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The geometry of a cylindrical object, and true and reconstructed x–y sectional images of the ICG concentration normalized by their maxima for Case (i). True images (first column), reconstructed images using the Tikhonov regularization (second column) and using the lp sparsity regularization with p = 1 (third column) and p = 0.5 (fourth column) for the depths of the true target being 4 mm (top row), 6 mm (middle row) and 9 mm (bottom row).
