Patent ID: 7262399
Filing Date: 2007-08-28
Classification: A61B,H04N

Abstract:
1. An automatic exposure control method for an image produced on a solid-state image sensing device in which intensity of radiation light irradiated to an object to be examined from a radiation source for producing an image is feedback controlled, wherein the solid-state image sensing device comprises a picture element producing part where electric charges generated by way of photo-electric conversion when receiving exposure are stored as charge signals, and a dark current measuring part where a dark current is stored as charge signals without receiving exposure, and wherein said image is produced while performing radiography in a manner that the intensity of radiation light is feedback controlled so as to keep, within a predetermined density range, the amount value which is defined by removing the charge signals stored on a specified pixel element or a specified pixel element column in said dark current measuring part of said image sensing device from the charge signals stored on a specified pixel element or a specified pixel element column in said picture element producing part of said image sensing device.