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Titolo:
Optimized distortion correction technique for echo planar imaging
Autore:
Chen, NK; Wyrwicz, AM;
Indirizzi:
Northwestern Univ, Ctr MR Res, ENH Res Inst, Evanston, IL 60201 USA Northwestern Univ Evanston IL USA 60201 Res Inst, Evanston, IL 60201 USA Northwestern Univ, Dept Biomed Engn, Evanston, IL 60201 USA Northwestern Univ Evanston IL USA 60201 omed Engn, Evanston, IL 60201 USA Northwestern Univ, Dept Neurobiol & Physiol, Evanston, IL 60201 USA Northwestern Univ Evanston IL USA 60201 & Physiol, Evanston, IL 60201 USA
Titolo Testata:
MAGNETIC RESONANCE IN MEDICINE
fascicolo: 3, volume: 45, anno: 2001,
pagine: 525 - 528
SICI:
0740-3194(200103)45:3<525:ODCTFE>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
HUMAN BRAIN; ACTIVATION; IMAGES; FMRI;
Keywords:
echo planar imaging (EPI); geometrical distortions; multichannel modulation; field mapping;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
11
Recensione:
Indirizzi per estratti:
Indirizzo: Wyrwicz, AM Northwestern Univ, Ctr MR Res, ENH Res Inst, 1033 Univ Pl 150,Evanston, IL 60201 USA Northwestern Univ 1033 Univ Pl 150 Evanston IL USA 60201 1 USA
Citazione:
N.K. Chen e A.M. Wyrwicz, "Optimized distortion correction technique for echo planar imaging", MAGN RES M, 45(3), 2001, pp. 525-528

Abstract

A new phase-shifted EPI pulse sequence is described that encodes EPI phaseerrors due to all off-resonance factors, including B-o field inhomogeneity, eddy current effects, and gradient waveform imperfections. Combined with the previously proposed multichannel modulation postprocessing algorithm (Chen and Wyrwicz, MRM 1999;41:1206-1213), the encoded phase error information can be used to effectively remove geometric distortions in subsequent EPIscans. The proposed EPI distortion correction technique has been shown to be effective in removing distortions due to gradient waveform imperfectionsand phase gradient-induced eddy current effects. In addition, this new method retains advantages of the earlier method, such as simultaneous correction of different off-resonance factors without use of a complicated phase unwrapping procedure. The effectiveness of this technique is illustrated withEPI studies on phantoms and animal subjects. Implementation to different versions of EPI sequences is also described. (C) 2001 Wiley-Liss, Inc.

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Documento generato il 29/03/20 alle ore 17:37:38