Quick SAR assessment using dual-plane amplitude-only measurement

Comparison Between Two Phase-Retrieval Methods for Electromagnetic Source Modeling

“…Phase-retrieval methods of different kinds can be found in the scientific literature [1,2,[4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Some of them [1,2,[4][5][6][7][8][9] are gradientbased and try to minimize a functional.…”

“…Other methods [10][11][12][13][14] instead aim to recreate the phase angles in an iterative fashion, by propagating field estimates back and forth between different surfaces. Algorithms that combine more than one method, have also been presented [15,16].…”

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

“…Method: The approach, illustrated in Fig. 1, is based on a dual-plane amplitude-only scan [5,6] of the electric field components generating amplitude distributions A 1;i and A 2;i . Here, i denotes either of the Cartesian components x, y, or z.…”

“…Fundamentals: A complex electric field component E 1;i at one plane is propagated to a parallel plane by [5,6] …”

“…Similar to [4], a prerequisite for good accuracy is that the fields have decayed sufficiently at the edges of the measurement planes. To improve convergence and avoid local minima [6,7], several phase distributions are used and finally a gradient search is applied. A more detailed description of the algorithm is given below.…”