Conical bundle CT reestablishment method based on helix saddle line

Abstract

A cone-beam CT reconstruction method based on a helical saddle line in the field of biomedical imaging technology, the steps are: firstly let an X-ray source scan along the path of the helical saddle line, adjust parameters in real time during the scanning process, and then scan the The obtained projection data is reconstructed using the exact back-projection filter reconstruction algorithm, the exact filter back-projection algorithm or the three-dimensional cone beam approximate reconstruction algorithm, and displayed. The present invention can realize not only the scanning mode of the helical line, but also the scanning mode of the saddle line, and the scanning mode of the spiral saddle line between the two, and is especially suitable for the tracking and detection of intravascular bolus injection, and the false detection rate is low. reduced by more than 20 percent.

Description

technical field [0001] The present invention relates to a method in the technical field of biomedical imaging, in particular to a cone beam CT reconstruction method based on a helical saddle line. Background technique [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. The accurate reconstruction algorithm of cone-beam...

AI Technical Summary

Problems solved by technology

The advantage of this method is that the data acquisition speed is fast, and images with different resolutions can be obtained in different regions of the measured object by adjusting the pitch of the helix; the disadvantage of this method is that the movement direction of the X-ray source along the Z axis is unidirectional, In one scan, only one reconstruction image can be obtained for each area of ​​the measured object, and there is nothing that can be done for some areas that need to be observed repeatedly

Taking the tracking of intravascular bolus injection as an example, due to the uncertainty of blood flow, backflow or blockage may occur, so repeated observations are required for the same area. If the X-ray source and detector use a helical line with variable pitch to scan can not meet the requirements

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