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Abstract #2613

Rapid B1 Mapping in the Presence of B0 Variations

Sohae Chung1, Daniel Kim1, Elodie Breton1, Leon Axel1

1Center for Biomedical Imaging and Radiology, NYU Langone Medical Center, New York, NY, USA

Accurate calibration of B1 field is particularly important at high fields, where large B1 variations can cause flip angle (FA) variations. The most straight-forward "B1 mapping" method is the double angle method. However, it is inefficient due to a need to set TR≥5T1. An alternative approach is to perform a series of RF-prepared TurboFLASH imaging. However, both methods directly measure the FA determined by both B1 and B0, and require a B0 measurement to calculate B1. The purpose of this study was to modify the TurboFLASH imaging to include B0 correction for rapid B1 mapping and to evaluate its accuracy.