Digital and computer x-ray photography

1．CR

CR is x-ray digitization of more mature technology, is currently widely used at home and abroad.

CR system is used to record and read by a laser x-ray imaging information of imaging plate (imaging plate; IP) as a vector to x-ray exposure and processing the information read, digital or film images. Current CR systems provide and screen---photography the same resolution. CR system for General x-ray photography of digital information, so that the conventional x-ray photography of analog information directly into digital information; to improve the image resolution and display capabilities, a breakthrough in the conventional x-ray photography of inherent limitations; may use computer technology to implement various image postprocessing (post-processing) features, increase the level of information displayed; reducing x-ray radiation dose to reduce radiation injury; CR system access to digital information can be transferred to lower-archiving and communication system (picturearchiving and communicating system; PACS), the implementation of telemedicine (tele-medicine).

2．DR

DR is x-ray television system on the basis of the digital processing by computer, analog video signal through sampling, die/number conversion (analog to digit, A/D) directly into your computer to store, analyze and save.

X-ray image of high spatial resolution, wide dynamic range, the image you can observe the contrast ratio is below 1%, diameter greater than 2 mm objects, in patients measured surface x-ray dose only conventional photography 1/10. Quantum detection rate (detective quantum efficicncy; DQE) up to 60%. Digital x-ray information available computer for processing. Through improved image detail, reduce image noise, gray levels, contrast adjustment, image zoom, digital subtraction, shows that untreated image the invisible characteristics of the information. With the help of artificial intelligence techniques to images for quantitative analysis and feature extraction for computer-aided diagnosis.

Digital x-ray photography including selenium drum, direct digital x-ray photography (direct digital radiography; DDR), CCD (charge coupled device; CCD) camera array mode etc.

Digital images with high resolution, image sharpness and detail displays clear; radiation dose, exposure latitude Tai, and may act according to the clinical needs of various image processing, etc., can also be achieved without the film Department of Radiology, Department, hospital network to facilitate instruction and consultation.