Patent ID: 6243440
Filing Date: 2001-06-05
Classification: A61B

Abstract:
A radiographic apparatus using a two-dimensional radiation sensor, comprising:a radiation generator for irradiating an examinee;said two-dimensional radiation sensor having detecting elements in a two-dimensional array for converting radiation transmitted through said examinee into charge signals, and switches connected to said detecting elements, respectively;a gate driving circuit for successively driving, column by column, said switches connected to said detecting elements of said two-dimensional radiation sensor;a signal reading circuit for transducing to voltages, amplifying and digitizing electric charges outputted from data lines of said two-dimensional radiation sensor;a control circuit for controlling said gate driving circuit and said signal reading circuit;a sequence controller for controlling a radiation generating sequence of said radiation generator to perform a monitoring radiography and a subsequent, production radiography with respective radiographic conditions; anda radiographic condition computing unit for computing a radiographic condition for said production radiography based on a ratio between a quantity of charges collected from said two-dimensional radiation sensor through said signal reading circuit in time of said monitoring radiography and a desired quantity of charges in time of said production radiography, and on system set values for said monitoring radiography and said production radiography, and applying said radiographic condition for said production radiography at least to said sequence controller.