Multi-source saddle curve trace conical beam CT approximate reconstruction method

Abstract

The present invention relates to a multi-source saddle-line locus conical beam CT approximate reconstruction method, belonging to the field of bio-medical imaging technology. It is characterized by that said invention adopts a structure with N x-ray sources and N detectors, uses N saddle-line loci to make scanning, utilizes projection data collected from N detectors to make them be formed into a complete projection data, and utilizes filter back projection approximate algorithm to directly reconstruct three-dimensional body data.

Description

technical field [0001] The invention relates to a method in the technical field of biomedical imaging, in particular to a multi-source saddle line trajectory cone beam CT approximate reconstruction method. technical background [0002] The working process of cone-beam CT is as follows: the X-ray tube emits cone-beam X-rays at one point. After passing through the object to be measured, the attenuated X-rays are detected by the detector on the opposite side, and the X-rays are converted into electricity. The signal is sent to the computer's analog-to-digital converter and data collector, converted into a digital signal and stored in the computer. This is just one exposure and acquisition process. In order to obtain the projection data needed to reconstruct the measured object, the X-ray source and the corresponding detector need to scan along a certain trajectory, and complete an exposure and data acquisition process at each position. Corresponding to each trajectory, there a...

AI Technical Summary

Problems solved by technology

[0003] After searching the literature of the prior art, it was found that "ExactBPF and FBP algorithms for nonstandard" published by Hengyong Yu and Shiying Zhao et al. saddle curves” [accurate back-projection filter reconstruction algorithm and exact filter back-projection reconstruction algorithm based on non-standard saddle line], proposed an accurate back-projection filter reconstruction algorithm and exact filter back-projection reconstruction algorithm based on non-standard saddle line, the main advantages are The imaging accuracy is high, but the main disadvantage is that the imaging speed is slow. In practical applications, especially when real-time observation of the measured object is required in some occasions, the imaging speed is far from meeting the requirements.

Images