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In vivo animal study. (a) Prior image with no contrast enhancement. (b) Sample target image to reconstruct. Demonstration of sparsity on (c) difference image (enhanced background) and (d) spatial gradient magnitude of difference image. Window levels were WL=40 HU and WW=350 HU for (a) and (b), WL=0 HU and WW=400 HU for (c), and WL=50 HU and WW=100 for (d).
