What is the difference between X-ray diagnostic system and DR?

1, the density resolution is different. The density resolution of X-ray diagnosis system photos can only reach 26 gray levels, while the density resolution of DR digital images can reach 2 10- 12 gray levels.

2. The post-processing function is different. Post-processing of DR image is relative to analog X-ray imaging. As long as there are original data, the image can be processed according to the needs of diagnosis through software functions, and the diagnosis rate can be improved. But X-ray photography needs special photographic film to be processed.

3. The functions of storage, retrieval, transmission or copying are different. Digital images can be stored in disks, tapes, optical disks and various memory cards, and can be accessed and transmitted at any time; X-ray diagnostic system does not have this function.

4. The imaging speed is different. Because the DR system has changed the traditional photography and imaging methods, digital images can be obtained in 10 seconds after exposure, which greatly improves the work efficiency. However, the X-ray diagnosis system can only be processed after the film comes out, which is relatively slow.

5. The radiation dose is different. The x-ray dose detected by DR is only 0.20 roentgen; In the X-ray diagnosis system, the X-ray dose of ordinary screen combined with chest film reaches 10.67 roentgen.

Extended data

Application scope of X-ray diagnostic system

X-ray examinations commonly used in nervous system include skull plain film, cerebral angiography, CT, myelography and so on. X-ray examinations commonly used in circulatory system include cardiac fluoroscopy, cardiac telephoto and angiocardiography; The commonly used X-ray examinations of digestive system include gastrointestinal radiography, X-ray photos and radiography of biliary system, CT examination of liver, B-ultrasound, CT or angiography of pancreas;

Common X-ray examinations of urinary system include abdominal plain film, intravenous urography and retrograde pyelography? Renal arteriography and CT; X-ray examination commonly used in sports system includes X-ray fluoroscopy, X-ray plain film, tomography, angiography, arthrography, myelography and CT. X-ray examinations commonly used in obstetrics and gynecology include abdominal plain film, hysterosalpingography and pelvic inflatable radiography.

Disaster recovery characteristics

(1) DQE, the detection efficiency can reach 74%, while the DQE of ordinary screen X-ray photos is 30%.

(2) DR imaging speed is fast, the acquisition time is less than 10ms, and the imaging time is only 3 seconds, so the radiologist immediately observes the image on the screen. It can be sent to the post-processing workstation in a few seconds to read the film and send a diagnosis report. It takes about 5- 10 minutes from examination to diagnosis report for conventional chest DR photos.

(3) DR has high spatial resolution and low noise rate. Amorphous silicon is directly converted into electrical signals after X-ray irradiation, which can avoid the reduction of image sharpness caused by other imaging methods. For example, high-definition images can be obtained after ordinary screen combination photos and CR rays are irradiated with phosphorus. High performance MTF curve can be obtained.

(4) Digital images can be post-processed. Image post-processing is the biggest feature of digital images. Only after retaining the original data can the image be processed by software functions according to the needs of diagnosis, thus improving the diagnosis rate.

Processing contents include window technology, parameter measurement, feature extraction, image recognition, two-dimensional or three-dimensional reconstruction, gray scale transformation, data compression, etc., which are all important manifestations of high-tech medical imaging applications.

References:

Baidu encyclopedia -X-ray detection

References:

Baidu encyclopedia -Dr