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Titolo:
Seducing off-resonance distortion by echo-time interpolation
Autore:
Luk-Pat, GT; Nishimura, DG;
Indirizzi:
Stanford Univ, Dept Elect Engn, Stanford, CA 94305 USA Stanford Univ Stanford CA USA 94305 pt Elect Engn, Stanford, CA 94305 USA Mt Sinai Sch Med, Dept Radiol, New York, NY USA Mt Sinai Sch Med New YorkNY USA Sch Med, Dept Radiol, New York, NY USA
Titolo Testata:
MAGNETIC RESONANCE IN MEDICINE
fascicolo: 2, volume: 45, anno: 2001,
pagine: 269 - 276
SICI:
0740-3194(200102)45:2<269:SODBEI>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
VARYING GRADIENTS; ARTIFACTS;
Keywords:
off-resonance; inhomogeneity; echo-planar imaging; coronary-artery imaging; k-space;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
17
Recensione:
Indirizzi per estratti:
Indirizzo: Nishimura, DG Stanford Univ, Dept Elect Engn, Packard Bldg 255,350 Serra Mall, Stanford,CA 94305 USA Stanford Univ Packard Bldg 255,350 Serra Mall Stanford CA USA 94305
Citazione:
G.T. Luk-Pat e D.G. Nishimura, "Seducing off-resonance distortion by echo-time interpolation", MAGN RES M, 45(2), 2001, pp. 269-276

Abstract

Off-resonant spins, produced by chemical shift, tissue-susceptibility differences, or main-field inhomogeneity, can cause blurring or shifts, severely compromising the diagnostic value of magnetic resonance images. To mitigate these off-resonance effects, the authors propose a technique whereby twoimages are acquired at different echo times (TEs) and interpolated to produce a single image with dramatically-reduced blurring. The phase differenceof these two images is not used to produce a field map; instead, the weighted complex-valued average of the two images is used to produce a single image. Previously-described methods reconstruct a set of preliminary images, each at a different off-resonant frequency, and then assemble these into one final image, choosing the best off-resonant frequency for each voxel. Compared to these methods, the proposed technique requires the same or less processing time and is much less sensitive to errors in the field map. This technique was applied to centric-ordered EPI but it can be applied to any imaging trajectory, including one-shot EPI, spiral imaging, projection-reconstruction imaging, and 2D GRASE. Magn Reson Med 45:269-276, 2001. (C) 2001 Wiley-Liss, Inc.

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Documento generato il 18/01/20 alle ore 13:03:48