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Radiation detector

A radiation detector, radiation technology, applied in radiation measurement, radiation intensity measurement, instruments, etc., can solve the problem of reduced reliability of pixel values ​​of dark images, etc.

Pending Publication Date: 2019-09-20
CANON ELECTRON TUBES & DEVICES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the reliability of the obtained pixel values ​​of the dark image is reduced

Method used

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Embodiment Construction

[0021] Hereinafter, embodiments will be described with reference to the drawings. In addition, in each figure, the same reference numerals are assigned to the same components, and detailed description thereof will be appropriately omitted.

[0022] The radiation detector of this embodiment can be applied to various radiations such as γ-rays in addition to X-rays. Here, as an example, a case involving X-rays, which are typical of radiation, will be described as an example. Therefore, by replacing "X-ray" in the following embodiments with "other radiation", it can also be applied to other radiation.

[0023] In addition, the X-ray detector 1 exemplified below is an X-ray plane sensor that detects X-ray images that are radiographic images. The X-ray planar sensor is roughly divided into a direct conversion method and an indirect conversion method.

[0024] The direct conversion method is a method in which photoconductive charges (signal charges) generated inside a photoconduct...

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PUM

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Abstract

The present invention provides a radiation detector capable of improving the reliability of a pixel value of a dark image. According to one embodiment, a radiation detector includes detection parts detecting radiation directly or in cooperation with a scintillator, a controller reading out a signal charge from each detection part, a memory part storing an upper limit and a lower limit of a normal pixel value in a dark image preliminarily obtained and data about a temperature dependence of the upper and lower limits, and a temperature sensor measuring a temperature of the radiation detector. The controller reads out the signal charge from each detection part in a state of no intended radiation irradiation and images the dark image, acquires a temperature when the dark image measured by the temperature sensor is imaged, extracts the upper and lower limits corresponding to the acquired temperature from the memory part, and inspects a pixel value in the imaged dark image by using the extracted upper limit and the lower limit.

Description

technical field [0001] Embodiments of the present invention relate to a radiation detector. Background technique [0002] An example of a radiation detector includes an X-ray detector. For example, an X-ray detector is provided with a scintillator for converting incident X-rays into fluorescence; and a plurality of photoelectric conversion parts (corresponding to pixels of an X-ray image) for converting fluorescence from the scintillator into signal charges. an array substrate; a signal processing circuit for reading signal charges from each of the plurality of photoelectric conversion parts; and an image forming circuit for forming an X-ray image based on the read signal charges. In addition, a photoelectric conversion element that converts fluorescent light into signal charges; a thin film transistor that switches storage and release of signal charges; a storage capacitor that stores signal charges; and the like are provided in the photoelectric conversion section. [00...

Claims

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Application Information

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IPC IPC(8): G01T1/20G01T1/202
CPCG01T1/20G01T1/2018G01T1/202H04N5/32H04N25/63H04N25/673G01T1/208G01T1/2006
Inventor 金刚寺豊久
Owner CANON ELECTRON TUBES & DEVICES CO LTD