Projector-based augmented reality for intuitive intraoperative guidance in image-guided 3D interstitial brachytherapy

Krempien, Robert; Hoppe, Harald; Kahrs, Lüder; Daeuber, Sascha; Schorr, Oliver; Eggers, Georg; Bischof, Marc; Munter, Marc W; Debus, Juergen; Harms, Wolfgang (2008). Projector-based augmented reality for intuitive intraoperative guidance in image-guided 3D interstitial brachytherapy. International journal of radiation oncology, biology, physics, 70(3), pp. 944-52. New York, N.Y.: Elsevier 10.1016/j.ijrobp.2007.10.048

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PURPOSE: The aim of this study is to implement augmented reality in real-time image-guided interstitial brachytherapy to allow an intuitive real-time intraoperative orientation. METHODS AND MATERIALS: The developed system consists of a common video projector, two high-resolution charge coupled device cameras, and an off-the-shelf notebook. The projector was used as a scanning device by projecting coded-light patterns to register the patient and superimpose the operating field with planning data and additional information in arbitrary colors. Subsequent movements of the nonfixed patient were detected by means of stereoscopically tracking passive markers attached to the patient. RESULTS: In a first clinical study, we evaluated the whole process chain from image acquisition to data projection and determined overall accuracy with 10 patients undergoing implantation. The described method enabled the surgeon to visualize planning data on top of any preoperatively segmented and triangulated surface (skin) with direct line of sight during the operation. Furthermore, the tracking system allowed dynamic adjustment of the data to the patient's current position and therefore eliminated the need for rigid fixation. Because of soft-part displacement, we obtained an average deviation of 1.1 mm by moving the patient, whereas changing the projector's position resulted in an average deviation of 0.9 mm. Mean deviation of all needles of an implant was 1.4 mm (range, 0.3-2.7 mm). CONCLUSIONS: The developed low-cost augmented-reality system proved to be accurate and feasible in interstitial brachytherapy. The system meets clinical demands and enables intuitive real-time intraoperative orientation and monitoring of needle implantation.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Radiology, Neuroradiology and Nuclear Medicine (DRNN) > Institute of Diagnostic, Interventional and Paediatric Radiology

UniBE Contributor:

Hoppe, Hanno

ISSN:

0360-3016

ISBN:

18164834

Publisher:

Elsevier

Language:

English

Submitter:

Factscience Import

Date Deposited:

04 Oct 2013 14:58

Last Modified:

04 May 2014 23:17

Publisher DOI:

10.1016/j.ijrobp.2007.10.048

PubMed ID:

18164834

Web of Science ID:

000253224000045

URI:

https://boris.unibe.ch/id/eprint/24979 (FactScience: 54362)

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