| 摘要 |
PURPOSE:To provide a correct radiographing timing, by distributing successively and alternately image signals on a horizontal scanning line frame by frame to two integrators, integrally retaining said signals in their respective integrators, comparing the thus-retained signals and then conducting an X-ray irradiation in accordance with the comparison results. CONSTITUTION:An X-ray SX irradiated from an X-ray tube unit 11 reaches an image intensifier 15 through a person 12 under examination and grid 13. A pulse control circuit is fed with a vertical synchronising signal S2 and horizontal synchronising signal S3, as well as a signal S4 from a setting switch 21. Thereafter, the pulse control circuit outputs the first integration command signal S5, second integration command signal S6, first integration resetting signal S7 and second integration resetting signal S8 into an image signal gate circuit 22, where an image differential signal S10 is then produced and transmitted to a command generating circuit 23, which determines an X-ray radiographing timing. |
