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Abstract #3956

Optimization of the Nominal Flip Angle in Actual Flip Angle Imaging Using Phase Difference Information

Tsuyoshi Matsuda1, Ikuko Uwano1, Yuji Iwadate2, and Makoto Sasaki1
1Division of Ultrahigh Field MRI, Institute for Biomedical Sciences, Iwate Medical University, Iwate, Japan, 2Global MR Applications and Workflow, GE Healthcare Japan, Hino, Japan

Flip angles (FAs) might be underestimated during the actual FA imaging (AFI) method due to the aliasing phenomenon that occurs when the actual FAs exceeds 90°. To optimize nominal FA values for the AFI scan performed at 7 T, at which in-plane FA values markedly vary, we attempted to detect pixels showing erroneous FAs by comparing the phase difference between two types of AFI source images. AFI-FA maps with nominal FAs of ≥ 60° include substantial areas with FA underestimation, which is unsuitable for accurate FA measurements.

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