Computed tomography (CT) refers to computerized tomography, which uses accurately collimated X-rays, γ-rays and ultrasonic waves. Scan one slice after another around a certain part of the human body with a highly sensitive detector. It has the characteristics of fast scanning time and clear image, and can be used for the examination of many diseases. According to the different rays used, it can be divided into X-ray CT(X-CT) and γ-ray CT(γ-CT).
The working procedure of CT is: according to the different absorption and transmittance of X-rays by different tissues of human body, the human body is measured by high-sensitivity instruments, and then the measured data are input into the electronic computer. After processing the data, the electronic computer can take a cross-sectional or three-dimensional image of the examined part of the human body and find tiny lesions in any part of the body.
CT equipment mainly has the following three parts:
1. The scanning part consists of X-ray tube, detector and scanning frame.
2. The computer system stores and calculates the information data collected by scanning.
3. Image display and storage system, which displays the reconstructed image processed by the computer on the TV screen or shoots the image with multiple cameras or laser cameras.