Three-Dimensional Respiratory Deformation Processing for CT Vessel Images Using Angiographic Images

摘要

In interventional radiology, fluoroscopy is used to determine the position of the catheter inserted into a vessel. However, since vessels cannot be identified in fluoroscopic images, it is difficult to forward a catheter to a target region only with fluoroscopy. Thus, angiography and preoperative computed tomography (CT) images are used for the clinical purpose. CT images are useful for understanding the three-dimensional (3D) structure, but guidance of catheter is still difficult since the relationship between CT images and the fluoroscopic image is unclear. In this study, we developed a method for 3D representation of deformed vessels in CT images using an angiographic image acquired preop-eratively under natural respiration and preoperative CT images. We implemented the registration algorithm and applied it to patient data. As a result, we confirmed that the vessels in CT images were correctly deformed, and a position error was two pixels in the median value.