| 摘要 |
The disclosure provides a radiographic apparatus that allows suppression of needles radiation exposure to a subject. Specifically, the disclosure includes an X-ray tube 3, a collimator 3a, and a visible light source 9. The spread of visible light beams through the collimator 3a opening too largely may not possibly conform to the spread of radiation. Such a situation may occur when the apparatus is provided with the X-ray tube 3 that emits narrow radiation. In order to avoid such a situation, the disclosure sets an upper limit of a degree of opening as an upper limit of a degree of opening of the collimator 3a. With a construction of the disclosure, there is no need to perform further radiography. This achieves the radiographic apparatus that allows suppression of needless radiation exposure to a subject M. |
