A robust phase-retrieval method with stable convergence and back-propagation properties for quick experimental whole body specific absorption rate (SAR) assessments is presented.

A combination of a fast and coarse method and a more accurate gradient-based method is used to optimise the overall performance.

To prevent the solution being trapped in a local minimum, several initial phase distributions are used. An accurate measurement procedure has been developed which reduces measurement time by roughly a factor of 2.5-4 at common mobile communication frequencies compared with a volume scan based procedure.


Jonas Fridén, H. Isaksson, Björn Hansson, Björn Thors

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Robust phase-retrieval for quick whole-body SAR assessment using dual plane amplitude-only data

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