X-RAY CT DEVICE

摘要

The present invention prevents aliasing of the X-ray detector from lowering the spatial resolution and enhances the precision of measurement in an X-ray CT device. An X-ray CT device for capturing an X-ray transmission image from a plurality of angular directions with respect to an object and generating a tomographic image of the object on the basis of the transmission images, wherein a plurality of detection pixels of an X-ray detector (2) are added together and a signal is retrieved, and also the adding positions of the plurality of detection pixels are changed in synchronization with a plurality of image scanning timings, thereby allowing a computer (CPU), which is a signal processing unit, to enhance the spatial resolution without lowering the S/N of the CT image thus measured. This has the effect of making it possible to measure finer structures, such as blood vessels, and enhance the diagnostic capability, without having to increase the subject's exposure in, for example, medical CT.

主权项

1. An X-ray CT device that generates a CT image of an object, comprising:
an X-ray generation unit; an X-ray detection unit that detects an X-ray image irradiated from the X-ray generation unit; a rotation mechanics unit that rotates the X-ray generation unit and the X-ray detection unit around the axis of rotation; and a signal read-out unit that reads out a signal detected by the X-ray detection unit at a predetermined image scanning timing and a signal processing unit that processes a signal that has been output from the signal read-out unit to generate the CT image of the object, wherein the signal read-out unit adds and outputs signals detected by Nx detection pixels that are adjacent in an X direction and/or Nz detection pixels that are adjacent in a z direction (here, Nx and Nz are integers of 1 or more and either one of them is 2 or more) in the plurality of detection pixels configured in a matrix on an X-ray input plane of the X-ray detection unit, and performs changing of an addition position of the detection pixel where the addition is performed in synchronization with the image scanning timing.