Abstract #1327

Squeezed Variable Density Spiral Trajectory for SAR Reduction in Parallel Transmission 2D RF Design

Qing Li¹, Congyu Liao¹, Huihui Ye¹, Ying Chen¹, Hongjian He¹, Qiuping Ding¹, and Jianhui Zhong¹

¹Center for Brain Imaging Science and Technology, Department of Biomedical Engineering, Zhejiang University, Hangzhou, Zhejiang, People's Republic of China

A squeezed variable density spiral (SVDS) trajectory was proposed to reduce SAR and peak RF power in 2D RF pulse design using parallel transmission (pTX). SVDS was generated by applying a pointwise squeezing factor to conventional variable density spiral (CVDS) trajectory. Compared to CVDS, SVDS can reduce peak RF and SAR by close to 40%, with minimal increase in the normalized root mean square error (NRMSE) of the excitation profile and pulse duration.

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