JP2001511058A - 磁気共鳴画像用の方法及び装置 - Google Patents
磁気共鳴画像用の方法及び装置Info
- Publication number
- JP2001511058A JP2001511058A JP53223799A JP53223799A JP2001511058A JP 2001511058 A JP2001511058 A JP 2001511058A JP 53223799 A JP53223799 A JP 53223799A JP 53223799 A JP53223799 A JP 53223799A JP 2001511058 A JP2001511058 A JP 2001511058A
- Authority
- JP
- Japan
- Prior art keywords
- pulse
- magnetic field
- function
- slice
- modulation function
- Prior art date
- Legal status (The legal status 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 status listed.)
- Ceased
Links
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]
- G01R33/446—Multifrequency selective RF pulses, e.g. multinuclear acquisition mode
-
- 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
- G01R33/563—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution of moving material, e.g. flow contrast angiography
- G01R33/56341—Diffusion imaging
Landscapes
- Physics & Mathematics (AREA)
- High Energy & Nuclear Physics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Vascular Medicine (AREA)
- General Health & Medical Sciences (AREA)
- Radiology & Medical Imaging (AREA)
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
Description
Claims (1)
- 【特許請求の範囲】 1. − 身体第一の部分の核スピンを励起し、 − 該第一の部分のMR信号のデータの組を測定し、 − 測定されたデータの組から画像を再構成する各段階からなり、定常磁界の方 向に関して身体の第二の部分の磁化の回転のためにRFパルスを発生する段階を 更に含む、磁気共鳴(MR)により定常磁界に配置された上記第一の部分の画像 を決定する方法であって、上記第二の部分の磁化の回転のためのRFパルスは第 一の選択RFパルスと第二の選択RFパルスの結合からなることを特徴とする画 像決定方法。 2. − 第一の磁界傾斜パルスは時間の第一の傾斜関数による第一の選択RFパルス と共に発生され、 − 第二の磁界傾斜パルスは第一の傾斜関数の時間反転バージョンである時間の 第二の傾斜関数による第二の選択RFパルスと共に発生され、 − 第二の傾斜関数の符号は第一の傾斜関数の符号と逆であり、 − 第一の選択RFパルスは時間の第一の振幅変調関数と時間の第一の周波数変 調関数により印加され、 − 第二の選択RFパルスは第二の振幅変調関数と第二の周波数変調関数により 印加され、 − 第二の振幅変調関数は第一の振幅変調関数の時間反転されたバージョンであ り、 − 第二の周波数変調関数は第一の周波数変調関数の時間反転されたバージョン であり、 − 第二の周波数変調関数の符号は第一の周波数変調関数の符号と 反対である請求項1記載の方法。 3. 第一の選択RFパルスのフリップ角及び第二のRFパルスのフリップ角は 概略90°である請求項1記載の方法。 4. 磁化を180°回転するRFパルスは身体の第一の部分のスピンの励起の 前に発生される請求項1記載の方法。 5. − 磁化の回転のためのRFパルスは身体の第一の部分のスピンの励起の後に発 生され、 − 更なる磁界傾斜パルスがMR信号を発生するためのリフォーカシングパルス としてスライスの法線方向に印加される請求項1記載の方法。 6. 第一のRFパルスと第二のRFパルスとの間の時間間隔は概略4ミリ秒で ある請求項1記載の方法。 7. − 一時的な磁界傾斜を発生する手段と、 − RFパルスを発生する手段と、 − MR信号を受信する手段と、 − 受信されたMR信号の画像の再構成のための処理手段と、 − 一時的な磁界傾斜を発生する手段とRFパルスを発生する手段とに対して制 御信号を発生する制御手段とからなり、 − 制御手段はRF励起パルスと、身体の第二の部分で磁化の回転のためのRF パルスとからなるMR画像化シーケンスを発生するために配置される実質的に均 一で定常な磁界内に配置された身体の一部分の画像を収集するためのMR装置で あって、 − MR画像シーケンスを発生する制御手段は磁化の回転のためのRFパルスは 第一の選択RFパルスと第二の選択RFパルスの結合からなるように配置される MR装置。
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97203906 | 1997-12-12 | ||
EP97203906.9 | 1997-12-12 | ||
EP98202108 | 1998-06-25 | ||
EP98202108.1 | 1998-06-25 | ||
PCT/IB1998/001898 WO1999031523A1 (en) | 1997-12-12 | 1998-11-30 | Method and device for magnetic resonance imaging |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2001511058A true JP2001511058A (ja) | 2001-08-07 |
Family
ID=26147150
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP53223799A Ceased JP2001511058A (ja) | 1997-12-12 | 1998-11-30 | 磁気共鳴画像用の方法及び装置 |
Country Status (5)
Country | Link |
---|---|
US (1) | US6252399B1 (ja) |
EP (1) | EP0963560B1 (ja) |
JP (1) | JP2001511058A (ja) |
DE (1) | DE69832693T2 (ja) |
WO (1) | WO1999031523A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USD652446S1 (en) | 2009-07-02 | 2012-01-17 | Fujifilm Dimatix, Inc. | Printhead assembly |
USD653284S1 (en) | 2009-07-02 | 2012-01-31 | Fujifilm Dimatix, Inc. | Printhead frame |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6690386B2 (en) * | 2001-05-31 | 2004-02-10 | Dynapel Systems, Inc. | Medical image display system |
US7132348B2 (en) * | 2002-03-25 | 2006-11-07 | Micron Technology, Inc. | Low k interconnect dielectric using surface transformation |
US6943065B2 (en) * | 2002-03-25 | 2005-09-13 | Micron Technology Inc. | Scalable high performance antifuse structure and process |
US6717405B2 (en) * | 2002-04-12 | 2004-04-06 | Beth Israel Deaconess Medical Center, Inc. | Arterial spin labeling using time varying gradients |
US7071689B2 (en) * | 2002-12-04 | 2006-07-04 | The Johns Hopkins University | Methods for multiple acquisitions with global inversion cycling for vascular-space-occupancy dependant and apparatuses and devices related thereto |
US8237439B2 (en) * | 2009-08-13 | 2012-08-07 | General Electric Company | Composite pulse design method for large-tip-angle excitation in high field magnetic resonance imaging |
EP2500741A1 (en) * | 2011-03-17 | 2012-09-19 | Koninklijke Philips Electronics N.V. | Magnetic resonance measurement of ultrasound properties |
US10534056B2 (en) * | 2012-06-27 | 2020-01-14 | Siemens Healthcare Gmbh | System for simultaneous dual-slab acquisition of MR images with asymmetric and time-reversed asymmetric, concatenated pulses |
US20210228096A1 (en) * | 2020-01-28 | 2021-07-29 | The Johns Hopkins University | Measurement of blood volume using fourier-transform based velocity-selective pulse trains on mri |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4521733A (en) * | 1983-05-23 | 1985-06-04 | General Electric Company | NMR Imaging of the transverse relaxation time using multiple spin echo sequences |
US4701708A (en) * | 1986-08-01 | 1987-10-20 | General Electric Company | Polarization transfer by selective homonuclear technique for suppression of uncoupled spins in NMR spectroscopy |
US5402785A (en) | 1991-08-16 | 1995-04-04 | Trustees Of The University Of Penna | Methods for measuring perfusion using magnetic resonance imaging |
US5532594A (en) * | 1994-04-06 | 1996-07-02 | Bruker Instruments, Inc. | Method for suppressing solvent resonance signals in NMR experiments |
EP0782711B1 (en) * | 1995-07-20 | 2004-04-28 | Philips Electronics N.V. | Method and device for imaging a curved portion of a body by means of magnetic resonance |
-
1998
- 1998-11-30 EP EP98954670A patent/EP0963560B1/en not_active Expired - Lifetime
- 1998-11-30 DE DE69832693T patent/DE69832693T2/de not_active Expired - Fee Related
- 1998-11-30 JP JP53223799A patent/JP2001511058A/ja not_active Ceased
- 1998-11-30 WO PCT/IB1998/001898 patent/WO1999031523A1/en active IP Right Grant
- 1998-12-10 US US09/209,088 patent/US6252399B1/en not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USD652446S1 (en) | 2009-07-02 | 2012-01-17 | Fujifilm Dimatix, Inc. | Printhead assembly |
USD653284S1 (en) | 2009-07-02 | 2012-01-31 | Fujifilm Dimatix, Inc. | Printhead frame |
Also Published As
Publication number | Publication date |
---|---|
DE69832693T2 (de) | 2006-08-17 |
DE69832693D1 (de) | 2006-01-12 |
EP0963560B1 (en) | 2005-12-07 |
WO1999031523A1 (en) | 1999-06-24 |
EP0963560A1 (en) | 1999-12-15 |
US6252399B1 (en) | 2001-06-26 |
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