JP2007534354A - 脂肪抑制を用いる血管の等方性画像形成 - Google Patents
脂肪抑制を用いる血管の等方性画像形成 Download PDFInfo
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- JP2007534354A JP2007534354A JP2006533572A JP2006533572A JP2007534354A JP 2007534354 A JP2007534354 A JP 2007534354A JP 2006533572 A JP2006533572 A JP 2006533572A JP 2006533572 A JP2006533572 A JP 2006533572A JP 2007534354 A JP2007534354 A JP 2007534354A
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- 238000003384 imaging method Methods 0.000 title description 4
- 230000001629 suppression Effects 0.000 title description 2
- 210000004204 blood vessel Anatomy 0.000 title 1
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 claims abstract description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims description 59
- 238000005070 sampling Methods 0.000 claims description 28
- 230000008569 process Effects 0.000 claims description 19
- 238000002595 magnetic resonance imaging Methods 0.000 claims description 12
- 230000005284 excitation Effects 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 230000001351 cycling effect Effects 0.000 abstract description 3
- 238000005481 NMR spectroscopy Methods 0.000 description 26
- 230000005415 magnetization Effects 0.000 description 7
- 238000012937 correction Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 3
- 230000010287 polarization Effects 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 125000003473 lipid group Chemical group 0.000 description 2
- 238000000819 phase cycle Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 108010076504 Protein Sorting Signals Proteins 0.000 description 1
- 101100289792 Squirrel monkey polyomavirus large T gene Proteins 0.000 description 1
- 210000003484 anatomy Anatomy 0.000 description 1
- 230000003190 augmentative effect Effects 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000002059 diagnostic imaging Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 150000002632 lipids Chemical group 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000013421 nuclear magnetic resonance imaging Methods 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000241 respiratory effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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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
- G01R33/4828—Resolving the MR signals of different chemical species, e.g. water-fat imaging
-
- 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
- G01R33/5613—Generating steady state signals, e.g. low flip angle sequences [FLASH]
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- Condensed Matter Physics & Semiconductors (AREA)
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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Radiology & Medical Imaging (AREA)
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
Description
Δφx(t)=Dxkx(t)
Δφy(t)=Dyky(t)
Δφz(t)=Dzkz(t)
(式中、
Dx、Dy、Dz=システムの等角点からのそれぞれの校正スライスの距離;および、
kx、ky、kz=それぞれのk空間軸に沿った励起スピンのk空間における位置)。
好ましい実施態様では、校正データがそれぞれの勾配軸について20回取得され、その結果が平均化される。この工程は500ms〜1,000msの取得時間を必要とする。
kx(t)=Δφx(t)/Dx
ky(t)=Δφy(t)/Dy
kz(t)=Δφz(t)/Dz。
その後、それぞれの勾配軸についてのこれらの補正されたk空間サンプリング点が結合されて、実際のサンプリング点kactual(t)が、下記のドット積を計算することによってそれぞれの取得されたサンプリング軌跡について得られる:
Claims (15)
- 磁気共鳴造影法(MRI)システムを用いて画像を作製するための方法であって、
a)選択された読取り勾配波形を使用して前記MRIシステムにより校正パルスシーケンスを実行して、校正データを取得する工程;
b)前記選択された読取り勾配波形をデータ取得期間中に作製し、かつ、第1のRFパルス位相パターンを用いる三次元投影再構成パルスシーケンスを使用して、前記MRIシステムにより第1のk空間データセットを取得する工程;
c)前記選択された読取り勾配波形をデータ取得期間中に作製し、かつ、第2のRFパルス位相パターンを用いる前記三次元投影再構成パルスシーケンスを使用して、前記MRIシステムにより第2のk空間データセットを取得する工程;
d)前記校正データを使用して前記第1および第2のk空間データセットを補正する工程;および
e)前記第1および第2の補正されたk空間データセットから水の画像を作製する工程
を含む方法。 - 工程e)が、
i)前記第1の補正されたk空間データセットから第1の画像を再構成すること;
ii)前記第2の補正されたk空間データセットから第2の画像を再構成すること;および
iii)前記第1および第2の画像からのデータを結合すること
によって行われる、請求項1に記載の方法。 - 前記選択された読取り勾配波形が、所定の傾斜によってつながれた複数のローブから構成され、かつ、k空間データが、実質的には前記選択された読取り勾配波形の作製期間中を通して取得される、請求項1に記載の方法。
- 前記選択された読取り勾配波形が複数の傾斜を含み、k空間データが前記傾斜の作製期間中に取得される、請求項3に記載の方法。
- 前記校正パルスシーケンスが、
i)選択可能なRF励起パルスを、勾配軸に沿って向けられたスライス選択勾配の存在下で作製すること;
ii)同じ勾配軸に沿って前記選択された読取り勾配波形を作製すること;および
iii)前記選択された読取り勾配波形の作製の実質的にすべての期間中に校正データを取得すること
を含む、請求項1に記載の方法。 - 前記校正パルスシーケンスが、3つのそれぞれの直交方向に向けられた勾配軸に関して3回行われる、請求項5に記載の方法。
- 前記選択された読取り勾配波形を作製することなく前記校正パルスシーケンスを繰り返すことによってそれぞれの勾配軸についての参照データを取得すること;および
前記参照データを前記校正データと結合すること
を含む、請求項6に記載の方法。 - 前記取得された校正データおよび対応する取得された参照データの位相が計算され、前記参照データが、前記参照位相データをその対応する校正位相データから引くことによって前記校正データと結合させられる、請求項7に記載の方法。
- 前記選択された読取り勾配波形が、k空間が前記三次元投影再構成パルスシーケンスの実施期間中に4つの異なる半径方向のサンプリング軌跡に沿ってサンプリングされるように形状化される、請求項1に記載の方法。
- 前記選択された読取り勾配波形が交互極性の3つのローブを含み、それぞれのローブが1対の傾斜によって境界が定められる、請求項9に記載の方法。
- 第2のローブの境界を定める前記傾斜が、回転勾配ブリップによってそれぞれの第1のローブおよび第3のローブの境界を定める傾斜につながれる、請求項10に記載の方法。
- 前記選択された読取り勾配波形が、傾斜によって境界が定められる交互極性の2つのローブを含み、第1のローブの傾斜が回転勾配ブリップによって第2のローブの傾斜につながれる、請求項1に記載の方法。
- 前記データが、前記選択された読取り勾配波形のローブおよび関連する傾斜の両方を作製している期間中の前記三次元投影再構成パルスシーケンスの実施期間中に取得される、請求項12に記載の方法。
- 工程e)を行う前に、前記取得された第1および第2のk空間データセットを再グリッド化して、デカルト座標データセットを形成することを含み、かつ、工程d)が、前記再グリッド化工程における使用のための実際のk空間サンプリング位置を計算することを含む、請求項1に記載の方法。
- 工程d)が、前記取得された校正データの位相を計算することを含む、請求項14に記載の方法。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/461,227 US6794867B1 (en) | 2003-06-13 | 2003-06-13 | Isotropic imaging of vessels with fat suppression |
PCT/US2004/017871 WO2005001499A1 (en) | 2003-06-13 | 2004-06-07 | Isotropic imaging of vessels with fat suppression |
Publications (2)
Publication Number | Publication Date |
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JP2007534354A true JP2007534354A (ja) | 2007-11-29 |
JP4395516B2 JP4395516B2 (ja) | 2010-01-13 |
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Application Number | Title | Priority Date | Filing Date |
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JP2006533572A Expired - Lifetime JP4395516B2 (ja) | 2003-06-13 | 2004-06-07 | 脂肪抑制を用いる血管の等方性画像形成 |
Country Status (6)
Country | Link |
---|---|
US (1) | US6794867B1 (ja) |
EP (1) | EP1636604B1 (ja) |
JP (1) | JP4395516B2 (ja) |
AT (1) | ATE395612T1 (ja) |
DE (1) | DE602004013775D1 (ja) |
WO (1) | WO2005001499A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011513733A (ja) * | 2008-02-26 | 2011-04-28 | オーエヌ セミコンダクターズ,インコーポレイティド | エコー検出 |
Families Citing this family (24)
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EP1611451A1 (en) * | 2003-03-07 | 2006-01-04 | Mayo Foundation for Medical Research and Education | Method for acquiring time-resolved mr images using continuous table motion |
US7148685B2 (en) * | 2004-05-12 | 2006-12-12 | Wisconsin Alumni Research Foundation | Magnetic resonance imaging with fat suppression |
US7046003B2 (en) * | 2004-09-20 | 2006-05-16 | The Board Of Trustees Of The Leland Stanford Junior University | Reduced-time variable rate excitation pulses for rapid MRI |
JP5004588B2 (ja) * | 2004-10-29 | 2012-08-22 | 株式会社日立メディコ | 磁気共鳴イメージング装置 |
US7265547B2 (en) * | 2005-09-16 | 2007-09-04 | General Electric Company | Method and apparatus for acquiring MR data with a segmented multi-shot radial fan beam encoding order |
US7327141B2 (en) | 2005-11-30 | 2008-02-05 | Wisconsin Alumni Research Foundation | Characterization of receiver demodulation for correcting off-axis MR imaging degradation |
US7132826B1 (en) | 2005-11-30 | 2006-11-07 | Wisconsin Alumni Research Foundation | Characterization of receiver demodulation for correcting off-axis MR imaging degradation |
US8219176B2 (en) * | 2007-03-08 | 2012-07-10 | Allegheny-Singer Research Institute | Single coil parallel imaging |
US7646198B2 (en) * | 2007-03-09 | 2010-01-12 | Case Western Reserve University | Methods for fat signal suppression in magnetic resonance imaging |
US7541808B2 (en) * | 2007-04-11 | 2009-06-02 | Allegheny-Singer Research Institute | Rapid MRI dynamic imaging using MACH |
US7652475B2 (en) * | 2007-05-02 | 2010-01-26 | Case Western Reserve University | Cartesian continuous sampling with unequal gradients |
US7439740B1 (en) * | 2007-05-04 | 2008-10-21 | The Board Of Trustees Of The Leland Stanford Junior University | Artifact reduction in steady-state free precession imaging |
US7834625B2 (en) * | 2008-01-03 | 2010-11-16 | Allegheny-Singer Research Institute | Split-echo with fractional temporal-interpolation |
US8688193B2 (en) * | 2008-06-26 | 2014-04-01 | Allegheny-Singer Research Institute | Magnetic resonance imager, method and program which continuously applies steady-state free precession to k-space |
US8131046B2 (en) * | 2008-10-29 | 2012-03-06 | Allegheny-Singer Research Institute | Magnetic resonance imager using cylindrical offset region of excitation, and method |
US20100234721A1 (en) * | 2009-03-11 | 2010-09-16 | Allegheny-Singer Research Institute | Method and MRI for referenceless flow imaging |
US8198892B2 (en) * | 2009-04-22 | 2012-06-12 | Allegheny-Singer Research Institute | Steady-state-free-precession (SSFP) magnetic resonance imaging (MRI) and method |
US8405394B2 (en) * | 2009-10-20 | 2013-03-26 | Allegheny-Singer Research Institute | Targeted acquisition using holistic ordering (TACHO) approach for high signal to noise imaging |
US20110215805A1 (en) * | 2010-03-03 | 2011-09-08 | Allegheny-Singer Research Institute | MRI and method using multi-slice imaging |
US8970217B1 (en) | 2010-04-14 | 2015-03-03 | Hypres, Inc. | System and method for noise reduction in magnetic resonance imaging |
CN102959425A (zh) * | 2010-04-29 | 2013-03-06 | 伊利诺伊大学受托管理委员会 | 使用转向螺旋桨技术的磁共振成像 |
US8738113B2 (en) | 2010-09-30 | 2014-05-27 | University Of Utah Research Foundation | Retrospectively correlated turbo spin echo imaging |
DE102017209988B3 (de) * | 2017-06-13 | 2018-06-07 | Siemens Healthcare Gmbh | Verfahren zur Kalibrierung bei einem Magnetresonanz-Bildgebungsverfahren |
US10969451B1 (en) * | 2019-09-23 | 2021-04-06 | GE Precision Healthcare LLC | Systems and methods for in-phase zero echo time magnetic resonance imaging |
Family Cites Families (9)
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DE3542215A1 (de) * | 1985-11-29 | 1987-06-04 | Philips Patentverwaltung | Kernspintomographieverfahren und anordnung zur durchfuehrung des verfahrens |
US5909119A (en) * | 1995-08-18 | 1999-06-01 | Toshiba America Mri, Inc. | Method and apparatus for providing separate fat and water MRI images in a single acquisition scan |
US6487435B2 (en) | 1998-04-10 | 2002-11-26 | Wisconsin Alumni Research Foundation | Magnetic resonance angiography using undersampled 3D projection imaging |
DE19836612C2 (de) | 1998-08-12 | 2000-06-29 | Siemens Ag | Verfahren zum Betrieb eines Kernspintomographiegeräts zur Trennung von Wasser- und Fettsignalen |
US6307368B1 (en) | 1999-05-14 | 2001-10-23 | Board Of Trustees Of The Leland Stanford Junior University | Linear combination steady-state free precession MRI |
DE10016234B4 (de) | 2000-03-31 | 2006-12-14 | Siemens Ag | Verfahren zur Bildgebung mittels Kernspinresonanz bei einer gekrümmt verlaufenden K-Raum-Trajektorie |
US6552542B1 (en) * | 2001-09-28 | 2003-04-22 | The Board Of Trustees Of The Leland Stanford Junior University | Oscillating dual-equilibrium steady state angiography using magnetic resonance imaging |
EP1444530B1 (en) * | 2001-11-12 | 2008-08-13 | Wisconsin Alumni Research Foundation | Three-dimensional phase contrast magnetic resonance imaging using interleaved projection-reconstruction data |
US6608479B1 (en) * | 2002-05-15 | 2003-08-19 | General Electric Company | Method and system for MRI with lipid suppression |
-
2003
- 2003-06-13 US US10/461,227 patent/US6794867B1/en not_active Expired - Lifetime
-
2004
- 2004-06-07 EP EP04754470A patent/EP1636604B1/en not_active Expired - Lifetime
- 2004-06-07 WO PCT/US2004/017871 patent/WO2005001499A1/en active Application Filing
- 2004-06-07 JP JP2006533572A patent/JP4395516B2/ja not_active Expired - Lifetime
- 2004-06-07 DE DE602004013775T patent/DE602004013775D1/de not_active Expired - Lifetime
- 2004-06-07 AT AT04754470T patent/ATE395612T1/de not_active IP Right Cessation
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011513733A (ja) * | 2008-02-26 | 2011-04-28 | オーエヌ セミコンダクターズ,インコーポレイティド | エコー検出 |
JP2015129752A (ja) * | 2008-02-26 | 2015-07-16 | セミコンダクター・コンポーネンツ・インダストリーズ・リミテッド・ライアビリティ・カンパニー | エコー検出 |
Also Published As
Publication number | Publication date |
---|---|
DE602004013775D1 (de) | 2008-06-26 |
WO2005001499B1 (en) | 2005-03-03 |
EP1636604B1 (en) | 2008-05-14 |
US6794867B1 (en) | 2004-09-21 |
EP1636604A1 (en) | 2006-03-22 |
ATE395612T1 (de) | 2008-05-15 |
JP4395516B2 (ja) | 2010-01-13 |
WO2005001499A1 (en) | 2005-01-06 |
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