Under the condition that the projection data has been determined, the quality of the reconstructed image, such as spatial resolution and density resolution, depends heavily on the image reconstruction algorithm used; in addition to the running environment and software, the speed of image reconstruction is also related to the image. Reconstruction method related.
Considering the higher spatial resolution, shorter data acquisition time and higher ray utilization efficiency, the above advantages of 3D cone beam CT make it widely used in medicine and industry, and the cone beam reconstruction algorithm is also rapidly Development, these algorithms include analytical algorithms and iterative algorithms. Analytic algorithms are divided into approximation algorithms and exact algorithms. The parsing algorithms have faster reconstruction speed and occupy less memory resources.
Therefore, it becomes the mainstream algorithm in the CT system. In the analytic algorithm, the approximation algorithm is simple in mathematics and easy to implement, and when the cone angle is small, it can achieve better reconstruction effect, so it is widely used in practice. The exact reconstruction algorithm requires complete projection data and no noise. In this case, accurate reconstruction will achieve very satisfactory results.
Although the approximate reconstruction algorithm is efficient and easy to implement, when the cone angle is increased, the tomographic image away from the center layer will have obvious artifacts, and with the rapid development of detector technology, the engineering restrictions are less and less. The exact reconstruction algorithm will be widely used in the near future.
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