Radiation imaging system, method for taking continuous radiographic image, and radiation image detecting device

摘要

In continuous radiography, while a patient stands in front of an imaging support, a total image capture field is determined. The total image capture field is divided into small image capture fields. A map scaling section scales up or down a full spine irradiation area map in accordance with the size of the total image capture field. A map dividing section divides the scaled map into small maps corresponding to the small image capture fields. In each division exposure, a detection pixel selector selects one or more detection pixels belonging to an irradiation area defined by the small map, out of all detection pixels distributed in an imaging surface of an electronic cassette. If an integration value of a detection signal from the selected detection pixel reaches a threshold value, X-ray emission is stopped. Division X-ray images obtained by the division exposures are merged into a single continuous X-ray image.

主权项

1. A radiation imaging system for dividing a total image capture field into N integer number of small image capture fields, and producing a single continuous radiographic image from N number of division radiographic images obtained by division exposures of said small image capture fields, said radiation imaging system comprising:
a radiation source for emitting radiation to each of said small image capture fields; a radiation image detecting device having a detection panel having an imaging surface having an arrangement of a plurality of pixels, said detection panel detecting said radiation that has passed through a body part of said small image capture field to produce said division radiographic image; a plurality of dose detection sensors substantially uniformly distributed in said imaging surface, each for measuring a radiation dose; a memory for storing an irradiation area map that defines as an irradiation area an area for measuring said radiation dose in accordance with said body part to be imaged; a map scaling section for scaling up or down said irradiation area map so as to make said irradiation area map coincide with said total image capture field in size; a dose detection sensor selector for selecting one or more of said dose detection sensors belonging to said irradiation area based on said irradiation area map that has been scaled up or down by said map scaling section; and an automatic exposure controller for automatically controlling a radiation exposure in each of said division exposures, said automatic exposure controller stopping emission of said radiation from said radiation source in accordance with a measurement value obtained from a detection signal of said dose detection sensor selected by said dose detection sensor selector.