| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a radiation apparatus capable of creating an offset image in which a grid pattern is left.SOLUTION: When strong direct X-rays are incident on a flat panel type X-ray detector (FPD), random noise such as granular noise or vertical stripe noise appears in an offset image acquired after the acquisition of an X-ray image together with a grid pattern by a grid. Therefore, a bandpass filter in the neighborhood of a frequency corresponding to the grid pattern and a low-pass filter making a frequency band lower than the neighborhood of the frequency corresponding to the grid pattern pass are applied to offset data. Thereby, the noise such as the granular noise or the vertical stripe noise is removed, and the offset image in which the grid pattern is left (grid data) can be created.</p> |
