Organ cavity wall expanding method

Abstract

The invention provides an organ cavity wall expanding method, comprising following steps: obtaining the mask and a centre line of an organ; initializing light direction of the points on the centre line, judging whether the mask has adhesion, if the mask has the adhesion, removing the adhesion; dividing the connected domain in the mask into a plurality of lamellas; solving the main directions namely a first direction, a second direction and a third direction of the lamellas in a three-dimensional coordinate system; solving the initial normal vector and the initial tangent vector of the points on the centre line; assigning the projection result of the initial normal vector in the plane in which the first direction and the second direction are located to the normal vector in the light direction, assigning the third direction or the reverse direction of the third direction to the tangent vector in the light direction; sampling the cavity wall according to the center line and the light direction obtained in the steps, mapping the sampling result to a two-dimensional plane to generate a cavity expanded two-dimensional view. The expanding effect of the cavity wall is improved through the settings.

Description

technical field [0001] The present invention relates to the processing of tomography (Computed Tomography, CT for short) images in the medical field, and in particular to a method for expanding cavity walls of tubular organs such as bronchi, blood vessels, and colon based on light projection. Background technique [0002] The colon is an important luminal organ of the human body. Since its birth in 1994, Computed Tomography Colonography (CTC) has become a commonly used medical imaging technology for detecting colon diseases through continuous development. Computed tomography colonography (CTC) has a similar effect to colonoscopy and can image the entire colon with less invasiveness. In the post-processing of colon CT images, the expansion of the intestinal wall is to convert the 3D view of the colon lumen into a 2D plane view, so as to facilitate the observation and comparison of the internal tissues of the colon, find and display colonic lesion tissues, and facilitate subse...

AI Technical Summary

Problems solved by technology

Partial projection technology can only save the expanded result as a video for users to browse, and cannot generate a whole 2D view

The intestinal wall expansion algorithm based on ray projection, when the bending angle of the colon is very large, it is prone to errors in the expansion diagram caused by the inaccurate initial direction of the ray, and the problem that part of the content of the expansion diagram is repeated due to the intersection of rays

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