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. Author manuscript; available in PMC: 2014 Apr 20.
Published in final edited form as: IEEE Trans Med Imaging. 2012 Nov 27;32(2):460–473. doi: 10.1109/TMI.2012.2230185

Fig. 4.

Fig. 4

Left: 256 × 256 pixelized breast CT phantom used in the present study. Middle: same with ROI around microcalcifications shown magnified as inset. Right: the gradient magnitude image, which has a sparsity of 10019 nonzero pixel values.