Cone beam CT instant scanning device and reconstruction method

Abstract

The invention relates to a cone beam CT instant scanning device and a reconstruction method. The reconstruction method includes steps of S1, placing an objective table in a scanning device, placing ascanned object on the objective table, and starting a scanning device; S2, starting all high-speed flat panel detectors, and scanning the object by an X-ray focal point in the scanning device, and immediately closing the X-ray focal point after collecting the projection data of the object; S3, traversing all X-ray focal points according to an appointed order and acquiring projection data of the object under the scanning device at the current moment; S4, repeating steps S2 and S3, acquiring the projection data of the scanned object under the scanning device at the next moment, and closing the cone beam CT instant scanning device; S5, rebuilding the object at every moment by a con beam CT reconstruction algorithm based on LO regularization, and acquiring a three-dimensional voxel and a faultage image of the scanned object at every moment and displaying them. The device can scan the object very quickly and is free from any mechanical movement during the scanning process; the time resolution is high.

Description

technical field [0001] The invention belongs to the technical field of biomedical imaging and non-destructive testing, and relates to a cone-beam CT instantaneous scanning device and a reconstruction method. Background technique [0002] CT imaging technology has been successfully applied in the fields of biomedical imaging and non-destructive testing and has achieved great development. In order to meet the detection requirements of objects of different structures and sizes, different scanning methods and reconstruction algorithms have been developed. Most scanning methods scan static objects. During the scanning process, objects only rotate or translate, and the size, shape, and internal structure of objects do not change over time; scanning methods and reconstruction algorithms for static objects can obtain high spatial resolution. Reconstruct images at a high rate and meet actual needs. [0003] In the field of industrial non-destructive testing, there are many situatio...

AI Technical Summary

Problems solved by technology

In 1983, R.A.Robb and E.A.Hoffman. proposed a fast-scanning device to scan organs such as the heart and lungs in the Proceedings of the Institute of Electrical and Electronics Engineers in 1983; the device installed multiple ray sources equidistantly in a semicircle On the surface, multiple detection devices installed on the opposite side of the ray source are used to record the projection data corresponding to each ray source, and the projection data of the scanned object at multiple angles can be obtained in a very short time. The time resolution is high, because all The ray sources are installed on the same circumference, and the scanning device has a complex structure and high cost

S.J.Schambach et al. proposed a multi-focus ray source and digital flat-panel detector for CT angiography of anesthetized mice in the Journal of the American Heart Association in 2009. During the acquisition of projection data, the mice within 40 seconds Continue to rotate 180 degrees at a constant speed to obtain 1200 pieces of projection data, and use the FBP (Filtered Backprojection) algorithm for image reconstruction. This method takes a long time to scan and has low time resolution.

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