Digital radiography (DR) is also a newly developed digital imaging technology that has similar uses to computed tomography (CR), but with different basic principles and structures. DR is developed based on digital fluorescence photography (DF), which uses image enhancement tubes as information carriers to receive X-ray information transmitted through the human body. After being captured by video cameras, it is converted into digital signals and then digitized. Unlike CR, which requires specialized equipment instead of matching with other devices, CR can collect information on any X-ray imaging device using an imaging board, except for the difference in information carrier. DR, like CR, can perform various post-processing of images, including image transmission and storage. DR is a common basic imaging examination method that uses X-rays to perform overlapping imaging of the human body. It is mainly used for chest examination of patients, such as determining whether they have pneumonia, tuberculosis, lung tumors, pleural effusion, pneumothorax, bronchiectasis, etc; DR can also be used for abdominal examination to determine whether the patient has gastrointestinal obstruction, gastrointestinal perforation, or intestinal distension; It can also determine whether there are stones in the urinary system and determine the position of the contraceptive ring in female patients; In addition, DR examination is very clear in displaying fractures, so many trauma patients need to undergo DR examination to determine whether they have suffered fractures or other conditions.
The precautions for DR examination are as follows: 1. Before the examination, first register and make an appointment with the imaging department. DR examination is divided into general examination and special examination. Special examination requires appointment time, and medical staff guide patients to make necessary preparations before the examination; 2. Early pregnant women should avoid DR testing. If pregnant for more than six months, DR testing must be conducted and signed by the pregnant woman and her family before testing. Lead clothing should be used to protect other parts during the examination; 3. Family members should effectively cooperate with doctors to complete examinations for uncooperative young children, elderly and frail patients, and critically ill patients; 4. Before inspection, metal jewelry and other foreign objects must be removed from the inspection area. The three-dimensional imaging of limbs and joints, as well as the inspection area, should be exposed as much as possible; 5. During the examination, medical personnel should position themselves properly and patients should strictly cooperate and not move to improve image quality and facilitate diagnosis of the condition; During chest and abdominal examinations, hold your breath. Generally, holding your breath while breathing calmly and evenly is beneficial for improving image quality. If you cannot hold your breath, please explain to your physician; Both DR and CT examination rooms have walkie talkies. If patients experience discomfort or abnormalities during the examination, please inform the doctor immediately for prompt treatment.
Clinical significance: 1. Due to its own characteristics, computerized X-ray imaging systems are mainly used to match traditional X-ray machines and achieve the digitization of plain film information. The digital X-ray imaging system can be used for X-ray plain film display, as well as for performing contrast examinations of the gastrointestinal system, other systems, and blood vessels. However, due to the limitations of the digital X-ray imaging system's inability to be matched with multiple X-ray machines and the relatively high cost of a single machine, computer X-ray imaging and digital X-ray imaging systems will be complementary imaging methods to replace conventional X-ray imaging for a considerable period of time. A common advantage of computer X-ray photography and digital X-ray photography systems is that they have much higher X-ray sensitivity and dynamic range than conventional X-ray photography equipment, which can significantly reduce the X-ray dose during examination. This is of certain significance for X-ray sensitive populations such as pregnant women, children, and the implementation of X-ray screening applications. Therefore, it is necessary to undergo DR examination during physical examination. Generally speaking, DR examination during physical examination is mainly used to diagnose whether a person's limbs have fractures, whether there is gas or fluid accumulation in the chest cavity, and whether there is gas accumulation in the abdominal cavity.
DR examination features: 1. The detection efficiency of DQE can reach 74%, while the DQE of ordinary screen film combined with X-ray is only 30%. The imaging speed of DR is very fast, with an examination time of less than 10 milliseconds and an imaging time of only 3 seconds. If radiological diagnosis is needed, the image can be immediately observed on the screen. It can be transmitted to the backend workstation for processing in a few seconds, and you can start watching the film and sending the diagnostic report. It takes about five to ten minutes for routine chest DR photography from examination to obtaining the diagnostic report. DR has relatively high spatial resolution and low noise rate. When amorphous silicon is irradiated with X-rays, it can be directly converted into electrical signals, which can avoid other imaging methods. For example, by combining photos with ordinary screens and irradiating phosphorus with light such as CR, the sharpness of the scattered image will gradually decrease. Therefore, high-definition images can be obtained, and high-performance MIT curves can be obtained. The digital images detected by DR can be processed in the background, and the biggest feature of image background processing is digital images. By retaining the original data in the background, it is possible to process images in a targeted manner according to diagnostic needs through software functions, which can improve the diagnostic accuracy. DR has a relatively low radiation dose, and the chest frontal image of DR has one tenth the X-ray dose of CR image. That is to say, the X-ray dose received by combining X-ray chest images on one screen is equal to the total X-ray dose of 53.3 DR images. Therefore, the dose of X-ray irradiation received by DR images will be much lower than the radiation standards set by CEC. Moreover, DR can effectively reduce the adverse effects of X-ray exposure on the human body, especially for children and adults who are sensitive to X-rays, DR imaging is the best choice for X-ray examination. DR has technology that can be directly converted, making network work simpler and more efficient, laying the foundation for the full digitization and filmless development of medical imaging. 7. DR can effectively handle the storage, management, and transmission issues of images. By using CD burning to archive image data, it can help the person undergoing inspection provide printing services for photos at any time, avoiding photo loss and duplication. Moreover, the obtained DR photos are high-definition and recognized by major hospitals.