CT image reconstruction method and system

Abstract

The invention discloses a CT image reconstruction method and system. The method comprises the following steps: reconstructing initial cone beam projection data obtained by circular scanning through animage reconstruction technology to obtain an initial image; performing nonlinear processing on the initial image to obtain a corrected image; performing numerical simulation on the corrected image togenerate corrected cone beam projection data; calculating the corrected cone beam projection data and the initial cone beam projection data to obtain differential projection data; processing the difference projection data through an image reconstruction technology to obtain a difference image; and fusing the difference image and the corrected image to obtain a final image. Only projection simulation and nonlinear transformation are added on the basis of an existing reconstruction technology, simple and small calculated amount is achieved in the artifact image reconstruction process, comparedwith an iterative algorithm, the method is simpler, meanwhile, a good image reconstruction effect can be achieved, clinical practical application is met, and universality is achieved.

Description

technical field [0001] The present invention relates to the technical field of medical imaging, in particular to a CT image reconstruction method and system thereof. Background technique [0002] The CT medical imaging system has made great progress since its invention in the 1970s, and the scanning speed has changed from a few minutes at the beginning to 0.2 seconds now. The number of detector rows has also changed from single row and double row at the beginning to the current 64 rows, 128 rows, and even 256 rows. The change is not only the upgrade of the system hardware, but also the system's image reconstruction technology has brought about revolutionary changes. Since the initial CT system has only one row of detectors, the X-ray beam is a fan beam, and the reconstruction techniques used are also two-dimensional fan beam reconstruction techniques. Because only one layer can be scanned at a time, the entire scan takes a long time. Later, multi-slice CT was introduced to...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a CT image reconstruction method and its system in view of the above-mentioned defects of the prior art, aiming at solving the problems caused by the iterative algorithm in the prior art in reducing cone beam artifacts to the image quality. The amount of calculation in the process of influence is very large, and it is difficult to meet the problems of clinical practical application

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