A method and electronic medium for removing stitching artifacts in stepped axis scan CT reconstruction

Abstract

The invention discloses a method and electronic medium for removing splicing artifacts in step-axis scan CT reconstruction, which are applied in the field of image processing technology; the method includes performing CT scanning to obtain projection data: using a cone beam reconstruction algorithm to Perform image reconstruction on the data; perform nonlinear filtering on all reconstructed images, and output the filtered image; obtain the common P layer images in and around the junction area between the kth scan and the k+1th scan, and calculate each image The distance weight and tissue structure weight are used to perform image correction on the P layer image based on the distance weight and tissue structure weight, and the splicing artifacts are removed until the image correction is completed for all data of N CT scans, and the final image with the splicing artifacts removed is obtained. The present invention performs image correction on the junction area image of the step axis scan, removes the splicing artifacts in the junction area, has high calculation efficiency, improves image quality, does not require additional hardware assistance, and can meet clinical needs.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a method and an electronic medium for removing stitching artifacts in stepping axis-scan CT reconstruction. 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 lo...

AI Technical Summary

Problems solved by technology

The main reason for this is that the reconstruction error is proportional to the square of the cone angle (proportional to the number of detector rows), and as the number of detector rows increases, it will bring a large error

In addition to the cone angle, other factors such as beam hardening, Z-axis sampling, partial volume effects, etc. can also cause image inhomogeneity and artifacts

The inhomogeneity of these image quality can easily produce artifacts near the junction area of ​​the step scan, resulting in the image not meeting the requirements of clinical diagnosis

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