Abstract #3691

Simultaneous multi-slice imaging reduces sensitivity of local-SAR to patient motion at 7T

Emre Kopanoglu¹, Cem M. Deniz², and Richard G. Wise^1,3

¹CUBRIC, School of Psychology, Cardiff University, Cardiff, United Kingdom, ²Department of Radiology, New York University Langone Health, New York, NY, United States, ³Institute for Advanced Biomedical Technologies, University of Chieti-Pescara, Chieti, Italy

This study investigates the effect of within-scan patient motion on local-SAR for simultaneous multi-slice (SMS) imaging at 7T. A virtual body model was simulated at 104 different positions. 1-/2-/3-spokes pulses were designed to excite a region of 60 slices covering the cerebellum and the brain, using SMS-factors of 1 through 5. Local-SAR was observed to increase by up to 2.75-fold due to patient motion. Pulses with higher SMS-factors were up to 50% less sensitive against changes in local-SAR due to patient motion, compared to SMS:1 pulses. Pulses with higher SMS-factors yielded more consistent local-SAR throughout the scan.

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