Reserch On Spatial Registration Algorithm Of The Surgery Navigation System

With the continuous improvement of material life level, people more concern about their health. At the same time they put forward higher requirements for medical treatment. Surgical navigation system is a combination of computer, image processing, spatial orientation, and other advanced technology. It makes some operations that using traditional surgical method cannot complete or difficult to finish possible. Surgical navigation system has the characteristics of high accuracy and minimally invasive. Compared to the past, doctors can use surgery navigation system to simulate the operation, which greatly improved the security of the surgery. Surgery navigation system complies with the requirements of new advanced medical technology.This thesis studies space registration. It is one of the key technology of surgical navigation system. Space registration is to unify the space coordinate system of patients with lesions and the coordinate system of virtual space. This thesis has respectively carried on the experiment for the paired point set registration and the unpaired point set registration. At first for the paired point set, the traditional quaternion algorithm and SVD decomposition method were used to carry on the registration, and for the unpaired point set using ICP algorithm. In order to improve the accuracy of registration. For paired point set, the author use ICP to improve quaternion algorithm. For unpaired point set, the author use the improved ICP algorithm based on Delaunay subdivision for secondary accurate registration.At last this paper has carried on the simulation test for the two improved algorithm. The test result shows that the time of the two kinds of improved registration algorithm in computing is longer than before, but still within the acceptable range. At the same time the registration precision has obvious enhancement. It reaches the desired results.