An open-source implementation of the IEC/IEEE 62704-1 spatial-average SAR algorithm

Motivation: IEC 60601-2-33 standard limits the 10 g spatial-average SAR when local transmit RF coils are used. The IEC/IEEE 62704-1 standard defines a procedure for performing the spatial-averaging but open-source implementations of the procedure are not available. Goal(s): To provide a free, open-source implementation of the spatial-averaging procedure described in the IEC/IEEE 62704-1 standard. Approach: The spatial-average algorithm is coded in Python-C . Outcomes are verified using test data provided with the IEC/IEEE 62704-1 standard. Results: Outcomes comply with the IEC/IEEE 62704-1 standard requirements and computation times are found to be reasonable for all the investigated cases. Impact: The spatial-average SAR implementation enables average SAR computation compliant with IEC/IEEE 62704-1 without using commercial software. Typical applications include post-processing using circuit co-simulation, or to add this capability to EM solvers that lack this feature.