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Proceedings Paper

Quantitative proton radiography of an animal patient
Author(s): Uwe Schneider; Matthias Dellert; Eros Pedroni; Peter Pemler; Juergen Besserer; Martin Moosburger; Prisca Theiler; Barbara Kaser-Hotz
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Paper Abstract

Images (with a spatial resolution of 1 mm x 1mm) were produced both, with range and range dilution information of the protons passing through a dog. The radiographies were taken prior to a proton radiotherapy treatment of a nasal tumor, while the dog patient was under anesthetics. The first image was created by calculating the mean range of the protons detected in each pixel. This image was compared to calculations of the treatment planning system based on a CT-scan of the dog. Errors in the calculated range could be detected. The second image was produced by calculating the width of the range spectrum in each pixel. This value is a measure of the dilution of the range due to tissue inhomogeneities. The dilution image can be used to indicate critical situations during proton therapy, to determine the safety margin around the tumor volume, or to optimise treatment. In a preliminary analysis of the radiography data we found range uncertainty and range dilution effects in the order of up to 10 mm.

Paper Details

Date Published: 5 June 2003
PDF: 8 pages
Proc. SPIE 5030, Medical Imaging 2003: Physics of Medical Imaging, (5 June 2003); doi: 10.1117/12.479946
Show Author Affiliations
Uwe Schneider, City Hospital Triemli (Switzerland)
Matthias Dellert, Ludwig-Maximilians-Univ. Muenchen (Germany)
Eros Pedroni, Paul Scherrer Institute (Switzerland)
Peter Pemler, City Hospital Triemli (Switzerland)
Juergen Besserer, City Hospital Triemli (Switzerland)
Martin Moosburger, Ludwig-Maximilians-Univ. Muenchen (Germany)
Prisca Theiler, Univ. Zurich (Switzerland)
Barbara Kaser-Hotz, Univ. Zurich (Switzerland)

Published in SPIE Proceedings Vol. 5030:
Medical Imaging 2003: Physics of Medical Imaging
Martin J. Yaffe; Larry E. Antonuk, Editor(s)

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