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Proceedings Paper

Automatic patient alignment for prostate radiation applying 3D ultrasound
Author(s): Marcus Kaar; Alfred Kratochwil; Michael Figl; Rainer Hoffmann; Amon Bhatia; Amar Bhatia; Wolfgang Birkfellner; Johann Hummel
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Paper Abstract

Latest developments in radiation therapy such as IGRT (image guided radiation therapy) and IMRT (intensity modulated radiation therapy) promise to spare organs at risk by applying better dose distribution on the tumor. For any effective application of these methods the exact positioning of the patient and the localization of the exposured organ is crucially. With respect to the filling of rectum and bladder the prostate can move several millimeters up to centimeters. That implies the need of daily determination and correction of the position of the prostate before irradiation. We build a system which uses 3D US at both sites, the CT room and the intervention room and applied a 3D/3D USUS registration for fully automatic repositioning. In a first step an appropriate preprocessing of the US images is necessary. We implemented an importance image filter process to improve the following registration success. For the 3D3D registration five different object functions were implemented. To find the object function which fits best for the particular patient three 3D US images were taken at the CT site and an US registration error was calculated. The most successful object function was then applied at the treatment site.The US registration error was found to be 3.48 ± 2.32 mm (eight patients) with resect to the Mutual Information metric by Mattes. For complete repositioning the distance error amounted to be 5.0 ± 3.1 mm (four patients).

Paper Details

Date Published: 17 February 2012
PDF: 8 pages
Proc. SPIE 8316, Medical Imaging 2012: Image-Guided Procedures, Robotic Interventions, and Modeling, 83161Q (17 February 2012);
Show Author Affiliations
Marcus Kaar, Medical Univ. of Vienna (Austria)
Alfred Kratochwil, Medical Univ. of Vienna (Austria)
Michael Figl, Medical Univ. of Vienna (Austria)
Rainer Hoffmann, Medical Univ. of Vienna (Austria)
Amon Bhatia, Medical Univ. of Vienna (Austria)
Amar Bhatia, Medical Univ. of Vienna (Austria)
Wolfgang Birkfellner, Medical Univ. of Vienna (Austria)
Johann Hummel, Medical Univ. of Vienna (Austria)
Wilhelminenspital (Austria)

Published in SPIE Proceedings Vol. 8316:
Medical Imaging 2012: Image-Guided Procedures, Robotic Interventions, and Modeling
David R. Holmes III; Kenneth H. Wong, Editor(s)

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