| 摘要 |
PROBLEM TO BE SOLVED: To easily measure an external magnetic field having an effect on imaging with an X-ray imaging apparatus.SOLUTION: A relation between a feature quantity of a magnetic field image, containing a position of the magnetic field image and a pixel value obtained at the position, and a direction of a magnetic field generation source H when viewed from an X-ray imaging apparatus 100 is stored in advance in a database 114. Thereafter, the direction of the magnetic field generation source H when viewed from the X-ray imaging apparatus 100 is specified, based on a relation between a magnetic field image prepared from a dark image captured with the X-ray imaging apparatus 100 and the relation stored in the database 114. |
