What is DR

DR(Digital Radiography) is a direct digital X-ray photography system, which consists of an electronic cassette and a scanner.

Controller, system controller, image monitor, etc. , which directly converts X-ray photons into

Digital image is a generalized direct digital X-ray photography. In a narrow sense, direct digital photography is

DDR(DirectDigit Radiography) usually refers to the image direct conversion technology using flat panel detector.

Digital radiography is a real direct digital X-ray photography system.

The similarity between DR and CR is that X-ray image information is converted into digital image information, but its exposure latitude is opposite.

Compared with ordinary intensifying screen-film system, it has some advantages: CR and DR have dynamic range because of digital technology.

Wide, have a wide exposure latitude, thus allowing technical errors in photography, even under certain exposure conditions.

The part that is difficult to grasp can also get a good image; CR and DR can perform various images according to clinical needs.

Post-processing, such as various image filtering, window width and window level adjustment, zoom roaming, image mosaic, distance and area.

, density measurement and other rich functions, providing detailed observation, comparison and quantitative analysis in image diagnosis.

Technical support. The performance comparison between them is as follows:

1. Imaging principle: DR is a direct X-ray conversion technology, which uses selenium as X-ray detector and imaging ring.

Fewer festivals; CR is an indirect X-ray conversion technology, which uses an image plate as an X-ray detector, and the imaging link is the opposite.

See Dr for more details.

2. Image resolution: DR system has no image blur caused by optical scattering, and the clarity is mainly determined by pixels.

Size determination; Due to the structure of CR system, when irradiated by X-ray, phosphorus particles in the image plate will make

X-rays are scattered, resulting in blurred latent images; In the process of interpreting the latent image, the excitation light of the laser scanner passes through.

Scattering occurs in the depth of the image plate, and stimulated fluorescence is formed along the path, which blurs and shrinks the image.

Resolution, so the shortcomings of the current CR system are mainly the poor time resolution, which can not meet the needs of dynamic organs.

And the display of structure.

3.DR is the future development direction, but the current structure of DR electronic cassette is14 in×17 in (1

In=2.54 cm) is composed of four pieces, and the joint of each piece cannot be made due to the limitation of process.

There is no seam. Once one piece is damaged, all four pieces should be replaced, which is not only expensive, but also needs to be modified.

There are some X-ray machines, but the cost of CR is relatively low, and multiple X-ray machines can be used at the same time without changing the existing equipment.

Get ready.

4.CR system is more suitable for X-ray plain film photography, and its non-dedicated model can be matched with many conventional X-ray cameras.

Use, more suitable for X-ray photography of complex parts and postures; DR system is more suitable for perspective and point photography.

However, due to the flux limitation of single machine, it is not easy to replace multi-machine simultaneous operation in large hospitals.

It is a conventional X-ray photographic equipment, but it is more suitable for multi-purpose use in small medical units and clinics. In fact,

CR and DR systems will be a pair of parallel development systems for a long time.

Characteristics of digital X-ray imaging technology

Digital X-ray machine is an advanced technology combining computer digital image processing technology with X-ray radiation technology.

X-ray machine Based on the direct film imaging of the original diagnostic X-ray machine, through A/D conversion and D/A conversion,

Perform real-time image digital processing, and then digitize the image. It broke the traditional X-ray machine.

This concept realizes the transformation from analog X-ray image to digital X-ray image that people dream of.

Features:

First, its most outstanding advantages are high resolution, clear and delicate images, and doctors can enter as needed.

In order to obtain ideal diagnosis results, various image post-processing such as digital subtraction are carried out.

Secondly, the device can display digital images in real time in the perspective state, and doctors can then analyze the patient's condition according to the patient's condition.

Digital photography, and then through a series of image post-processing, such as edge enhancement, magnification, black and white flip.

And image smoothing, from which rich and reliable clinical diagnosis information can be extracted, especially for early lesions.

It can provide good diagnostic conditions.

Thirdly, the digital image formed by digital X-ray machine is more important than the X-ray measurement required by traditional film imaging.

Less, so you can get high-definition images with lower X-ray dose and reduce the X-ray exposure of patients.

The harm of radiation.

Fourth, because it has changed the traditional film photography, it can make the hospital radiology department cancel the original version.

The image management method based on "online" and film storage warehouse can be replaced by computer file management method without film.

It can save a lot of money and space and greatly improve work efficiency. In addition, due to the appearance of digital X-ray images

Now, the history that X-ray images can't enter the hospital PACS system has been ended, and remote expert consultation and networking have been carried out for the hospital.

Online communication provides great convenience. In addition, the device can also display multiple images and compare them.

In order to help doctors distinguish and diagnose accurately. Through the image scrolling playback function, you can also recall the whole picture for the doctor.

Visual inspection process.

Clinical application of digital X-ray

The quality of digital image and the amount of image information contained can be comparable to that of traditional X-ray imaging. Image position

The management system can adjust the contrast. Therefore, the best visual effect can be achieved; The tolerance range of photographing conditions is large; patient

The amount of x-rays received is reduced. Image information can be stored and transmitted by disk or optical disk, which are all digital.

Advantages of images.

Digital image and traditional X-ray image are overlapping images of the whole area, so traditional X-ray

The parts that can be photographed can also be imaged by DR, and the observation and analysis of DR images are the same as those of traditional X-rays.

The difference is that the DR image is composed of a certain number of pixels.

Digital images are superior to traditional X-ray imaging in displaying bone structure, articular cartilage and soft tissue, and can also

Quantitative analysis of mineral salt content. Digital images can easily show mediastinal structures such as blood vessels and trachea. Right tubercle

The detection rate of sexual lesions is higher than that of traditional X-ray images, but the pulmonary interstitial and alveolar lesions are not as good as traditional X-ray images.

Images. DR is superior to traditional X-ray images in observing calcium-containing diseases such as intestinal pneumatosis, pneumoperitoneum and calculus.

Tomography using digital images is superior to X-ray tomography. Gastrointestinal double contrast radiography in displaying small areas of stomach, micro

In small lesions and intestinal mucosal folds, digital images are superior to traditional X-ray photography.

DR is a new imaging technology, which is superior to traditional X-ray imaging in many aspects, but in terms of cost performance.

Compared with traditional X-ray imaging, it is still difficult to be replaced. In clinical application, DR is not as irreplaceable as CT and MRI.

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