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Unclear lesions of (a) metastasis (L096), (b) focal fat/ focal fatty sparing (L291), (c) perfusion defect (L096), and (d) metastasis (L506). The reconstructed images using (i) regular dose FBP and (ii) quarter dose proposed method were compared. Yellow circles in (i) showed the lesions. Intensity range is 40 ± 200 HU.
