Adaptive Steady State Triggering adds confidence to the Thoracic ECG-Gated Contrast Enhanced MR Angiography
Yutaka Natsuaki 1 , J Paul Finn 2 , Randall Kroeker 3 , and Gerhard Laub 4
Siemens Healthcare, Los Angeles, CA, United
UCLA, Los Angeles, CA, United States,
Healthcare, Winnipeg, MB, Canada,
Healthcare, San Francisco, CA, United States
AIn thoracic ECG-gated CEMRA, the steady-state
triggering plays a key role in maintaining the
magnetization and minimizing cardiac pulsatile motion.
The current gated CEMRA assumes steady R-R interval with
the fixed scan window (= trigger delay + segment
acquisition). When R-R interval is disrupted due to
heart rate variation and ECG failure, scan time
substantially increases, which causes problems in
timing-sensitive CEMRA scans. The current study
introduces the Adaptive Steady-State Triggering, a novel
prospective trigger adjustment approach to compensate
the early trigger loss and to force the late trigger
scan completion within an acceptable range.
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