Flat panel detector, X-ray imaging system and automatic exposure detection method

Abstract

The invention provides a flat panel detector, an X-ray imaging system and an automatic exposure detection method. The flat panel detector includes a first scintillator layer, an image sensor, an automatic exposure detection sensor, and a PCB. The flat panel detector, an X-ray source and a display device form the X-ray imaging system. The automatic exposure detection sensor clears charge in each pixel unit; the charge in each pixel unit is collected and a cumulative distribution function thereof is calculated, and a voltage value corresponding to a set probability of the cumulative distributionfunction serves as a reference value; if the reference value does not exceed a threshold voltage, it is determined that no X-ray is available, and it returns to clear; if the reference value exceedsthe threshold voltage, it is determined that the X-ray is available, and next clear, collection and comparison are executed; and if it is determined at least twice that the X-ray is available, an exposure request signal is sent to achieve automatic exposure detection. According to the flat panel detector, the X-ray imaging system and the automatic exposure detection method, full field detection inautomatic exposure detection is achieved, false triggering is reduced, the sensitivity is high, and image collection quality is effectively improved.

Description

technical field

[0001] The invention relates to the field of medical image diagnosis, in particular to a flat panel detector, an X-ray imaging system and an automatic exposure detection method. Background technique

[0002] X-ray photography utilizes the short-wavelength, easy-to-penetrate properties of X-rays, and the different characteristics of X-ray absorption by different tissues, and forms images by detecting the intensity of X-rays passing through objects. FPD (Flat Panel Detector), as the core component of the X-ray imaging system, is responsible for converting X-rays into electrical signals and recording images, which can be displayed on the display in due course or stored for subsequent reading.

[0003] Generally, the FPD includes a scintillator, an image sensor (Image Sensor), a control module, a signal processing module and a communication module. The scintillator absorbs X-rays and converts them into visible light; the image sensor is composed of a pixel array...

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