Abstract
The new SIEMENS MLC160 offers the application of intensity modulated techniques and stereotactic treatements within the whole 40 cm x 40 cm irradiation field. In this work we analyzed dose profiles of small off-axis fields. Larger deviations from symmetrical dose distributions have been found for fields which are generated at the maximum diagonal off-axis positions. Two different methods for an analytical description of the dose distribution generated by these fields are presented, based on the convolution of a rectangular linear- function with a kernel. A sum of two Gaussian distributions as well as a Lorentz-type function are used as such kernels. While the Gaussian method leads to known field parameterization parameters, the Lorentz type kernel offers a larger data reduction and a full analytical description of the profile.
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© 2009 Springer-Verlag Berlin Heidelberg
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Poppe, B., Riediger, J., Suft, G., Ruehmann, A., Willborn, K., Harder, D. (2009). Parameterisation of Small Photon Fields in Off-Axis Regions for the SIEMENS 160 MLC. In: Dössel, O., Schlegel, W.C. (eds) World Congress on Medical Physics and Biomedical Engineering, September 7 - 12, 2009, Munich, Germany. IFMBE Proceedings, vol 25/1. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-03474-9_71
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DOI: https://doi.org/10.1007/978-3-642-03474-9_71
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-03472-5
Online ISBN: 978-3-642-03474-9
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