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Radiation imaging detector with proportional charge gain during readout

一种辐射成像、检测器的技术，应用在辐射的测量、辐射强度测量、X /γ/宇宙辐射测量等方向，能够解决X射线图像不利等问题

Active Publication Date: 2019-01-11
福微视株式会社
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This noise is often referred to as TFT switching noise and is also detrimental for low signal or low radiation dose X-ray images
Therefore, such TFT switching noise is a significant disadvantage of systems employing thin film transistor arrays (TFTs) known in the art

Method used

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  • Radiation imaging detector with proportional charge gain during readout
  • Radiation imaging detector with proportional charge gain during readout
  • Radiation imaging detector with proportional charge gain during readout

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[0038] In this example, a positive voltage of 1 KV across 200 mm of selenium was used, resulting in an electric field of 5 volts / micron in most of the selenium layer. A potential of -50V was applied to the buried electrode (14). Such as Figure 7 As shown, in the case where the output data electrode (13) is connected to the charge amplifier (9), the potential of the data electrode is close to the zero volt range. A negative voltage of -50 volts was applied to the buried electrode (14). With this potential distribution, all electric field lines (20) starting from the top high voltage bias electrode terminate on the top surface of the third dielectric material (15) above the buried pixel electrode (14). Upon exposure to X-ray radiation, electron-hole pairs are generated in the selenium layer proportional to the intensity of the absorbed radiation. Electrons are driven by the electric field to the top high voltage electrode (19) and holes are driven by the electric field (20) ...

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Abstract

The invention relates to a two steps image capture panel for recording x-ray image information. More particularly, the invention relates to a method and an apparatus for directing the internal electric field to capture the x-ray image first on an insulating surface, avoiding charge injection noise from the insulating surface, and then re-directing the internal electrical field to transfer the image charge from the insulating surface to a conductive readout electrode with electric field sufficient for charge gain during image readout.

Description

technical field [0001] The present invention relates to a two-step image capture panel for recording X-ray image information. More specifically, the present invention relates to a method and apparatus for directing an internal electric field to first capture an x-ray image on an insulating surface, avoiding charge injection noise from said insulating surface, and then redirecting said internal electric field , to transfer the image charge from the insulating surface to the conductive readout electrode whose electric field is sufficient to obtain charge gain during the image readout phase. Background technique [0002] Digital radiography can be produced by capturing incident X-rays as image-wise modulated patterns of light intensity (photons) or as electrical charges using a layer of radiation-sensitive material. Depending on the intensity of the incident X-ray radiation, the absorbed energy is directly converted into charges by the X-ray photoconductor and directed to a re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/02G01T1/20G01T1/24
CPCH01L27/14632H01L27/14687G01T1/247H01L27/14676H01L27/14603G01T1/026G01T1/20181G01T1/241
Inventor 丹尼·立·人·李张铉皙
Owner 福微视株式会社