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Titolo:
EFFECTS OF PHYSIOLOGICAL WAVE-FORM VARIABILITY IN TRIGGERED MR-IMAGING - THEORETICAL-ANALYSIS
Autore:
LAUZON ML; HOLDSWORTH DW; FRAYNE R; RUTT BK;
Indirizzi:
UNIV WESTERN ONTARIO,DEPT MED BIOPHYS LONDON ON CANADA UNIV WESTERN ONTARIO,DEPT MED BIOPHYS LONDON ON CANADA UNIV WESTERN ONTARIO HOSP,DEPT DIAGNOST RADIOL LONDON N6A 5A5 ON CANADA JOHN P ROBARTS RES INST,TOM LAWSON FAMILY IMAGING RES LABS LONDON N6A5K8 ON CANADA
Titolo Testata:
Journal of magnetic resonance imaging
fascicolo: 6, volume: 4, anno: 1994,
pagine: 853 - 867
SICI:
1053-1807(1994)4:6<853:EOPWVI>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
MAGNETIC-RESONANCE; PULSATILE VELOCITY; FLOW; MOTION; ARTIFACTS;
Keywords:
BLOOD, FLOW DYNAMICS; FLOW ARTIFACTS; IMAGE PROCESSING; MODEL, MATHEMATICAL; PHASE IMAGING; VASCULAR IMAGING; VELOCITY STUDIES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
26
Recensione:
Indirizzi per estratti:
Citazione:
M.L. Lauzon et al., "EFFECTS OF PHYSIOLOGICAL WAVE-FORM VARIABILITY IN TRIGGERED MR-IMAGING - THEORETICAL-ANALYSIS", Journal of magnetic resonance imaging, 4(6), 1994, pp. 853-867

Abstract

One of the assumptions inherent in most forms of triggered magnetic resonance (MR) imaging is that the pulsatile waveform (be it cardiac, respiratory, or some other) is purely periodic. In reality, the periodicity condition is rarely met. Physiologic waveform variability may lead to image artifacts and errors in velocity or volume flow rate estimates. The authors analyze the effects of physiologic waveform variability in triggered MR imaging. They propose that this variability be treated as a modulation of the underlying motion waveform. This report concentrates on amplitude modulation of the velocity waveform, which results in amplitude and phase modulation of the transverse magnetization. Established Fourier and modulation theory and the recently described principles of (k, t)-space were used to derive the appearance of physiologic waveform variability artifacts in triggered MR images and to predict errors in time-averaged and instantaneous velocity estimates that may result from such motion effects, including effects such as ghostoverlap. simulations and experimental results are provided to confirmthe theory.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 31/03/20 alle ore 16:30:46