What is the inspection of digital photography?

Digital photography is a radiological examination.

DR referred to in digital photography is a radioactive examination, which is widely used in hospitals at present and has gradually replaced CR and traditional X-ray photography.

DR examination is a digital X-ray photography technique, and it is a radiological examination method with different development through different tissues, organs and organ densities. A doctor of digital photography can check his eyes.

Digital photography DR) refers to a new digital X-ray photography technology directly controlled by computer, that is, X-ray information penetrating human body is converted into digital signals by using amorphous silicon flat panel detector, and images are reconstructed by computer and a series of image post-processing.

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After radiopharmaceuticals are introduced into the body, images of organs or lesions are obtained by using imaging instruments based on the absorption differences of radiopharmaceuticals inside and outside organs or between normal tissues and lesions. Commonly used imaging instruments include gamma camera and emission computed tomography (ECT), which can be divided into positron SPECT and single photon SPECT.

According to the imaging mode, it can be divided into static imaging and dynamic imaging. Because the quantity and speed of radiopharmaceuticals absorbed by the lesion site are closely related to its blood flow, functional state, metabolic rate or receptor density, the obtained image can not only show its position and shape, but also reflect the above situation, so it is a functional imaging.

In the early stage of most diseases, the above-mentioned functional state has changed before the morphological structure changes, so radionuclide imaging can often find and diagnose many diseases earlier than XCT, MRI and ultrasound, which mainly show the morphological structure.

However, its spatial resolution is not as good as other medical imaging methods mentioned above, and its clarity is poor. Therefore, various imaging methods should be properly selected or combined as required.

Analysis results

Based on the principle of competitive binding, the specific immune reaction or receptor ligand reaction is combined with sensitive radioactive measurement technology to form an ultra-micro analysis method.

This method has been used to determine the contents of more than 300 kinds of hormones, antigens, drugs and receptors related to some tumors and viruses in blood, urine, various body fluids and tissues, and the lowest detection value can generally reach nanogram (ng) to picogram (pg) level (10-9 ~10-0/2g), and some of them.

Therefore, this method has become an important means for the diagnosis and research of endocrine diseases, the monitoring of drug blood concentration, the diagnosis and classification of some tumors and infectious diseases, and the study of receptors, and has been widely used.