Patent ID: 8907294
Filing Date: 2014-12-09
Classification: A61B,G01T,H04N

Abstract:
1. An image pickup apparatus comprising: a detector configured to include a plurality of pixels which are arranged in a matrix, which are used to convert a radial-ray or a light beam into analog electric signals, and which are divided into at least first and second pixel groups; a signal processor configured to include a reading circuit unit which includes a first reading circuit electrically connected to the first pixel group and a second reading circuit electrically connected to the second pixel group and which reads the analog electric signals output from the detector on a row-by-row basis, an analog-to-digital (A/D) conversion unit which includes a first A/D converter electrically connected to the first reading circuit and a second A/D converter electrically connected to the second reading circuit and which converts the analog electric signals output from the reading circuit unit into digital data items and outputs the digital data items, and a digital data processing circuit which processes the digital data items; a storage unit configured to store information on nonlinearities of the first and second A/D converters; and a controller configured to control the signal processor, wherein the signal processor further includes a direct current potential control circuit which changes the direct current potentials in accordance with a control signal supplied from the controller, and wherein the controller controls the signal processor so that the signal processor performs a signal processing operation several times of adding direct current potentials to analog electric signals of certain pixels output from the reading circuit unit, supplying the resultant signals to the A/D conversion unit, and outputting digital data items to the digital data processing circuit while the direct current potentials are changed in accordance with the information stored in the storage unit, and an average processing operation of averaging the output digital data items corresponding to the certain pixels using the digital data processing circuit.