X-CT scanning system

Abstract

The invention relates to an X-CT scanning system, which comprises main controlling processing computer, base, object table, mechanical controller, X-ray generator and data collector, wherein the detector array is vertically the central line of X-ray source of generator and the object table; one side of array is align or over the extending line of said central line; the over length is smaller than the radius of table. The invention only uses the x-ray data that covers half of object section to build whole object picture, to save size of detector, with high quality.

Description

technical field [0001] The invention relates to an X-CT scanning system, in particular to a detector biased X-CT scanning system. Background technique [0002] Computed tomography (CT) is widely used in medical diagnosis and industrial non-destructive testing. Fan beam or cone beam X-CT system is the most widely used in many CT systems. Because the mechanical structure required by the CT circular orbit scanning method is simple and easy to implement, and the corresponding reconstruction algorithm is mature and reliable, therefore, most of the existing X-CT scanning systems adopt the circular orbit scanning method, and at the same time use the linear array (corresponding to the fan beam X-CT) or area array detector (corresponding to cone beam X-CT), the detector is placed symmetrically with respect to the line connecting the X-ray source to the rotation center of the object turntable, or in the case of detector micro-movement technology, allowing Slight deviation. Especiall...

AI Technical Summary

Problems solved by technology

However, the traditional convolution back-projection algorithm requires that the projection data must be non-truncated along the direction of the detector, which requires that the detector must have sufficient length in the lateral direction to cover the complete cross-section of the object.

Therefore, when the object to be measured is large in size, the X-ray beam needs to have a sufficient opening angle and the detector has a large size to completely cover the entire object; this is difficult to achieve in some applications

[0004] To detect objects with large cross-sections, a feasible method is to use the second-generation scanning method: rotation + translation, covering the entire object through multiple scans, and then using the rearrangement method to obtain complete projection data; but this scanning method is time-consuming and laborious , which greatly increases the hardware complexity and overhead of the system, and at the same time the amount of data doubles, which increases the amount of calculation and reduces the reconstruction speed

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