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Titolo:
Voxel sensitivity function description of flow-induced signal loss in MR imaging: Implications for black-blood MR angiography with turbo spin-echo sequences
Autore:
Jara, H; Yu, BC; Caruthers, SD; Melhem, ER; Yucel, EK;
Indirizzi:
Boston Univ, Sch Med, Boston Med Ctr, Boston, MA 02118 USA Boston Univ Boston MA USA 02118 Med, Boston Med Ctr, Boston, MA 02118 USA Philips Med Syst N Amer, Shelton, CT 06484 USA Philips Med Syst N Amer Shelton CT USA 06484 Amer, Shelton, CT 06484 USA
Titolo Testata:
MAGNETIC RESONANCE IN MEDICINE
fascicolo: 3, volume: 41, anno: 1999,
pagine: 575 - 590
SICI:
0740-3194(199903)41:3<575:VSFDOF>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
LOWER-EXTREMITIES; IN-VITRO; MECHANISMS;
Keywords:
voxel sensitivity function; black-blood MRA; turbo spin-echo;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Jara, H BMC Ctr MRI, 81 E Concord St, Boston, MA 02118 USA BMC Ctr MRI 81 E Concord St Boston MA USA 02118 ston, MA 02118 USA
Citazione:
H. Jara et al., "Voxel sensitivity function description of flow-induced signal loss in MR imaging: Implications for black-blood MR angiography with turbo spin-echo sequences", MAGN RES M, 41(3), 1999, pp. 575-590

Abstract

The conditions in which the image intensity of vessels transporting laminar flow is attenuated in black-blood MR angiography (BB-MRA) with turbo spin-echo (TSE) and conventional spin echo (CSE) pulse sequences are investigated experimentally with a flow phantom, studied theoretically by means of a Bloch equation-voxel sensitivity function (VSF) formalism, and computer modeled. The experiments studied the effects of: a) flow velocity, b) imaging axes orientation relative to the flow direction, and c) phase encoding order of the TSE train. The formulated Bloch equation-VSF theory describes floweffects in two-dimensional (2D)- and 3D-Fourier transform magnetic resonance imaging. In this theoretical framework, the main attenuation mechanism instrumental to BB-MRA, i.e., transverse magnetization dephasing caused by flow in the presence of the imaging gradients, is described in terms of flow-induced distortions of the individual voxel sensitivity functions. The computer simulations predict that the intraluminal homogeneity and extent of flow-induced image intensity attenuation increase as a function of decreasing vessel diameter, in support of the superior image quality achieved with TSE-based BB-MRA in the brain. Magn Reson Med 41:575-590, 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 07:10:15