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Abstract #2836

Image-Guided Radio-Frequency Gain Calibration for High-Field MRI

Elodie Breton1, KellyAnne McGorty1, Graham C. Wiggins1, Leon Axel1, Daniel Kim1

1Research Radiology - Center for Biomedical Imaging, New York University Langone Medical Center, New York, NY, United States

The purpose of this study was to develop a rapid, image-guided RF transmitter gain calibration procedure for high-field MRI and evaluate its performance through phantom and in vivo experiments at 3T and 7T. Using a single-shot TurboFLASH pulse sequence, a series of saturation-no-recovery images was acquired by varying the flip angle of the preconditioning pulse. In the resulting images, the signal null occurs in regions where the flip angle of the preconditioning pulse is 90, and the mean signal within a region-of-interest can be plotted as a function of the nominal flip angle to quantitatively calibrate the RF transmitter gain.