alexa Treatment Couch Modeling in the Treatment Planning System Eclipse
ISSN: 1948-5956

Journal of Cancer Science & Therapy
Open Access

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Research Article

Treatment Couch Modeling in the Treatment Planning System Eclipse

Daniela Wagner* and Hilke Vorwerk

Department of Radiotherapy and Radiooncology, University Hospital Goettingen, Robert-Koch-Str. 40, 37075 Goettingen, Germany

*Corresponding Author:
Dr. Daniela Wagner
Department of Radiotherapy and Radiooncology
University Hospital Goettingen, Robert-Koch-Str. 40, 37075 Goettingen, Germany
Tel: +49-551-398866
Fax: +49-551-396192
E-mail: [email protected]

Received date: September 28, 2010; Accepted date: October 18, 2010; Published date: October 18, 2010

Citation: Wagner D, Vorwerk H (2011) Treatment Couch Modeling in the Treatment Planning System Eclipse. J Cancer Sci Ther 3: 007-012. doi:10.4172/1948-5956.1000049

Copyright: © 2011 Wagner D, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution and reproduction in any medium, provided the original author and source are credited.

 

Abstract

Purpose: Previously in treatment planning systems (TPS) the treatment couch was expected to be made out of air-equivalent material due to the used material (Carbon). Some studies have already shown that the treatment couch cannot be neglected during treatment planning. Nowadays the manufacturer of TPS implemented the feasibility to insert treatment couch structures. This study aimed to find the correct modeling of the treatment couch parameters in the TPS Eclipse. Method: The Varian Exact Treatment Couch consists of a carbon board (length 2.5 cm) and two moveable rails (length 8.5 cm) underneath. The treatment couch can be modeled in TPS by changing the Hounsfi eld units (HU) for each part of the treatment couch. For low and high photon energies the attenuation of the treatment couch was measured at a Clinac 2300 C/D and in the TPS the attenuation of the treatment couch model was determined for different sets of HU values. Measured and calculated attenuations were compared to each other. Results: Minimum aberration between the calculated and measured attenuation of treatment couch were found for the HU values of -750 HU for the carbon plate, -995 HU for the filling of the carbon plate and 225 HU for the rails. Additionally it was found that the attenuation is dependent on the gantry angle. Like expected the highest attenuation was found in the region of the rails underneath the treatment couch. Conclusion: For Varian Exact Treatment Couch the HU values should be adjusted to -750 HU for the carbon plate, -995 HU for the filling of the carbon plate and 225 HU for the rails. The same HU set can be used for low and high photon energies. With the correct set of HU values the treatment couch is modeled correctly in the TPS Eclipse.

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