At present, the common CT is divided into two kinds of spiral CT and ordinary CT, spiral CT belongs to the upgraded version of ordinary CT, because the spiral CT scan continuous one-way movement of the examination bed, and the patient rotation track around into a spiral tube shape, so called spiral CT, which can continuously rotate scanning, not only to improve the scanning speed, and not a certain level of data acquisition, but around the body a section of volume spiral type This allows for the acquisition of data in three dimensions, increasing the content and flexibility of information processing. Spiral CT greatly enhances tissue volume and segmentation display technology, real-time imaging technology, three-dimensional reconstruction technology, simulation endoscopy technology and cardiac function assessment, which cannot be done by ordinary CT. The main differences between spiral CT and ordinary CT are as follows: 1. Different technologies: Spiral CT equipment utilizes slip ring technology in its structure, which can understand the morphology and distribution of major lesions in organs, greatly reducing the clinical leakage rate of lesion sites; removing the wires connecting the original CT bulb tube to the phase frame, changing the power supply and data transmission of ordinary CT, making CT scanning from the original tomographic acquisition mode to continuous one-way motion, and enhance the speed of inspection and scanning; 2. Different algorithms: ordinary CT and spiral CT are also different in the algorithm of image reconstruction, ordinary CT acquires a certain tomographic surface, while spiral CT can overlap the adjacent reconstructed images or levels by continuous scanning; 3. Different clarity: spiral CT has higher clarity than ordinary CT, and spiral CT can find smaller The spiral CT can detect smaller parenchymal lesions and use its three-dimensional understanding of the characteristics and morphology of the lesion site to provide important reference value for the doctor’s diagnosis and treatment.