Fig. 4

An excised heart irradiated by the cerium anode X-ray system with a 20-cm-thick acrylic plate. a The image was obtained by the rotating cerium anode X-ray system set at 100 kV, 50 mA, and 1000 ms of tube voltage, current, and exposure time, respectively, after placing a 20-cm-thick acrylic plate between the X-ray tube and the excised heart. b This is a magnified image of (a). The third-order branches were sufficiently visualized as indicated by the white arrow