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Titolo:
B-0-fluctuation-induced temporal variation in EPI image series due to the disturbance of steady-state free precession
Autore:
Zhao, XL; Bodurka, J; Jesmanowicz, A; Li, SJ;
Indirizzi:
Med Coll Wisconsin, Biophys Res Inst, Milwaukee, WI 53226 USA Med Coll Wisconsin Milwaukee WI USA 53226 s Inst, Milwaukee, WI 53226 USA Univ Bydgoszcz, Sch Med Sci, Dept Biophys, Bydgoszcz, Poland Univ Bydgoszcz Bydgoszcz Poland ed Sci, Dept Biophys, Bydgoszcz, Poland
Titolo Testata:
MAGNETIC RESONANCE IN MEDICINE
fascicolo: 5, volume: 44, anno: 2000,
pagine: 758 - 765
SICI:
0740-3194(200011)44:5<758:BTVIEI>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
ECHO MRI TECHNIQUES; HUMAN-BRAIN; TRANSVERSE MAGNETIZATION; NMR; VISUALIZATION; RELAXATION; INTENSITY; DIFFUSION; SEQUENCES; SOFTWARE;
Keywords:
steady-state free precession; echo-planar imaging; B-0 fluctuation; crusher gradient, disturbance;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Li, SJ Med Coll Wisconsin, Biophys Res Inst, 8701 Watertown Plank Rd, Milwaukee, WI 53226 USA Med Coll Wisconsin 8701 Watertown Plank Rd Milwaukee WIUSA 53226 A
Citazione:
X.L. Zhao et al., "B-0-fluctuation-induced temporal variation in EPI image series due to the disturbance of steady-state free precession", MAGN RES M, 44(5), 2000, pp. 758-765

Abstract

Steady-state free precession (SSFP) can develop under a train of RF pulses, given the condition TR < T-2. SSFP in multi-shot imaging sequences has been well studied. It is shown here that serial single-shot echo-planar imaging (EPI) acquisition can also develop SSFP, and the SSFP can be disturbed by B-0 fluctuation, causing voxel-wise temporal variation. This SSFP disturbance is predominantly present in cerebrospinal fluid (CSF) regions due to the long T-2 value. By applying a sufficiently strong crusher gradient in the EPI pulse sequence, the temporal variation induced by SSFP disturbance can be suppressed due to diffusion. Evidence is provided to indicate that physiological motions such as cardiac pulsation and respiration could affect the voxel-wise time courses through the mechanism of SSFP disturbance. It isadvised that if the disturbance is observed in serial EPI images, the crusher should be made stronger to eliminate the unwanted temporal variation. (C) 2000 Wiley-Liss, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/04/20 alle ore 18:10:20