Experimental study of the effects of 'fractional' gating on flow measurements

M. H. Buonocore, L. Gao

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Velocity encoded phase imaging is subject to errors from phase and amplitude variations of the k-space data caused by beat-to-beat variations of the flow. Fractional cardiac gating is defined as asynchronous gating with each phase encode step occupying a fixed fraction of the RR interval. The gating fraction is the inverse of the number of phase encode steps taken per RR interval. Studies in normal subjects show that deviations and standard errors of ascending and descending aorta flow measurements are significantly greater with decreased gating fraction. Significant errors occur when gating does not separate systolic and diastolic data. The studies establish a graded trade-off between flow measurement accuracy and precision with imaging time, and show that standard nongated phase contrast measurements of strongly pulsatile flow are unreliable.

Original languageEnglish (US)
Pages (from-to)429-436
Number of pages8
JournalMagnetic Resonance in Medicine
Volume31
Issue number4
StatePublished - 1994

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Pulsatile Flow
Thoracic Aorta
Aorta

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology

Cite this

Experimental study of the effects of 'fractional' gating on flow measurements. / Buonocore, M. H.; Gao, L.

In: Magnetic Resonance in Medicine, Vol. 31, No. 4, 1994, p. 429-436.

Research output: Contribution to journalArticle

Buonocore, M. H. ; Gao, L. / Experimental study of the effects of 'fractional' gating on flow measurements. In: Magnetic Resonance in Medicine. 1994 ; Vol. 31, No. 4. pp. 429-436.
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