Chinese name of ct

Computed tomography. CT (Computed Tomography) is computed tomography, which uses accurately collimated X-rays, gamma rays, ultrasonic waves, etc. And perform cross-sectional scanning around a specific part of the human body together with a high-sensitivity 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). . ? Chinese name. Computed tomography. mbth。 Computed tomography. Other names. CT machine.

CT uses X-ray beam to scan a certain thickness layer of human body. X-rays passing through this layer are received by the detector, converted into visible light, converted into electrical signals by photoelectric conversion, converted into digital by analog-digital converter, and input into a computer for processing. The process of image formation is like dividing the selected layer into several cuboids with the same volume, which are called voxels. The X-ray attenuation coefficient or absorption coefficient of each voxel is obtained by calculating the information obtained by scanning, and then arranged into a matrix, that is, a digital matrix, which can be stored in a disk or an optical disk.

Through the D/A converter, each number in the digital matrix is converted into small squares with different gray levels from black to white, that is, pixels, which are arranged in the matrix to form a CT image. Therefore, CT images are reconstructed images. The X-ray absorption coefficient of each voxel can be calculated by different mathematical methods.