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Proceedings Paper

Accuracy of needle implantation in brachytherapy using a medical AR system: a phantom study
Author(s): Stefan Wesarg; Evelyn A. Firle; Bernd Schwald; Helmut Seibert; Pawel Zogal; Sandra Roeddiger
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Paper Abstract

Brachytherapy is the treatment method of choice for patients with a tumor relapse after a radiation therapy with external beams or tumors in regions with sensitive surrounding organs-at-risk, e. g. prostate tumors. The standard needle implantation procedure in brachytherapy uses pre-operatively acquired image data displayed as slices on a monitor beneath the operation table. Since this information allows only a rough orientation for the surgeon, the position of the needles has to be verified repeatedly during the intervention. Within the project Medarpa a transparent display being the core component of a medical Augmented Reality (AR) system has been developed. There, pre-operatively acquired image data is displayed together with the position of the tracked instrument allowing a navigated implantation of the brachytherapy needles. The surgeon is enabled to see the anatomical information as well as the virtual instrument in front of the operation area. Thus, the Medarpa system serves as "window into the patient". This paper deals with the results of first clinical trials of the system. Phantoms have been used for evaluating the achieved accuracy of the needle implantation. This has been done by comparing the output of the system (instrument positions relative to the phantom) with the real positions of the needles measured by means of a verification CT scan.

Paper Details

Date Published: 5 May 2004
PDF: 12 pages
Proc. SPIE 5367, Medical Imaging 2004: Visualization, Image-Guided Procedures, and Display, (5 May 2004); doi: 10.1117/12.535415
Show Author Affiliations
Stefan Wesarg, Fraunhofer-Institut fuer Graphische Datenverabeitung (Germany)
Evelyn A. Firle, Fraunhofer-Institut fuer Graphische Datenverabeitung (Germany)
Bernd Schwald, Zentrum fuer Graphische Datenverarbeitung e.V. (Germany)
Helmut Seibert, Zentrum fuer Graphische Datenverarbeitung e.V. (Germany)
Pawel Zogal, MedCom GmbH (Germany)
Sandra Roeddiger, Klinikum Offenbach (Germany)

Published in SPIE Proceedings Vol. 5367:
Medical Imaging 2004: Visualization, Image-Guided Procedures, and Display
Robert L. Galloway, Editor(s)

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