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Proceedings Paper

Time-of-flight sensor for patient positioning
Author(s): Christian Schaller; Andre Adelt; Jochen Penne; Joachim Hornegger
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Paper Abstract

In this paper we present a system that uses Time-of-Flight (ToF) technology to correct the position of a patient in respect to a previously acquired reference surface. A ToF sensor enables the acquisition of a 3-D surface model containing more than 25,000 points using a single sensor in real time. One advantage of this technology is that the high lateral resolution makes it possible to accurately compute translation and rotation of the patient in respect to a reference surface. We are using an Iterative Closest Point (ICP) algorithm to determine the 6 degrees of freedom (DOF) vector. Current results show that for rigid phantoms it is possible to obtain an accuracy of 2.88 mm and 0.28° respectively. Tests with human persons validate the robustness and stability of the proposed system. We achieve a mean registration error of 3.38 mm for human test persons. Potential applications for this system can be found within radiotherapy or multimodal image acquisition with different devices.

Paper Details

Date Published: 13 March 2009
PDF: 8 pages
Proc. SPIE 7261, Medical Imaging 2009: Visualization, Image-Guided Procedures, and Modeling, 726110 (13 March 2009); doi: 10.1117/12.812498
Show Author Affiliations
Christian Schaller, Friedrich-Alexander-Univ. Erlangen-Nuremberg (Germany)
International Max Planck Research School for Optics and Imaging (Germany)
Andre Adelt, Friedrich-Alexander-Univ. Erlangen-Nuremberg (Germany)
Jochen Penne, Friedrich-Alexander-Univ. Erlangen-Nuremberg (Germany)
Joachim Hornegger, Friedrich-Alexander-Univ. Erlangen-Nuremberg (Germany)
Erlangen Graduate School in Advanced Optical Technologies (Germany)

Published in SPIE Proceedings Vol. 7261:
Medical Imaging 2009: Visualization, Image-Guided Procedures, and Modeling
Michael I. Miga; Kenneth H. Wong, Editor(s)

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