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Titolo:
ARTIFACTS AND SIGNAL LOSS DUE TO FLOW IN THE PRESENCE OF B-0 INHOMOGENEITY
Autore:
DRANGOVA M; PELC NJ;
Indirizzi:
STANFORD UNIV,DEPT RADIOL,RICHARD M LUCAS MR CTR IMAGLING & SPECT,RADIOL SCI LAB,1201 WELCH RD STANFORD CA 94305
Titolo Testata:
Magnetic resonance in medicine
fascicolo: 1, volume: 35, anno: 1996,
pagine: 126 - 130
SICI:
0740-3194(1996)35:1<126:AASLDT>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
MR;
Keywords:
MAGNETIC RESONANCE FLOW IMAGING; MAGNETIC FIELD INHOMOGENEITY; ARTIFACTS; SIGNAL LOSS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
8
Recensione:
Indirizzi per estratti:
Citazione:
M. Drangova e N.J. Pelc, "ARTIFACTS AND SIGNAL LOSS DUE TO FLOW IN THE PRESENCE OF B-0 INHOMOGENEITY", Magnetic resonance in medicine, 35(1), 1996, pp. 126-130

Abstract

An in vitro study was performed to investigate the effects of B-0 inhomogeneity on magnetic resonance images of flow. Controlled inhomogeneity gradients (G(i)) were applied and the magnitude of the artifacts produced was quantified for different echo delay times (TE). Both steady and pulsatile Rows were examined, In the presence of an inhomogeneity gradient, signal loss is apparent if the flow is pulsatile and/or ifthe slice thickness is large. The signal loss increases with increasing TE and G(i). With pulsatile flow, ghosting artifacts are also generated. These increase in intensity with increasing TE and G(i). In vivo, field inhomogeneity due to susceptibility variations is large enoughto produce these effects. Representative time-of-flight images obtained of a normal volunteer with two different TEs demonstrate the effectin vivo. Flow-related signal loss and artifacts, therefore, increase with increasing TE independent of the moments of the applied gradients.

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Documento generato il 27/11/20 alle ore 11:52:34