Patent ID: 9678226
Date: 2017-06-13
CPC Classifications: G01T,H04N

Claim:
1. A radiographic image detector comprising: an imaging device for detecting a radiographic image of a subject from radioactive rays that penetrate through the subject after being radiated from a radiation source, said imaging device having an imaging area in which pixels are arranged in a matrix to accumulate signal charges corresponding to incident amounts of the radioactive rays therein, and scanning lines for driving said pixels and signal lines for reading out the signal charges from said pixels to output the radiographic image are provided in correspondence with lines and columns of said pixels respectively; a driving device for outputting drive signals to said scanning lines to turn switching elements of said pixels ON and OFF to execute a pixel resetting operation, a charge accumulating operation for accumulating the signal charges in said pixels, and a first and a second reading operations, said switching elements being turned ON in said pixel resetting operation to read out dark charges through said signal lines, the dark charges being generated in said pixels regardless of the radioactive rays, said switching element being turned OFF in said charge accumulating operation, charge leaks from said pixels to said signal lines while said switching elements are OFF being read out in said first reading operation, and said switching element being turned ON in said second reading operation to read out the signal charges through said signal lines for each line of said pixels, the amount of the charge leaks corresponding to the dark charges and the signal charges accumulated in said pixels; a radiation detecting device for making a radiation detecting operation for detecting the start of radiation of the radioactive rays by said first reading operation; and a control device for controlling said radiation detecting device and said driving device to start said radiation detecting operation by turning said switching elements OFF before starting said charge accumulating operation, and to start said second reading operation after said radiation detecting device detects the start of radiation of the radioactive rays and the charge accumulating operation is ended, wherein each of said pixels includes a single one of said switching elements that is connected to one of said scanning lines and one of said signal lines, and wherein each of said switching elements is directly connected to one of said scanning lines and one of said signal lines.