[go: up one dir, main page]

IL124975A0 - Correction of axial image signal fall-off caused by maxwell terms - Google Patents

Correction of axial image signal fall-off caused by maxwell terms

Info

Publication number
IL124975A0
IL124975A0 IL12497598A IL12497598A IL124975A0 IL 124975 A0 IL124975 A0 IL 124975A0 IL 12497598 A IL12497598 A IL 12497598A IL 12497598 A IL12497598 A IL 12497598A IL 124975 A0 IL124975 A0 IL 124975A0
Authority
IL
Israel
Prior art keywords
correction
caused
image signal
axial image
signal fall
Prior art date
Application number
IL12497598A
Other languages
English (en)
Original Assignee
Gen Electric
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.)
Filing date
Publication date
Application filed by Gen Electric filed Critical Gen Electric
Publication of IL124975A0 publication Critical patent/IL124975A0/xx

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]
    • G01R33/48—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
    • G01R33/56572—Correction of image distortions, e.g. due to magnetic field inhomogeneities caused by a distortion of a gradient magnetic field, e.g. non-linearity of a gradient magnetic field
    • G01R33/56581—Correction of image distortions, e.g. due to magnetic field inhomogeneities caused by a distortion of a gradient magnetic field, e.g. non-linearity of a gradient magnetic field due to Maxwell fields, i.e. concomitant fields
    • 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)
  • Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • General Health & Medical Sciences (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Radiology & Medical Imaging (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Nonlinear Science (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
  • Image Processing (AREA)
  • Image Analysis (AREA)
  • Medical Treatment And Welfare Office Work (AREA)
IL12497598A 1997-07-01 1998-06-17 Correction of axial image signal fall-off caused by maxwell terms IL124975A0 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US08/886,830 US5917323A (en) 1997-07-01 1997-07-01 Correction of axial image signal fall off caused by Maxwell terms

Publications (1)

Publication Number Publication Date
IL124975A0 true IL124975A0 (en) 1999-01-26

Family

ID=25389868

Family Applications (1)

Application Number Title Priority Date Filing Date
IL12497598A IL124975A0 (en) 1997-07-01 1998-06-17 Correction of axial image signal fall-off caused by maxwell terms

Country Status (4)

Country Link
US (1) US5917323A (de)
JP (1) JP4301597B2 (de)
DE (1) DE19814677B4 (de)
IL (1) IL124975A0 (de)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3365983B2 (ja) * 1999-09-28 2003-01-14 ジーイー横河メディカルシステム株式会社 Ｍｒｉ装置
US6603989B1 (en) * 2000-03-21 2003-08-05 Dmitriy A. Yablonskiy T2 contrast in magnetic resonance imaging with gradient echoes
US6618607B2 (en) * 2000-10-20 2003-09-09 Duke University MRI imaging methods using a single excitation
DE10221640B4 (de) * 2002-05-15 2007-06-21 Siemens Ag Verfahren zur Vibrationskompensation bei Kernspintomographen
EP1779130A1 (de) * 2004-08-13 2007-05-02 Philips Intellectual Property & Standards GmbH Mr-verfahren zur quantitativen bestimmung von lokalen relaxationszeitwerten
WO2011031625A2 (en) * 2009-09-08 2011-03-17 California Institute Of Technology New technique for performing dielectric property measurements at microwave frequencies
US8970217B1 (en) 2010-04-14 2015-03-03 Hypres, Inc. System and method for noise reduction in magnetic resonance imaging
DE102013206026B3 (de) * 2013-04-05 2014-08-28 Siemens Aktiengesellschaft Optimierte Gradientenecho-Multiecho-Messsequenz
US10132889B2 (en) * 2013-05-22 2018-11-20 General Electric Company System and method for reducing acoustic noise level in MR imaging
CN105718729B (zh) * 2016-01-20 2018-07-24 河海大学 一种柱面轴向梯度线圈设计中磁场与电感值的计算方法
CN106707208B (zh) * 2016-12-15 2019-04-30 重庆大学 一种用于浅层皮肤成像的低场单边核磁共振设备
US11249163B2 (en) * 2017-11-27 2022-02-15 Shenzhen Institutes Of Advanced Technology Eddy-current correction method and apparatus, mobile terminal and readable storage medium
EP3715896B1 (de) * 2019-03-27 2023-02-15 Siemens Healthcare GmbH Minimierung von signalverlusten in der multi-echo-bildgebung
US11243287B2 (en) 2019-10-02 2022-02-08 Synaptive Medical Inc. Real-time compensation of high-order concomitant magnetic fields
EP3851866A1 (de) * 2020-01-16 2021-07-21 Siemens Healthcare GmbH Phasengleiche und phasenverschobene magnetresonanzbildgebung

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4591789A (en) * 1983-12-23 1986-05-27 General Electric Company Method for correcting image distortion due to gradient nonuniformity
US4647858A (en) * 1985-07-29 1987-03-03 General Electric Company Methods for overcoming transient magnetic field inhomogeneity in nuclear magnetic resonance imaging
DE3730148A1 (de) * 1987-09-09 1989-03-30 Bruker Medizintech Verfahren zum erzeugen von spin-echo-impulsfolgen mit einem kernspin-tomographen und zur durchfuehrung des verfahrens ausgebildeter kernspin-tomograph
US4885542A (en) * 1988-04-14 1989-12-05 The Regents Of The University Of California MRI compensated for spurious NMR frequency/phase shifts caused by spurious changes in magnetic fields during NMR data measurement processes
JPH03224538A (ja) * 1990-01-31 1991-10-03 Hitachi Medical Corp 一次の静磁場不均一を補正して計測する過程を備えたｍｒｉ装置
US5226418A (en) * 1991-08-01 1993-07-13 General Electric Company Phase correction of complex - difference processed magnetic resonance angiograms
EP0577188B1 (de) * 1992-06-29 1999-09-01 Koninklijke Philips Electronics N.V. Verfahren und Gerät zur Kernresonanzabbildung
US5539311A (en) * 1992-12-03 1996-07-23 Hitachi Medical Corporation Method for reducing artifacts in magnetic resonance imaging
EP0644437B1 (de) * 1993-09-16 1999-05-12 Koninklijke Philips Electronics N.V. Korrektur der Polarität des Auslesegradienten in Bilderzeugung durch EPI und GRASE magnetische Resonanz
DE4438488A1 (de) * 1994-10-28 1996-05-02 Philips Patentverwaltung MR-Verfahren und Anordnung zur Durchführung desselben
US5545995A (en) * 1994-11-29 1996-08-13 General Electric Company Measurement of geometric distortion in MRI images
DE4445782C1 (de) * 1994-12-21 1996-07-25 Siemens Ag Verfahren zur Phasenkorrektur von Kernresonanzsignalen
US5689186A (en) * 1995-12-26 1997-11-18 General Electric Company Method for producing an off-center image using an EPI pulse sequence
US5810727A (en) * 1996-04-24 1998-09-22 U.S. Philips Corporation Method of and device for the imaging of objects by means of magnetic resonance

Also Published As

Publication number Publication date
US5917323A (en) 1999-06-29
JPH11104110A (ja) 1999-04-20
DE19814677A1 (de) 1999-01-07
DE19814677B4 (de) 2009-10-08
JP4301597B2 (ja) 2009-07-22

Similar Documents

Publication Publication Date Title
TW532569U (en) CMOS image sensor
PL339551A1 (en) Derivatives of rezorcin
IL125781A (en) Precise position determination of endoscopes
GB9708020D0 (en) Image sensor
IL134086A0 (en) Novel spiroazabicyclic heterocyclic compounds
PT892640E (pt) Composicoes farmaceuticas de micofenolato entericamente revestidas
GB9618717D0 (en) Image sensor
IL124975A0 (en) Correction of axial image signal fall-off caused by maxwell terms
PL327943A1 (en) Condensed heterocyclic derivatives of morphonoide (ii)
IL132170A0 (en) Novel heterocyclic compounds
PL327998A1 (en) Novel derivatives of 19-nor-pregnene
GB2326977B (en) Solid-state image sensor
GB2324651B (en) Improved solid state image sensor
PL334769A1 (en) Derivatives of 5-aroylnaphtene
ZA981920B (en) Novel heterocyclic compounds
GB9603052D0 (en) Image sensor
SG74091A1 (en) Image sensor
IL131958A0 (en) Anti-convulsant isoquinolyl-benzamide derivatives
PL338777A1 (en) Derivative of piperidinylmethyloxazolydinone
EP0862340A4 (de) Bildsignalverarbeitungsgerät
ZA985448B (en) Novel heterocyclic compounds
GB9608178D0 (en) Image enhancement using interferometry
ZA983800B (en) Novel heterocyclic compounds
TW314234U (en) Improved structure of image sensor
SI0906314T1 (en) Optical resolution of narwedine-type compounds

Legal Events

Date Code Title Description
KB Patent renewed
MM9K Patent not in force due to non-payment of renewal fees