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Titolo:
Referenceless interleaved echo-planar imaging
Autore:
Reeder, SB; Atalar, E; Faranesh, AZ; McVeigh, ER;
Indirizzi:
Johns Hopkins Univ, Sch Med, Dept Radiol, Baltimore, MD 21287 USA Johns Hopkins Univ Baltimore MD USA 21287 Radiol, Baltimore, MD 21287 USA Johns Hopkins Univ, Sch Med, Dept Biomed Engn, Baltimore, MD 21287 USA Johns Hopkins Univ Baltimore MD USA 21287 d Engn, Baltimore, MD 21287 USA
Titolo Testata:
MAGNETIC RESONANCE IN MEDICINE
fascicolo: 1, volume: 41, anno: 1999,
pagine: 87 - 94
SICI:
0740-3194(199901)41:1<87:RIEI>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
GRADIENT-ECHO; DIFFUSION;
Keywords:
MRI; EPI; reconstruction; calibration; reference scans; compensation blips;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Atalar, E Johnse,opkins Univ, Sch Med, Dept Radiol, N Caroline St,JHOC 4241, Baltimor Johns Hopkins Univ N Caroline St,JHOC 4241 Baltimore MD USA 21287
Citazione:
S.B. Reeder et al., "Referenceless interleaved echo-planar imaging", MAGN RES M, 41(1), 1999, pp. 87-94

Abstract

Interleaved echo-planar imaging (EPI) is an ultrafast imaging technique important for applications that require high time resolution or short total acquisition times. Unfortunately, EPI is prone to significant ghosting artifacts, resulting primarily from system time delays that cause data matrix misregistration. In this work, it is shown mathematically and experimentally that system time delays are orientation dependent, resulting from anisotropic physical gradient delays. This analysis characterizes the behavior of time delays in oblique coordinates, and a new ghosting artifact caused by anisotropic delays is described. "Compensation blips" are proposed for time delay correction. These blips are shown to remove the effects of anisotropic gradient delays, eliminating the need for repeated reference scans and postprocessing corrections. Examples of phantom and in vivo images are shown. Magn Reson Med 41:87-94, 1999. (C) 1999 Wiley-Liss, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 06:14:56