Research On Techniques Of Segmentation And Registration Of DSA-CT Living Liver Images

Virtual liver surgery Planning System can provide a platform for inter-operation, Simulate surgical procedures, thereby contribute to the development of individualized reasonable surgical program. It can reduce the risk of injury of important structures of liver; can reduce the incidence of Postoperative liver function.As an integral part of Virtual liver surgery Planning System, the exploration of this article is on of the segmentation and registration of CT liver images and DSA liver vessel image. First, segmentation of liver parenchyma in CT images, and then division of the blood vessel in the liver parenchyma, and segmentation of vessels in DSA image. Then three-dimensional reconstruction of CT vessels. Select view point to have perspective projection, registration the projection results with DSA image. Select the highest degree of matching results, calculate the edge of the liver parenchyma in accordance with the results of CT angiography projection. After registration , add the edge of liver parenchyma on DSA image. Which can facilitate Doctor observe the edge of liver parenchyma on DSA image, provide guidance to virtual liver surgery Planning System.The main contributions of this thesis are mainly lied in the following aspects:1. Aimed at the respective characteristics of CT and DSA images, corresponding algorithms were designed. The segmentation of CT liver parenchyma, CT vessels and DSA vessels, were realized.2. Three-dimensional reconstruction of CT vessel images and projection algorithm of any angle were realized.3. from The principle of imaging by CT, CT data of the blood vessels are the overall vascular. DSA can get partial vessels because of carried out for the infusion of a point. Then, before registration, Should first determine which part of that three-dimensional CT vessel for registration, for partial cutting, that is, partial cutting for three-dimensional CT vessels. 4. An improved registration algorithms were designed, the registration algorithm with DSA image and projection images of three-dimensional CT vessels were realized.