Determining and verifying the coordinate transformation between an X-ray system and a surgery navigation system

US8886286B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Rainer Graumann · Annaberg-Buchholz, DE
• Gerhard Kleinszig · Forchheim, DE
• Martin Ringholz · Erlangen, DE

Key dates

• Filing date: Apr 20, 2011
• Grant date: Nov 11, 2014
• Expiry date: Apr 20, 2031

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61B2090/3995
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

The device enables the detection of positions of the navigation marking elements on a reference star by way of at least two projection images taken by an X-ray system at different pivoting angles of a C-arm. The positions of the navigation marking elements on the reference star are also calculated by a navigation system tracking camera. The transformation from the coordinate system of the navigation system into the coordinate system of the X-ray system is calculated from the position of the reference star detected by the X-ray system and the position of the reference star detected by the tracking camera. The navigation marking elements are located outside of the volume which is reconstructed by way of the imaging process in order to prepare tomographic images. The positions of the navigation marking elements are determined from two-dimensional projections. All the navigation marking elements need only be detected by at least two projection images.