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Fast angiography using selective inversion recovery
Author(s) -
Wang Samuel J.,
Nishimura Dwight G.,
Macovski Albert
Publication year - 1992
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.1910230112
Subject(s) - ghosting , weighting , computer science , offset (computer science) , signal (programming language) , inversion (geology) , computer vision , artificial intelligence , angiography , phase (matter) , algorithm , physics , acoustics , radiology , medicine , geology , paleontology , structural basin , quantum mechanics , programming language
Abstract We have developed an enhancement of selective inversion recovery that allows us to obtain high‐resolution angiograms in reduced Scan time. By applying several read pulses following each tagging inversion pulse, we can obtain several phase encodes in each cardiac cycle, thereby reducing the total scan time required for a complete image. Using this technique, high‐resolution angiograms can be obtained in as little as 15 s. Because the phase encodes are collected in short bursts separated by long pauses, care must be taken to maintain uniform signal weighting across phase‐encoding views and avoid ghosting. We use an increasing flip‐angle sequence to equalize signal level weighting across the readouts. The phase encodes are collected in a special order to minimize ghosting. A postprocessing technique is used to further reduce signal nonuniformity between phase encodes. This fast angiography technique can significantly reduce artifacts due to patient motion during scanning and is especially useful for imaging vasculature in regions of the body where respiratory motion is a problem. © 1992 Academic Press, Inc.