Document Detail

Experimental study of the effects of "fractional" gating on flow measurements.
MedLine Citation:
PMID:  8208119     Owner:  NLM     Status:  MEDLINE    
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.
M H Buonocore; L Gao
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Magnetic resonance in medicine : official journal of the Society of Magnetic Resonance in Medicine / Society of Magnetic Resonance in Medicine     Volume:  31     ISSN:  0740-3194     ISO Abbreviation:  Magn Reson Med     Publication Date:  1994 Apr 
Date Detail:
Created Date:  1994-07-13     Completed Date:  1994-07-13     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8505245     Medline TA:  Magn Reson Med     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  429-36     Citation Subset:  IM    
Department of Radiology, UC Davis Medical Center, Sacramento 95817.
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MeSH Terms
Angiography / methods
Aorta / physiology*
Aorta, Thoracic / physiology
Blood Flow Velocity
Magnetic Resonance Imaging / methods
Pulsatile Flow* / physiology
Reference Values
Rheology / methods*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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