A kind of X-ray image sensor and method for eliminating image afterimage

Abstract

The invention provides an X-ray image sensor and a method for eliminating image sticking, comprising: connecting two TFT switches to each pixel, designing a single scanning line between pixel rows, and designing two readout lines between pixel columns to realize A row of pixels is independently controlled by the upper and lower scanning lines; the upper side readout circuit is responsible for bright field image reading, and the lower side release circuit is responsible for clearing residual information in dark field. Since the readout and release operations on the upper and lower sides are carried out synchronously, but the spatial physical positions differ by one line, after a frame of bright field image is collected, the residual image information of the dark field is correspondingly cleared once. The present invention clears the lag information of the current frame image while collecting the current bright-field image; does not increase a separate clearing operation and additional clearing time; can be used under static or dynamic acquisition conditions, effectively improving image acquisition frequency and image quality .

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 afterimages. 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 ...

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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 a method for eliminating image sticking, which are used to solve the problem that lag sticking affects image quality in the prior art

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