Zoom static CT system and image reconstruction method

• Main Authors: WANG ZHENTIAN, XIA YINGXIAN, DENG ZHI, CHEN ZHIQIANG, GAO HEWEI, ZHANG LI, XING YUXIANG, LI LIANG
• Format: Patent
• Language: Chinese; English
• Published: 25.04.2023
• Subjects: CALCULATING; COMPUTING; COUNTING; DIAGNOSIS; HUMAN NECESSITIES; HYGIENE; IDENTIFICATION; IMAGE DATA PROCESSING OR GENERATION, IN GENERAL; MEDICAL OR VETERINARY SCIENCE; PHYSICS; SURGERY

The invention discloses a varifocal static CT system and an image reconstruction method.The system comprises a cylindrical detector array arranged in an arc shape and an X-ray source array arranged in a preset shape, the X-ray source array and the detector array are kept static during scanning, projection data are obtained at different angles through sequential beam output of different X-ray sources, and the X-ray source array and the detector array are connected with the X-ray source array. The distance from the radiation source to the detector is variable; the data acquisition system is used for controlling the detector to acquire data; the control system controls beam output of the radiation source and data acquisition of the detector; and the image processing system processes the obtained image projection data by using an image reconstruction algorithm. The image reconstruction algorithm in the embodiment of the invention adopts a weighted filtering back projection reconstruction algorithm, so that the sy