Medical image definition
Medical imaging is a science that studies the interaction between human body and certain media (such as X-ray, electromagnetic field, ultrasound, etc.) to express the structure and density of human internal tissues and organs in the form of images, so that diagnostic doctors can judge according to the information provided by the images, so as to evaluate the health status of human body
Medical imaging equipment is a variety of instruments that use various media as information carriers to reproduce the internal structure of the human body into images. Its image information corresponds to the actual structure of the human body in space and time distribution. The development of medical imaging equipment has experienced a process from radiation diagnosis to image diagnosis, and then to comprehensive analysis and diagnosis of image information
Classification of medical imaging equipment
Medical imaging equipment can be divided into large medical imaging equipment and other medical imaging equipment. Large imaging diagnostic equipment mainly includes X-ray imaging (Cr, Dr, DSA, etc.), computed tomography (CT), magnetic resonance imaging (MRI) and nuclear medicine (PET-CT, PET-MR, etc.), and other imaging equipment mainly includes ultrasonic imaging equipment and medical endoscope
X-ray imaging: imaging is performed according to the principle that different tissues of the human body have different X-ray absorption. X-ray images can intuitively display the relevant morphology of human bones and organs. X-ray images show overlapping images of human internal organs
Computed tomography (CT): the same as the principle of X-ray imaging, the biggest difference between CT and X-ray imaging lies in the use of accurately collimated X-ray beam, y-ray, ultrasound, etc. and highly sensitive detectors to scan one section after another around a certain part of the human body, and finally form a gray-scale image through the computer system
