| 摘要 |
PROBLEM TO BE SOLVED: To provide an X-ray diagnostic apparatus which detects an obstacle located within an X-ray irradiation region when acquiring sensitivity information of an X-ray detector. SOLUTION: When acquiring sensitivity information of the X-ray detector 5, a control section 61 performs Fourier transformation on X-ray detection data (p15) extracted from lines diagonal to grid stripes and having an amount of one column, among X-ray detection data acquired by air photography, and converts the data into frequency space. When a peak appears in frequency response (p17), the control section determines that an object is detected within the X-ray irradiation space. Because a frequency range where a peak may appear can be estimated in advance from a moire frequency characteristics generated by gaps between the grid space and the sampling pitch, the control section 61 detects presence or absence of a peak by searching the estimated region. When a peak is detected within the estimated region, the control section 61 determines that the grid 4 is inserted and issues an alarm showing detection of the grid 4. COPYRIGHT: (C)2010,JPO&INPIT |
