X-RAY CT DEVICE AND IMAGE RECONSTRUCTION METHOD

摘要

In order to provide an X-ray CT device and an image reconstruction method which are capable of improving spatial resolution of the entire effective field of view without loss of rotational speed in an FFS method which improves spatial resolution by moving an X-ray focal position to multiple positions to acquire projection data, the X-ray focal position in an X-ray tube device (101) is shifted to acquire focal point shift projection data (FFS projection data), a virtual view generation unit (126) up-samples the FFS projection data in a viewing direction (generation of a virtual view), and in a reconstruction calculation process of an image, a reconstruction calculation unit (127) reconstructs the image using actual data of the FFS projection data in a center region (604) which is closer to the center of the image than a prescribed boundary and using the up-sampled projection data in a peripheral region (603) which is outside the boundary.