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Titolo:
Multi-echo segmented k-space imaging: An optimized hybrid sequence for ultrafast cardiac imaging
Autore:
Reeder, SB; Atalar, E; Faranesh, AZ; McVeigh, ER;
Indirizzi:
Johns Hopkins Univ, Sch Med, Dept Biomed Engn, Baltimore, MD 21205 USA Johns Hopkins Univ Baltimore MD USA 21205 d Engn, Baltimore, MD 21205 USA Johns Hopkins Univ, Sch Med, Dept Radiol, Baltimore, MD 21205 USA Johns Hopkins Univ Baltimore MD USA 21205 Radiol, Baltimore, MD 21205 USA
Titolo Testata:
MAGNETIC RESONANCE IN MEDICINE
fascicolo: 2, volume: 41, anno: 1999,
pagine: 375 - 385
SICI:
0740-3194(199902)41:2<375:MSKIAO>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
GRADIENT-ECHO; MYOCARDIAL PERFUSION; MR; MOTION; ARTIFACTS; CONTRAST; ERRORS;
Keywords:
magnetic resonance (MR); cardiac imaging; fast imaging; echo planar imaging; gradient echo imaging; stress testing; perfusion;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: McVeigh, ER Johns Hopkins Univ, Sch Med, Dept Biomed Engn, 407 Traylor Bldg,720 Rutland Johns Hopkins Univ 407 Traylor Bldg,720 Rutland Ave BaltimoreMD USA 21205
Citazione:
S.B. Reeder et al., "Multi-echo segmented k-space imaging: An optimized hybrid sequence for ultrafast cardiac imaging", MAGN RES M, 41(2), 1999, pp. 375-385

Abstract

Cardiac magnetic resonance imaging requires high temporal resolution to resolve motion and contrast uptake with low total scan times to avoid breathing artifacts. While spoiled gradient echo (SPGR) imaging is robust and reproducible, it is relatively inefficient and requires long breath-holds to acquire high time resolution movies of the heart. Echo planar imaging (EPI) is highly efficient with excellent signal-to-noise ratio (SNR) behavior; however, it is particularly difficult to use in the heart because of its sensitivity to chemical shift, susceptibility, and motion. EPI may also require reference scans, which are used to measure hardware delays and phase offsets that cause ghosting artifacts; these reference scans are more difficult and less reliable in the heart. Consequently, a hybrid EPI/SPGR sequence is proposed for application to rapid cardiac imaging. A detailed optimization of SNR and echo train length for multi-echo sequences is presented. It is shown that significant reductions in total scan time are possible while maintaining good image quality. This will allow complete motion sampling of theentire heart in one to three breath-holds, necessary for MR cardiac dobutamine stress testing. Improved speed performance also permits sampling of three to six slices every heartbeat for bolus injection perfusion (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 07:02:58