The development of position recognition system using a machine vision system in Cyberknife treatment

本研究的目的是开发一种新的位置识别系统，该系统由三个CCD摄像机和用于检测患者位置的软件组成，能够在射波刀治疗中不需要X射线照射的情况下，对患者的运动进行真实的实时检测。该系统能够识别鼻子和睑裂的特定形状，提取这些结构的边缘线，并利用特征匹配检测目标图像和配准图像的位置差异。用头部模型进行的实验表明，该系统的精度与射波刀的位置识别系统相当。

The purpose of this study is to develop a new position recognition system, which can detect the motion of the patient in real time without exposure of X ray in the Cyberknife treatment.This system composed of three CCD cameras and the software for the detection of the patient position. This system could recognize the specific shapes of the nose and palpebral fissures, extract the edge lines of these structures, and detect the differences of the position of target and registered images using the feature matching. The experiment using a head phantom suggested that the accuracy of this system was similar to that of position recognition system of Cyberknife.