Method for controlling radiation image pickup apparatus, radiation image pickup apparatus, and radiation image pickup system

摘要

A radiation image pickup apparatus includes a pixel array having pixels each including a conversion element and a switch element, a drive circuit for controlling the switch element between a conducting state and a non-conducting state, a detection unit for outputting a detection signal varying with the intensity of irradiation of the pixel array, and an arithmetic unit for calculating a start threshold value used to detect start of irradiation based on the signal output from the detection unit during a period when radiation is not emitted onto the pixel array in which the switch elements are sequentially set in a conducting state on a row-by-row basis by the drive circuit and the signal output from the detection unit during a period when radiation is emitted onto the pixel array in which the switch elements are sequentially set in a conducting state on a row-by-row basis by the drive circuit.

主权项

1. A method for controlling a radiation image pickup apparatus, the radiation image pickup apparatus including a pixel array having a plurality of pixels arranged in a matrix, a drive circuit, and a detection unit, each of the pixels including a conversion element and a switch element and converting radiation into an electric signal, the drive circuit controlling the switch element between a conducting state and a non-conducting state, the detection unit outputting a signal varying with an intensity of irradiation of the pixel array, the method comprising:
switching the radiation image pickup apparatus between a first mode and a second mode, wherein in the first mode, a start threshold value used for detecting start of irradiation of the pixel array is calculated on the basis of the signal output from the detection unit during a period of time during which irradiation is not applied to the pixel array in which the switch elements of the plurality of pixels are sequentially set in the conducting state on a row-by-row basis by the drive circuit and the signal output from the detection unit during a period of time during which irradiation is applied to the pixel array in which the switch elements of the plurality of pixels are sequentially set in the conducting state on a row-by-row basis by the drive circuit, and wherein in the second mode, the switch elements of the plurality of pixels are set in the non-conducting state by the drive circuit if a value of the signal output from the detection unit exceeds the start threshold value during a period of time during which the switch elements of the pixels are sequentially set in the conducting state on a row-by-row basis by the drive circuit after the first mode occurs.