Abstract #4058

Adaptive SAR mass-averaging to predict RF heating for B1 shimming in the presence of a hip implant for parallel transmit at 3T

Aurelien Destruel¹, Kieran O'Brien^2,3, Markus Barth³, Jin Jin¹, Feng Liu¹, and Stuart Crozier¹

¹School of Information Technology and Electrical Engineering, The University of Queensland, Brisbane, Australia, ²Siemens Healthcare Pty Ltd, Brisbane, Australia, ³Centre for Advanced Imaging, The University of Queensland, Brisbane, Australia

Parallel-transmit and B₁-shimming techniques may significantly reduce radiofrequency (RF) artefacts when imaging near metal implants at 3T; however, it is known that around metal implants the 10g-averaged specific-absorption-rate (SAR_10g) locations do not coincide with the location of maximum heating. In this work, we investigate the behaviour of the B₁field and RF heating around metal implants in a generic body coil at 3T as a function of shimming parameters using the adaptive SAR method we previously introduced as a fast estimate of temperature increase.

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