Fig. 2

An excised heart irradiated by the cerium anode X-ray system. a The image was obtained by the cerium anode X-ray system set at 100 kV, 50 mA, and 100 ms of tube voltage, current, and exposure time, respectively. A guide wire with a diameter of 100 μm (black arrow in Fig. 3a) is used for calibration to measure the vessel diameters. b This is a magnified image of (a). It shows many IMCAs from EPCA down to the third-order branches as indicated by the white delta symbol