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Material separation was applied to the polymethylmethacrylate three-material phantom. (a) Photon counting image (L∕W:0.01∕0.01 mm−1) and decomposed images of (b) PMMA (L∕W: 600∕1000 mg∕ml), (c) hydroxyapatite (L∕W: 200∕600 mg∕ml), and (d) iodine (L∕W: 10∕20 mg∕ml) are shown.
