Further Reduction of SAR For T2-Weighted Hyper-TSE Imaging At 7 Tesla

K. A. Danishad¹, Niravkumar Darji¹, Oliver Speck¹

High RF power deposition caused by multiple 180⁰ refocusing pulses is a major limitation of TSE sequences in ultra high field MR imaging. In this study, the flip angle variation of the hyper-TSE sequence was optimized to further reduce SAR. T₂-contrast and image artifacts of the modified hyper-TSE sequence were compared with standard TSE and hyper-TSE sequences. Our results indicate that the hyper-TSE sequence with further reduced FA can be used in high-field systems without compromising the T₂-contrast and SNR and with the benefit of increased coverage or reduced SAR.