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

Abstract

A multi-source saddle line trajectory cone beam CT approximate reconstruction method in the field of biomedical imaging technology. The present invention adopts the structure of N X-ray sources and N detectors, scans with N saddle line trajectories, uses the projection data collected on N detectors to combine into complete projection data, and uses the filter back projection approximation algorithm to directly The three-dimensional volume data is reconstructed. The invention increases the imaging speed by dozens of times at the cost of reducing the image precision by a small amount, and is especially suitable for real-time continuous observation of the measured object.

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...

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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.

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