Radiation image detecting device and method for detecting start of irradiation

摘要

An FPD, being offline from an X-ray source, detects X-ray irradiation from the X-ray source to detect an X-ray image. The FPD includes pixels arranged in two dimensions, scan lines corresponding to respective rows of the pixels, signal lines corresponding to respective columns of the pixels, and switching elements provided to the respective pixels to allow performing accumulation operation or readout operation. At least one of the pixels is used as a detection pixel to detect a start of the X-ray irradiation. First and second voltage signals are obtained successively through the signal line to which the detection pixel is connected. The start of the X-ray irradiation is judged based on a difference between the first and second voltage signals.

主权项

1. A radiation image detecting device for imaging a subject irradiated with radiation from a radiation source to obtain a radiological image, the radiation image detecting device comprising:
a plurality of pixels arranged in two-dimensions along row and column directions in an imaging area, each pixel of the plurality of pixels generating signal charge corresponding to an amount of the radiation incident on the pixel, each pixel of the plurality of pixels having a switching element for controlling reading of the signal charge; a plurality of scan lines extending in the row direction, each scan line of the plurality of scan lines being connected to gate electrodes of the respective switching elements of the corresponding pixels; a plurality of signal lines extending in the column direction, each signal line of the plurality of signal lines being connected to the corresponding pixels through the switching elements; a drive section for turning off the switching element of the pixel to allow performing accumulation operation and for turning on the switching element of the pixel to allow performing readout operation, the signal charge generated in the pixels being accumulated in the accumulation operation, the signal charge accumulated being read out through the signal line connected to the pixel in the readout operation; and a controller using at least one of the plurality of pixels as a detection pixel for judging start of irradiation with the radiation, the controller successively obtaining two output values, being first and second signal values, from the signal line connected to the detection pixel, the controller judging whether the irradiation with the radiation is started based on a difference between the first and second signal values, the controller controlling the drive section based on the judgment.