Breath-Held Phase-Cycled Cardiac Cine MRI using Slow Frequency Modulation
Anjali Datta1, Corey A Baron1, R Reeve Ingle2, Joseph Y Cheng1, and Dwight G Nishimura1
1Electrical Engineering, Stanford University, Stanford, CA, United States, 2HeartVista, Inc., Menlo Park, CA, United States
bSSFP is commonly used for cardiac cine imaging due to its
high myocardium-blood contrast but suffers from signal nulls due to off-resonance.
By modifying the slow frequency modulation scheme for use in the heart, we acquire
interleaved phase-cycles within a breath-hold for banding artifact reduction. Because a constant heart rate cannot be
assumed, the phase increment increases slowly for a time equal to the shortest
expected RR interval and then remains constant until the next trigger. In vivo results indicate that the proposed
method is comparable to standard phase-cycling but with shorter scan time and
interleaved phase-cycle acquisition.
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