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An X-ray image sensor and its method for eliminating image afterimage

An image sensor and X-ray technology, which is used in radiological diagnosis instruments, radiation detection devices, medical science, etc.

Active Publication Date: 2019-06-11
SHANGHAI IRAY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide an X-ray image sensor and its method for eliminating image sticking, which is used to solve the problem that lag sticking affects image quality in the prior art

Method used

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  • An X-ray image sensor and its method for eliminating image afterimage
  • An X-ray image sensor and its method for eliminating image afterimage
  • An X-ray image sensor and its method for eliminating image afterimage

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Experimental program
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Embodiment 1

[0055] Such as image 3 As shown, the present invention provides an X-ray image sensor 1, and the X-ray image sensor 1 includes at least:

[0056] The pixel array 11 , the first scan driving circuit 121 , the second scan driving circuit 122 , the readout circuit and the release circuit.

[0057] Such as image 3 As shown, the pixel array 11 includes a plurality of pixel units, and in this embodiment, the pixel array 11 is a 4×4 array. Each pixel unit includes a first TFT switch TFT1 , a second TFT switch TFT2 and a photodiode PD. The first electrode of the first TFT switch TFT1 is connected to the readout circuit, the second electrode is connected to the cathode of the photodiode PD, and the third electrode is connected to the first scanning drive circuit 121; the second TFT switch TFT2 The first electrode of the photodiode is connected to the release circuit, the second electrode is connected to the cathode of the photodiode PD, and the third electrode is connected to the ...

Embodiment 2

[0071] Such as Figure 3 ~ Figure 4 As shown, the present invention also provides a method for eliminating image persistence, the method for eliminating image persistence at least includes:

[0072] Step S1 : before exposure, the second scan driving circuit 122 outputs a driving sequence to clear the residual charge in the pixel unit.

[0073] Specifically, in this embodiment, the X-ray image sensor 1 is used as the hardware basis. Such as image 3 As shown, before exposure, the second scan driving circuit 122 outputs a driving sequence to turn on the second TFT switch TFT2 in each pixel unit row by row, so as to clear the residual charge and leakage information in each pixel unit.

[0074] Step S2: stop the output driving sequence, and perform the exposure operation.

[0075] Specifically, such as image 3 As shown, the first scanning driving circuit 121 and the first scanning driving circuit 122 stop output driving timing, and each first TFT switch TFT1 and each second T...

Embodiment 3

[0084] Such as image 3 and Figure 5 As shown, the present embodiment provides a method for eliminating image sticking, and both the present embodiment and the second embodiment use the X-ray image sensor 1 as the hardware basis. The difference is that, in this embodiment, the bright-field images in the pixel units of each row are sequentially read out row by row, and at the same time, the dark-field residual charges are released for the pixel units that have collected the bright-field images.

[0085] Specifically, the method for eliminating image sticking includes at least:

[0086] Step S1': Before exposure, the second scan driving circuit 122 outputs a driving sequence to clear the residual charge in the pixel unit.

[0087] Specifically, such as image 3 As shown, before exposure, the second scan driving circuit 122 outputs a driving sequence to turn on the second TFT switch TFT2 in each pixel unit row by row, so as to clear the residual charge and leakage information...

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Abstract

The invention provides an X-ray image sensor and a method for eliminating a ghost image by the X-ray image sensor. The X-ray image sensor comprises the following structure: each pixel is connected with two TFT (Thin Film Transistor) switches; two scanning lines are designed between pixel lines; two reading lines are designed between pixel arrays; scanning and reading of a bright-field image and a dark-field image can be carried out separately; an upper-side reading circuit is responsible for reading the bright-field image, and a lower-side releasing circuit is responsible for eliminating dark-field residual information. In a bright-field signal image acquisition process, the difference between a bright-field image scanning row and dark-field image charge releasing is one row or n rows of time, so that the charge releasing of the corresponding dark-field image is finished for one time or a plurality of times when the bright-field image is acquired. When the bright-field image is acquired, image lag information can be eliminated for one time or a plurality of times at the same time; independent clearing operation and extra clearing time are not increased; the X-ray image sensor can be used under a static acquisition condition or a dynamic acquisition condition, and the image acquisition frequency and the image quality are effectively improved.

Description

technical field [0001] The invention relates to the field of medical image diagnosis, in particular to an X-ray image sensor and a method for eliminating image sticking. Background technique [0002] X-ray digital photography technology has been more and more widely used in the field of medical imaging diagnosis today. Among various X-ray digital photography equipment, X-ray detector is the most core and key component with the highest technical content in this type of equipment. It plays an indispensable key role in the imaging acquisition process of the entire image. [0003] Amorphous silicon X-ray flat panel detector mainly consists of X-ray incident surface (usually carbon plate material), scintillator, X-ray image sensor, signal integral reading circuit, structural shell and other parts. [0004] The imaging process of the X-ray detector needs to go through the transformation process from "X-ray" to "visible light" to "electron". Such as figure 1 As shown, during the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B6/00
CPCA61B6/42A61B6/5258
Inventor 于祥国方志强
Owner SHANGHAI IRAY TECH
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