JP5260819B2 - 並列式mriを用いた撮像を高速化させるための方法及びシステム - Google Patents
並列式mriを用いた撮像を高速化させるための方法及びシステム Download PDFInfo
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- JP5260819B2 JP5260819B2 JP2004096425A JP2004096425A JP5260819B2 JP 5260819 B2 JP5260819 B2 JP 5260819B2 JP 2004096425 A JP2004096425 A JP 2004096425A JP 2004096425 A JP2004096425 A JP 2004096425A JP 5260819 B2 JP5260819 B2 JP 5260819B2
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- 238000003384 imaging method Methods 0.000 title claims description 56
- 238000000034 method Methods 0.000 title claims description 31
- 238000002595 magnetic resonance imaging Methods 0.000 claims description 25
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 claims description 11
- 238000004904 shortening Methods 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 description 10
- 230000008901 benefit Effects 0.000 description 4
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- 230000008569 process Effects 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
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- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002572 peristaltic effect Effects 0.000 description 2
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000012307 MRI technique Methods 0.000 description 1
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- 230000015572 biosynthetic process Effects 0.000 description 1
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- 229910052802 copper Inorganic materials 0.000 description 1
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- 238000006731 degradation reaction Methods 0.000 description 1
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- 230000014509 gene expression Effects 0.000 description 1
- 238000011503 in vivo imaging Methods 0.000 description 1
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Images
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
- G01R33/28—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
Description
Pruessmannら、Magnetic Resonance in Medicine、第42巻、1999年、952〜962頁
110 コンピュータ
120 パルス制御モジュール
130 傾斜コイル・パワー増幅器
140 MRマグネット・アセンブリ
141 シム用コイル電源
143 シム用コイル・アセンブリ
145 傾斜コイル
147 RF送信コイル
170 RF送受信器システム
171 前置増幅器
173 4相位相検出器、位相感応性検出器
175 A/D変換器
178 無線周波数(RF)合成器
179 RF変調器
180 RFパワー増幅器
190 RF受信器アレイ
191 RF受信器コイル
192 検出器素子
193 検出器素子
194 前置増幅器
195 前置増幅器
196 位相感応性検出器
197 位相感応性検出器
198 A/D変換器
199 A/D変換器
200 被検体
201 受信器素子
202 前置増幅器
203 位相感応性検出器
204 A/D変換器
210 受信器素子
220 前側サブアセンブリ
230 後側サブアセンブリ
Claims (10)
- 磁気共鳴イメージング(MRI)システム(100)を用いた並列イメージングの方法であって、
MRIシステム内で被検体(200)の周りに配置させている横列の形に配列させた複数の受信器素子(191、192、193、201)を有する受信器コイルアレイ(190)から複数の磁気共鳴(MR)信号を収集する工程と、
前記アレイの各横列ごとに受信器周波数をある選択可能な量だけ周波数エンコード方向にシフトさせることにより、撮像域(FOV)を周波数エンコード方向にシフトさせる工程と、
前記アレイの各横列ごとに収集したMR信号から複数のサブ画像を作成する工程と、
前記複数のサブ画像の各々を画像収集中におけるFOVのシフトと同じ量だけシフトさせる工程と、
シフトさせた複数の前記サブ画像を合成する工程と、
を含む方法。 - 前記選択可能量が、各横列ごとに可変であると共に、各FOVが受信器素子の対応する横列の直ぐ下に位置決めされるように設定されている、請求項1に記載の方法。
- 位相エンコード方向における撮像域の任意の短縮に起因する位相エンコード方向でのエイリアシングを位相アンラップさせるような位相アンラップ工程をさらに含む請求項2に記載の方法。
- 前記サブ画像を合成する工程が、
前記サブ画像の重なった領域において2乗和の平方根を求めることを含む請求項1乃至3のいずれかに記載の方法。 - 前記MR信号を収集する工程が、SENSE法又はSMASH法に基づいて収集され、
前記受信器コイルアレイ(190)が8乃至32の受信器素子を有する、請求項1乃至4のいずれかに記載の方法。 - 磁気共鳴イメージング(MRI)を用いた並列イメージングのためのシステムであって、
磁気共鳴(MR)信号の収集に使用するために撮像対象の関心領域の周りに位置決めさせている、アレイを形成するように横列の形に配列させた複数の受信器素子(191、192、193、201)を有する少なくとも1つの受信器コイルアレイ・アセンブリ(190)と、
選択したパルスシーケンスを印加するためのパルス制御モジュール(120)と、
前記受信器素子の各々から複数のMR信号を収集するための画像処理装置(110)であって、さらに、それぞれの受信器周波数を前記アレイの横列ごとにある選択可能な量だけ選択した周波数エンコード方向にシフトさせることにより撮像域(FOV)を周波数エンコード方向にシフトさせるように構成されている画像処理装置(110)と、
を備え、
前記画像処理装置(110)がさらに、
前記アレイの各横列ごとに収集したMR信号から複数のサブ画像を作成し、
前記複数のサブ画像の各々を画像収集中におけるFOVのシフトと同じ量だけシフトさせ、
シフトさせた複数の前記サブ画像を合成するように構成されているシステム。 - 前記画像処理装置(110)が、位相エンコード方向での撮像域の短縮に起因する位相エンコード方向でのエイリアシングを位相アンラップさせるように構成されている、請求項6に記載のシステム。
- 前記画像処理装置(110)が、
前記サブ画像の重なった領域において2乗和の平方根を求めることを含んだ合成工程を実行するように構成されている、請求項6又は7に記載のシステム。 - 前記受信器コイルアレイ(190)が、撮像中に関心領域と隣接して配置させるように適応させているような、その各々がMR信号を収集するように横列の形に配列させた複数の受信器素子を備えている前側サブアセンブリ及び後側サブアセンブリを備えている、請求項6乃至8のいずれかに記載のシステム。
- 前記パルス制御モジュール(120)が、SENSE法又はSMASH法に基づいたパルスシーケンスを印加し、
前記受信器コイルアレイ(190)が8乃至32の受信器素子を有する、請求項6乃至9のいずれかに記載のシステム。
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US10/452,095 US6876199B2 (en) | 2003-05-30 | 2003-05-30 | Method and system for accelerated imaging using parallel MRI |
US10/452,095 | 2003-05-30 |
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JP2004358221A JP2004358221A (ja) | 2004-12-24 |
JP5260819B2 true JP5260819B2 (ja) | 2013-08-14 |
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US (1) | US6876199B2 (ja) |
JP (1) | JP5260819B2 (ja) |
CN (1) | CN100482156C (ja) |
DE (1) | DE102004015796B4 (ja) |
NL (1) | NL1026270C2 (ja) |
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2004
- 2004-03-29 CN CNB2004100314043A patent/CN100482156C/zh not_active Expired - Fee Related
- 2004-03-29 JP JP2004096425A patent/JP5260819B2/ja not_active Expired - Lifetime
- 2004-03-29 DE DE102004015796A patent/DE102004015796B4/de not_active Expired - Fee Related
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US6876199B2 (en) | 2005-04-05 |
NL1026270C2 (nl) | 2005-12-23 |
DE102004015796A1 (de) | 2004-12-16 |
CN1572242A (zh) | 2005-02-02 |
DE102004015796B4 (de) | 2013-08-14 |
NL1026270A1 (nl) | 2004-12-01 |
US20040239324A1 (en) | 2004-12-02 |
CN100482156C (zh) | 2009-04-29 |
JP2004358221A (ja) | 2004-12-24 |
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