JP3898294B2 - Ｍｒ方法及び装置 - Google Patents

Ｍｒ方法及び装置 Download PDF

Info

Publication number: JP3898294B2
Authority: JP; Japan
Prior art keywords: gradient; magnetic field; field; coil system; signal
Prior art date: 1996-08-07
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.): Expired - Fee Related

Application number

JP20933897A

Other languages

English (en)

Japanese (ja)

Other versions

JPH1071135A5 (2

JPH1071135A (ja

Inventor

アルデフェルトベルント

ベルネルトペーター

Original Assignee

コニンクリユケフィリップスエレクトロニクスエヌ．ブイ．

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.)

1996-08-07

Filing date

1997-08-04

Publication date

2007-03-28

1997-08-04 Application filed by コニンクリユケフィリップスエレクトロニクスエヌ．ブイ． filed Critical コニンクリユケフィリップスエレクトロニクスエヌ．ブイ．

1998-03-17 Publication of JPH1071135A publication Critical patent/JPH1071135A/ja

2005-05-26 Publication of JPH1071135A5 publication Critical patent/JPH1071135A5/ja

2007-03-28 Application granted granted Critical

2007-03-28 Publication of JP3898294B2 publication Critical patent/JP3898294B2/ja

2017-08-04 Anticipated expiration legal-status Critical

Status Expired - Fee Related legal-status Critical Current

Links

238000000034 method Methods 0.000 title claims description 26
230000004044 response Effects 0.000 claims description 13
230000005415 magnetization Effects 0.000 claims description 10
230000002123 temporal effect Effects 0.000 claims description 10
238000012937 correction Methods 0.000 claims description 9
230000007423 decrease Effects 0.000 claims description 4
238000009826 distribution Methods 0.000 claims description 3
230000007704 transition Effects 0.000 claims description 3
238000005259 measurement Methods 0.000 claims description 2
230000036962 time dependent Effects 0.000 claims description 2
230000008859 change Effects 0.000 description 10
239000011159 matrix material Substances 0.000 description 9
230000009466 transformation Effects 0.000 description 6
230000006399 behavior Effects 0.000 description 5
230000000694 effects Effects 0.000 description 5
238000006243 chemical reaction Methods 0.000 description 3
238000007689 inspection Methods 0.000 description 3
230000005284 excitation Effects 0.000 description 2
230000002452 interceptive effect Effects 0.000 description 2
230000010355 oscillation Effects 0.000 description 2
230000010363 phase shift Effects 0.000 description 2
238000013459 approach Methods 0.000 description 1
230000015572 biosynthetic process Effects 0.000 description 1
230000003247 decreasing effect Effects 0.000 description 1
230000001934 delay Effects 0.000 description 1
238000010586 diagram Methods 0.000 description 1
238000012545 processing Methods 0.000 description 1
230000035945 sensitivity Effects 0.000 description 1
238000009827 uniform distribution Methods 0.000 description 1

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
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/48—NMR imaging systems
- G01R33/483—NMR imaging systems with selection of signals or spectra from particular regions of the volume, e.g. in vivo spectroscopy
- G01R33/4833—NMR imaging systems with selection of signals or spectra from particular regions of the volume, e.g. in vivo spectroscopy using spatially selective excitation of the volume of interest, e.g. selecting non-orthogonal or inclined slices
- 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
- 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
- G01R33/56554—Correction of image distortions, e.g. due to magnetic field inhomogeneities caused by acquiring plural, differently encoded echo signals after one RF excitation, e.g. correction for readout gradients of alternating polarity in EPI

Landscapes

Physics & Mathematics (AREA)
Condensed Matter Physics & Semiconductors (AREA)
General Physics & Mathematics (AREA)
High Energy & Nuclear Physics (AREA)
Health & Medical Sciences (AREA)
Spectroscopy & Molecular Physics (AREA)
Optics & Photonics (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)

JP20933897A 1996-08-07 1997-08-04 Ｍｒ方法及び装置 Expired - Fee Related JP3898294B2 (ja)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
DE19631845:9		1996-08-07
DE19631845		1996-08-07

Publications (3)

Publication Number	Publication Date
JPH1071135A JPH1071135A (ja)	1998-03-17
JPH1071135A5 JPH1071135A5 (2)	2005-05-26
JP3898294B2 true JP3898294B2 (ja)	2007-03-28

Family

ID=7802006

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
JP20933897A Expired - Fee Related JP3898294B2 (ja)	1996-08-07	1997-08-04	Ｍｒ方法及び装置

Country Status (4)

Country	Link
US (1)	US5929638A (2)
EP (1)	EP0823642B1 (2)
JP (1)	JP3898294B2 (2)
DE (1)	DE59709890D1 (2)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US6201987B1 (en) *	1998-05-26	2001-03-13	General Electric Company	Error compensation for device tracking systems employing electromagnetic fields
DE19826864A1 (de) *	1998-06-17	1999-12-23	Philips Patentverwaltung	MR-Verfahren
CA2648310C (en) *	2006-04-12	2016-10-18	Thomson Licensing	Virtual dvd on demand and electronic dvd rental/buy/burn
EP3447520A1 (en) *	2017-08-22	2019-02-27	Koninklijke Philips N.V.	Data-driven correction of phase depending artefacts in a magnetic resonance imaging system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US4585995A (en) *	1984-04-19	1986-04-29	Technicare Corporation	Nuclear magnetic resonance eddy field suppression apparatus
EP0216523A3 (en) *	1985-08-27	1989-04-05	Resonex, Inc.	Process for non-orthogonal nmr imaging
US4698591A (en) *	1986-01-03	1987-10-06	General Electric Company	Method for magnetic field gradient eddy current compensation

1997
- 1997-07-18 US US08/896,759 patent/US5929638A/en not_active Expired - Fee Related
- 1997-08-04 JP JP20933897A patent/JP3898294B2/ja not_active Expired - Fee Related
- 1997-08-04 EP EP97202430A patent/EP0823642B1/de not_active Expired - Lifetime
- 1997-08-04 DE DE59709890T patent/DE59709890D1/de not_active Expired - Fee Related

Also Published As

Publication number	Publication date
EP0823642B1 (de)	2003-04-23
EP0823642A1 (de)	1998-02-11
DE59709890D1 (de)	2003-05-28
JPH1071135A (ja)	1998-03-17
US5929638A (en)	1999-07-27

Legal Events

Date	Code	Title	Description
2004-08-04	A521	Written amendment	Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20040803
2004-08-04	A621	Written request for application examination	Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20040803
2006-07-21	A977	Report on retrieval	Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20060721
2006-08-02	A131	Notification of reasons for refusal	Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20060801
2006-10-19	A521	Written amendment	Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20061018
2006-11-07	TRDD	Decision of grant or rejection written
2006-11-22	A01	Written decision to grant a patent or to grant a registration (utility model)	Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20061121
2006-12-28	A61	First payment of annual fees (during grant procedure)	Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20061221
2007-01-05	R150	Certificate of patent or registration of utility model	Free format text: JAPANESE INTERMEDIATE CODE: R150
2010-01-05	LAPS	Cancellation because of no payment of annual fees

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