X-ray image detector capable of realizing automatic gain switching and method thereof

Abstract

The invention discloses an X-ray image detector capable of realizing automatic gain switching and a method thereof. The image detector comprises a detection module, a selection switch, a control module, a plurality of charge amplifiers, and a signal processing module. According to the image detector, prediction value detection is carried out on X-ray effective doses of image gray values of all charge amplifiers under all charge gain grades in extremely-low and saturated states so as to obtain minimum values and maximum values of the X-ray effective doses corresponding to all charge gain grades; and thus when normal shooting is carried out, the selection switch is controlled to be switched at a charge gain grade corresponding to a measured X-ray effective dose based on the measured X-ray effective dose. Therefore, automatic, accurate and efficient imaging is realized; the saturation or low-brightness state of the image is prevented; the image quality is improved; the bad film rate is reduced; and thus a phenomenon that the patient is radiated repeatedly is avoided.

Description

technical field [0001] The invention relates to an X-ray image detector realizing automatic gain switching (hereinafter referred to as X-ray image detector), and also relates to a corresponding automatic gain switching method, which belongs to the technical field of radiation imaging. Background technique [0002] The X-ray imaging system uses an X-ray detector to receive directly projected X-rays to form images. If quantum noise is not considered, the ideal state is that when an X-ray point source is directly irradiated on the detector, the signal received by the ideal detector is like a spatially uniform image (usually a simple median or low-pass filter can be used method to reduce quantum noise). Since the sensitivity of each pixel unit on the actual detector to receive signals is different, the brightness of the formed image is not uniform. [0003] When acquiring X-ray images, due to the difference in X-ray intensity, it is easy to appear that the brightness of the ou...

AI Technical Summary

Problems solved by technology

Since the sensitivity of each pixel unit on the actual detector to receive signals is different, the brightness of the formed image is not uniform

[0003] When acquiring X-ray images, due to the difference in X-ray intensity, it is easy to appear that the brightness of the output image under the current integral gain is too low or saturated, thus affecting the imaging effect

Although the existing X-ray detectors can be set with integral gain files, they are all pre-set during use and cannot be changed during the image acquisition process, which causes the image brightness to be known only after the X-ray output is completed.

If the brightness of the collected image is saturated or too low, it is necessary to adjust the X-ray intensity or the integral gain file to re-acquire the image, thus causing the patient to be repeatedly irradiated

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