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Blood flow measurement using variable velocity encoding in the RR interval
Author(s) -
Buonocore Michael H.
Publication year - 1993
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.1910290611
Subject(s) - interval (graph theory) , variable (mathematics) , flow (mathematics) , mathematics , blood flow , encoding (memory) , statistics , medicine , mathematical analysis , computer science , cardiology , combinatorics , geometry , artificial intelligence
Velocity‐encoded phase imaging using asynchronous gating requires input of a velocity encoding value to set the velocity sensitivity of the pulse sequence. The raw data interpolation and reconstruction scheme that the pulse sequence uses forces the encoding value to be constant throughout the RR interval. The sequence and the raw data interpolation scheme were modified to allow two velocity encodings during the RR interval. Two‐hundred cm/s encoding was used in systole, and 30 cm/s in diastole. Changing the encoding in diastole significantly improved the accuracy and precision of ascending aorta flow measurements.