Patent ID: 9131908
Filing Date: 2015-09-15
Classification: A61B

Abstract:
1. An X ray diagnostic apparatus comprising: an X ray tube configured to generate X rays; an X ray detector configured to detect X rays generated from the X ray tube and transmitted through a subject; an aperture variable collimator mechanism configured to limit a radiation field of X rays from the X ray tube; an image generation unit configured to repeatedly generate a first X ray image based on an output from the X ray detector during a period in which an aperture of the collimator mechanism is a first aperture size and to repeatedly generate a second X ray image based on an output from the X ray detector during a period in which the aperture is a second aperture size smaller than the first aperture size; a display unit configured to display a latest second X ray image of the repeatedly generated second X ray images and a specific first X ray image of the repeatedly generated first X ray images as a dynamic image in real time for the second X ray image is generated; an input unit configured to switch between an ON state and OFF state of an ROI fluoroscopy mode; and a control unit configured to enlarge the aperture of the collimator mechanism from the second aperture size to the first aperture size by controlling the collimator mechanism every time the ROI fluoroscopy mode is switched to the ON state via the input unit to update the first X ray image.