Abstract #5443

Adaptive SAR mass-averaging compared against thermal simulations in the presence of a titanium hip prosthesis in 7T pTx MRI

Aurelien Destruel^1,2, Kieran O'Brien^2,3, Markus Barth², Jin Jin¹, Feng Liu¹, and Stuart Crozier¹

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

The lack of study and guidelines means there is currently no imaging of orthopaedic metal implants at 7T MRI. Local RF heating should preferably be monitored to ensure that no heating occurs close to the implant. SAR_10g is the current preferred method to monitor the patients’ local radiofrequency exposure. This study shows that keeping SAR_10g under recommended values does not ensure that heating remains under safe values close to a hip prosthesis when compared with the more relevant thermal simulations. A new adaptive SAR mass-averaging approach is introduced and gives more reliable prediction of the location and magnitude of heating.

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