Core Tip: For these two different systems, from system functionality, image quality, and control the use of software functionality to analyze several aspects

(1) System Feature Comparison: CR is in a traditional X-ray film imaging means improved from, it is the use of IP board replaces the original film cartridge, no major changes to existing X-ray film systems, IP board after X-ray exposure, the image information stored in IP board,The IP board (similar to cassette) to send readout means for reading out the treatment, the transformation of existing equipment, DR is a complete digital product, completely changed the traditional X-ray film photography process, flat panel detector (FPD) by X-ray instant X-ray exposure of the converted signal into a digital signal sent to the computer for processing, the device is a new digital X-ray machine.

(2) Image quality comparison: spatial image resolution CR> 3.5LP / mm, DR> 3.6LP / mm; density resolution CR> 212 gray, DR.214 gray, DR of FPD display information> CR of IP board, DR modulation transfer function (MTF) greater than CR.

(3) action, currently used in hospitals CR, DR has been more popular, with incomplete statistics, the use of conventional screen-film X-ray of each patient on average 7.5min / person, using CR photography needs 6 min / person, while the use of DR photography needs 2.5 min / person,CR can easily compare with the original X-ray photography systems with the use of X-ray machine, especially in a complex position photography available ICU, emergency room and other special departments, and DR systems are more suitable for fluoroscopy and spot film, photography and a variety of angiography.

(4) software features, CR, DR software features from different manufacturers of different types of equipment and software features Datong small, it is based on the quality control of the quality and stability of touch block and post-processing technology to ensure images, DR with automatic exposure control techniques (Automatic Exposure Control, AEC),The main principle is by setting different detectors (ionization chamber), measured by X-ray exposure dose when the patient, image acquisition After reaching the required dosage, automatically shut down the X-ray system to ensure the consistency of the whole image resistance,After quickly get a digital image, the image can be immediately digitally optimized. Rather like a conventional film coming out after only know the image is good or bad, the probability of patients because the problem is a remake of the image is greatly reduced, but also to avoid receiving unnecessary patient X-ray exposure, reducing the radiation dose received. By AEC technology, with its multiple processing touch-type on the workstation, so image quality is stable, and the operation is simple, without artificial adjustment and processing.

CR's burst index (Exposure Index, EI) reference value is an important parameter affecting the quality of different parts with different EI and EVP values in order to achieve high-quality images.Since the filming process and post-image processing is not directly related, to get better picture quality, but also requires a certain projection technology and experience, equipment operability and image quality can stability than the DR to be worse .