阅读说明：本技术 X射线平板探测器及其图像校正方法 (X-ray flat panel detector and image correction method thereof ) 是由 赵斌 徐帅 庞净 于 2020-03-27 设计创作，主要内容包括：本公开公开了一种X射线平板探测器及其图像校正方法,显示区域中将部分像素设置伪像素,所有伪像素的位置坐标满足如下3个条件：(1)在同一坐标系中,所有伪像素的坐标位置与显示区域经过水平翻转后所有伪像素的坐标位置不相同；(2)且在同一坐标系中,所有伪像素的坐标位置与显示区域经过垂直翻转后所有伪像素的坐标位置不相同；(3)且在同一坐标系中,显示区域经过水平翻转后所有伪像素的坐标位置与显示区域经过垂直翻转后所有伪像素的坐标位置不相同。(The utility model discloses an X ray flat panel detector and image correction method thereof, sets up the false pixel with some pixels in the display area, and the position coordinate of all false pixels satisfies following 3 conditions: (1) in the same coordinate system, the coordinate positions of all the dummy pixels are different from the coordinate positions of all the dummy pixels after the display area is horizontally turned; (2) in the same coordinate system, the coordinate positions of all the dummy pixels are different from the coordinate positions of all the dummy pixels after the display area is vertically turned over; (3) and in the same coordinate system, the coordinate positions of all the dummy pixels after the display area is horizontally turned are different from the coordinate positions of all the dummy pixels after the display area is vertically turned.)

An X-ray flat panel detector comprising a display area and a bezel area, the display area comprising: a plurality of signal reading lines, a plurality of scanning lines and a plurality of pixels arranged in a matrix are arranged in a crossed manner; at least one pixel in the display area is a dummy pixel, and the dummy pixel is in a dark state when the flat panel detector acquires an image;

the position coordinates of all the dummy pixels satisfy the following condition:

in the same coordinate system, the coordinate positions of all the dummy pixels are different from the coordinate positions of all the dummy pixels after the display area is horizontally turned;

in the same coordinate system, the coordinate positions of all the dummy pixels are different from the coordinate positions of all the dummy pixels after the display area is vertically turned over;

and in the same coordinate system, the coordinate positions of all the dummy pixels after the display area is horizontally turned are different from the coordinate positions of all the dummy pixels after the display area is vertically turned.

The X-ray flat panel detector according to claim 1, wherein the number of the dummy pixels is greater than 1 and less than or equal to 5.

The X-ray flat panel detector according to claim 2, wherein all the dummy pixels are adjacently disposed in a row direction and/or a column direction.

The X-ray flat panel detector according to claim 2, wherein some of the dummy pixels in all of the dummy pixels are disposed adjacently.

The X-ray flat panel detector according to claim 2, wherein all of the dummy pixels are each not adjacent to each other.

The X-ray flat panel detector according to claim 1, wherein the coordinate positions of the dummy pixels are each set at a position of the display area near the bezel area.

The X-ray flat panel detector of any one of claims 1-6, wherein the pixel comprises: a photoelectric conversion unit and a thin film transistor; the photoelectric conversion unit is used for converting X-ray light into an electric signal and storing the electric signal; the first stage of the thin film transistor is connected with the output end of the photoelectric conversion unit, the second pole of the thin film transistor is connected with a signal reading line, and the grid electrode of the thin film transistor is connected with a scanning line; the thin film transistor is used for providing the signal output by the photoelectric conversion unit to the signal reading line under the control of the scanning line.

The X-ray flat panel detector according to claim 7, wherein in the dummy pixel, the first and second poles of the thin film transistor are directly electrically connected.

The X-ray flat panel detector according to claim 7, wherein in the dummy pixel, a gate of the thin film transistor is disconnected from the scan line.

The X-ray flat panel detector according to claim 7, wherein in the dummy pixel, the second pole of the thin film transistor is disconnected from the signal reading line.

The X-ray flat panel detector according to claim 7, wherein in the dummy pixel, a first pole of the thin film transistor is disconnected from the photoelectric conversion unit.

An image correction method of an X-ray flat panel detector according to any one of claims 1 to 11, comprising:

acquiring an initial image acquired by the flat panel detector;

positioning the direction of the initial image according to the position coordinates of the dark points in the initial image;

and repairing a pseudo pixel in the initial image, wherein the brightness of the pseudo pixel is determined according to the brightness of pixels around the pseudo pixel.

The image correction method according to claim 12, wherein the luminance of the dummy pixel is determined based on the luminance of the pixels around the dummy pixel, and specifically:

the luminance of the dummy pixel is equal to the average of the luminances of all the pixels adjacent to the dummy pixel.