Patent Document ID: 20050004454
Application ID: 10850499
Patent Status: 0

Claim One:
1. A method for automatic marker-free matching of 2D fluoroscopic C-arm images with preoperative images using an intraoperatively acquired 3D record, comprising the steps of: during a medical interventional procedure involving a region of a patient, intraoperatively obtaining a 3D image of the region using a C-arm x-ray system having a C-arm and having a tool plate attached to the C-arm x-ray system; undertaking an image-based matching of an existing preoperative 3D image of the region, obtained prior to said medical interventional procedure, relative to the intraoperative 3D image, and thereby generating a matching matrix; matching the tool plate relative to a navigation system; obtaining a 2D fluoroscopic image using said C-arm x-ray system with said C-arm at any arbitrary position; determining a projection matrix for matching said 2D fluoroscopic image to said 3D image; and matching said 2D fluoroscopic image with said preoperative 3D image using said matching matrix and said projection matrix.