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Effect of phantom size on normalized L-curve performance. Coil size, HPM thickness and position were kept constant for all cases. UISAR, depicted in arbitrary units determined by the simulation method, decreases for decreasing sphere sizes (A), and this trend also appears in the L-curves for a 48-element array (B). When the optimal relative permittivity for the largest sphere size is chosen, all sphere sizes continue to show substantial improvement over the case without HPM (C).
