少なくとも有効B1磁場に基づく送信コイル(70)のためのRFパルス方式を決定させ、各有効B1磁場が送信コイル(70)と少なくとも1つの別の送信コイル(72)との相互結合を反映することを特徴とする請求項1に記載のコンピュータ可読記憶媒体(26、28、30)。
- 前記命令セットは更に、前記コンピュータ(12、24、22、32、36)に、前記送信コイル(70)を用いる並列RF励起が望ましい励起プロフィールに一致する結果を生成するように各パルスシーケンスを設計させることを特徴とする請求項1に記載のコンピュータ可読記憶媒体(26、28、30)。
- 前記命令セットが更に、前記コンピュータ(12、24、22、32、36)に、2D又は3DのMRデータを収集させることを特徴とする請求項1に記載のコンピュータ可読記憶媒体(26、28、30)。
- 前記送信コイルアレイ(70)が、直線状に配置された複数の送信コイル(72)を含むことを特徴とする請求項1に記載のコンピュータ可読記憶媒体(26、28、30)。
- 各送信コイル(72)が、専用のRF増幅器(74)によって駆動されることを特徴とする請求項7に記載のコンピュータ可読記憶媒体(26、28、30)。
- 前記命令セットが更に、前記コンピュータ(12、24、22、32、36)に、前記送信コイル(72)の独立制御によってMRイメージング中の被検体へのRF電力蓄積を調整させることを特徴とする請求項1に記載のコンピュータ可読記憶媒体(26、28、30)。
- 前記命令セットが更に、前記コンピュータ(12、24、22、32、36)に、望ましい励起プロフィールに一致するRF励起と被検体へのSAR低減とを同時に達成させることを特徴とする請求項1に記載のコンピュータ可読記憶媒体(26、28、30)。
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US10/723,311 | 2003-11-26 | ||
US10/723,311 US6989673B2 (en) | 2003-11-26 | 2003-11-26 | Method and apparatus to reduce RF power deposition during MR data acquisition |
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JP2005152655A true JP2005152655A (ja) | 2005-06-16 |
JP2005152655A5 JP2005152655A5 (ja) | 2008-01-17 |
JP4897212B2 JP4897212B2 (ja) | 2012-03-14 |
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DE (1) | DE102004057310A1 (ja) |
NL (1) | NL1027583C2 (ja) |
Cited By (9)
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US7075301B2 (en) | 2006-07-11 |
US20050134267A1 (en) | 2005-06-23 |
US20050110487A1 (en) | 2005-05-26 |
US6989673B2 (en) | 2006-01-24 |
DE102004057310A1 (de) | 2005-07-21 |
NL1027583C2 (nl) | 2007-11-27 |
NL1027583A1 (nl) | 2005-05-27 |
JP4897212B2 (ja) | 2012-03-14 |
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