The whole process of CT imaging?

Need 200 words? X-ray computed tomography, the full name is its principle.

Alas, for 50 points, look at the following:

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 through photoelectric conversion, and then converted into digital by analog-digital converter, and input into the computer for processing. Image formation is like dividing the selected layer into several cuboids with the same volume, which are called voxels, as shown in figure 1-2- 1. By calculating the scanned information, the X linear attenuation coefficient or absorption coefficient of each voxel is obtained, 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.