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Abstract #0660

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

1 Siemens Healthcare, Los Angeles, CA, United States, 2 Radiology, UCLA, Los Angeles, CA, United States, 3 Siemens Healthcare, Winnipeg, MB, Canada, 4 Siemens 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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