Radiation imaging collection device and radiation imaging data collection method

Abstract

The invention belongs to radiation detection technology, which relates to a data acquisition device based on radiation imaging and a data acquisition method based on radiation imaging thereof. Wherein, the devise comprises a detector device, a main control device and a general computer, the detector device comprises at least a detector used to convert X rays to current signals, at least a switch integral pre-amplification module used to carry out integral pre-amplification for the current signals, at least a difference-value filter module used to reduce the noise of switching charge, at least an A / D conversion module and at least a data cache module; the main control device connects with the detector device through an interface circuit, communicates with the general computer , and carries out data transmission through an Ethernet interface. The invention has the advantages of accurate measurement, low noise, high precision, large dynamic range, simple circuit, high integration level, strong expandability, good anti-interference capability, high data transfer rate, simple communication protocol, and convenient use.

Description

technical field [0001] The invention relates to the technical field of radiation detection, in particular to a method and equipment for collecting and processing detector signals in a radiation imaging system. Background technique [0002] Rays will be absorbed when they pass through an object, and the absorption intensity is related to physical properties such as the density and thickness of the object. Radiation imaging systems use this physical principle to perform imaging. [0003] In the radiation imaging system, the detector converts the ray signal containing the information of the measured object into an easy-to-handle electrical signal, undergoes subsequent amplification, shaping and other processing, and performs analog-to-digital conversion, becomes a digital signal, and transmits it to the computer; The image processing subsystem processes these data to reconstruct the detected perspective image. [0004] The detector signal contains the information of the measur...

AI Technical Summary

Problems solved by technology

The measurement error of this data acquisition method is mainly manifested in the following points: the feedback resistance noise of the RC feedback preamplifier; the ballistic loss of the forming circuit; the measurement error caused by the inability of the sample-and-hold circuit to accurately sample at the pulse peak; The analog transmission of the preamplifier signal will cause transmission interference

In addition, the traditional data acquisition system uses 16-bit A / D. When the signal-to-noise ratio of the analog circuit is higher than 16-bit, the quantization noise of the A / D will also become the main factor affecting the overall signal-to-noise ratio of the system.

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