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radiation detector

A radiation detector, radiation technology, used in radiation measurement, radiation intensity measurement, instruments, etc., can solve problems such as unrealistic, large minimum wiring width, and practicality, to improve S/N ratio and suppress dynamic range. the reducing effect of

Inactive Publication Date: 2011-12-21
FUJIFILM CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, it is not practical to incorporate a current-voltage conversion circuit into a TFT for the following reasons
[0010] (1) It is difficult to perform current-voltage conversion with high accuracy due to the uniformity of threshold value of TFT, manufacturing stability and low reliability
[0011] (2) Since the minimum wiring width of the specifications of the manufacturing device is large (CMOS≤0.1μm, TFT is approximately equal to 5μm), for current-voltage conversion, CMOS requires more than 100 times the area
[0012] Therefore, although it has been proposed to provide a current-voltage conversion circuit in the pixel of the radiation detector, it is difficult to put this technology into practice

Method used

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Embodiment Construction

[0052] Hereinafter, exemplary embodiments for realizing the present invention will be described with reference to the accompanying drawings.

[0053] [First Exemplary Embodiment]

[0054] figure 1 The overall structure of the radiation image imaging apparatus 100 according to the first exemplary embodiment is illustrated.

[0055] like figure 1 As shown, the radiation image imaging apparatus 100 according to the first exemplary embodiment includes an indirect conversion type radiation detector 10 .

[0056] The radiation detector 10 is provided with a direction ( figure 1 The horizontal direction in , hereinafter referred to as the "row direction") and the direction crossing the row direction ( figure 1 The vertical direction in (hereinafter referred to as "column direction") is arranged to form a plurality of pixels 7 in a 2-dimensional shape. Each pixel 7 is configured to include two sensor sections 103A and 103B and TFT switches 4A and 4B. These two sensor section...

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Abstract

The present invention provides a radiation detector that can suppress reduction in dynamic range and that can improve the S / N ratio at low radiation doses. That is, a plurality of pixels are provided with sensor sections each having different photosensitive characteristics, the sensor sections generate charges in response to irradiation of radiation and accumulate charges corresponding to the amount of irradiated radiation. A control signal flows through the switching element provided for each pixel through the scanning line. An electric signal corresponding to the charge accumulated in the sensor portion of each pixel flows through the signal line according to the switching state of each switching element.

Description

technical field [0001] The present invention relates to a radiation detector. The present invention specifically relates to a radiation detector having a plurality of pixels arranged in a matrix, in which charges generated by irradiation of radiation are accumulated, and the accumulated charge amount is detected as image information. Background technique [0002] Radiological imaging apparatuses have recently been realized using radiation detectors, such as FPDs (Flat Panel Detectors), which have an X-ray sensing layer provided on a TFT (Thin Film Transistor) active matrix substrate and directly convert X-ray information into digital information. radiation detector. Such a radiation detector has an advantage over related imaging panels in that images can be inspected more rapidly, and video images can also be inspected. The introduction of such radiation detectors is rapidly spreading. [0003] Various types of such radiation detectors have been proposed. For example, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/20
CPCH04N5/32G01T1/2018H04N5/35563H04N25/585G01T1/20184H04N25/30
Inventor 冈田美广
Owner FUJIFILM CORP