Medical image imaging technology

Since the development of medical imaging, there are other imaging technologies besides X-ray, and many imaging technology applications have been developed. In addition, in the application of biomedical information, in order to exchange and consult the generated digital image files and digital image files, the medical digital image transmission protocol technology is developed. Commonly used medical imaging techniques include:

Angiography: or arteriography or angiography, it is to irradiate the inside of human body with X-rays and observe the distribution of blood vessels, including arteries, veins or atria.

Cardiac angiography: the contrast agent is quickly injected into the heart chamber or blood vessel through the cardiac catheter, so that the heart and blood vessel chamber are developed under X-ray irradiation. At the same time, the development of heart and vascular lumen can be photographed by rapid photography, television photography or tape recording. From the development results, we can see the blood flow sequence containing contrast agent and the filling situation of cardiac blood vessels, so as to understand the physiological and anatomical changes of the heart and blood vessels. This is a valuable method to diagnose cardiovascular diseases.

Computed tomography (CT), or computed tomography, can be divided into X-ray CT(X-CT), ultrasonic CT(UCT) and gamma-ray CT(γ-CT) according to the different rays used.

Mammography: It uses low-dose (about 0.7 millisieverts) X-rays to examine human (mainly female) breasts. It can detect various breast tumors, cysts and other lesions, which is helpful for early detection of breast cancer.

Positron emission tomography (PET) is a nuclear medical imaging technology, which provides three-dimensional and functional images for the whole body. At present, it is the only technique for imaging function, metabolism and receptor through anatomy and morphology, which has the characteristics of non-trauma and is one of the best means for clinical diagnosis and treatment of tumors.

Nmri (Nuclear Magnetic Resonance Imaging): The emitted electromagnetic waves are detected by an external gradient magnetic field, from which the internal structure of human body can be obtained.

Medical ultrasound examination: a non-invasive examination method, which uses the physical characteristics of ultrasound and electronic engineering technology to quickly analyze, process and display ultrasound by computer, so as to judge the physical characteristics, morphological structure and functional state of human soft tissues and visualize muscles and internal organs, including their size, structure and pathological changes.