METHOD OF EVALUATING ALIGNMENT BETWEEN X-RAY SOURCE AND SCATTERED RAY REMOVING GRID, AND FEEDBACK METHOD, FEEDBACK DEVICE, X-RAY RADIOGRAPHY AND X-RAY RADIOGRAPHIC DEVICE

摘要

PROBLEM TO BE SOLVED: To eliminating the need for a hardware and evaluate the accuracy of alignment even if an obstacle exists between a grid cassette and a X-ray source. SOLUTION: This alignment evaluating method for evaluating the accuracy of alignment between the X-ray source and a scattered X-ray removing grid comprises a radiography step (S1) of radiographing a X-ray image, a computation step (S2) of computing the contrast of the scattered X-ray removing grid for every region on the radiographed X-ray image, and evaluation steps (S3, S4) of analyzing the profile of the computed contrast and evaluating the accuracy of alignment between the X-ray source and the scattered X-ray removing grid.