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Abstract #4479

Free Breathing Variable Flip Angle Balanced SSFP Cardiac Cine Imaging with Reduced SAR at 3T

Subashini Srinivasan 1,2 , Randall M Kroeker 3 , Adam Plotnik 1 , Simon Gabriel 1 , Nancy Halnon 4 , Peng Hu 1 , J. Paul Finn 1 , and Daniel B Ennis 1,2

1 Department of Radiological Sciences, University of California, Los Angeles, California, United States, 2 Department of Bioengineering, University of California, Los Angeles, California, United States, 3 Siemens Healthcare, Malvern, Pennsylvania, United States, 4 Department of Pediatrics, University of California, Los Angeles, California, United States

Breath-hold, segmented, constant flip angle (BH-CFA) bSSFP cardiac cine imaging can be challenging at 3T in patients with poor breath holding capacity which results in motion artifacts. Real-time, free-breathing imaging with retrospective reconstruction can be SAR intensive, which may limit image quality. The objective of this study was to develop and evaluate a free breathing variable FA (FB-VFA) cardiac cine imaging technique with reduced SAR at 3T for improved comfort and compliance. FB-VFA reduced the SAR by 25% compared to BH-CFA and maintained blood-myocardium contrast and image quality sufficient to perform global and regional cardiac functional analysis.

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