Abstract
The success of the implementations of a radiotherapy treatment planning system is determined by the ability of the dose calculation algorithms to reproduce the algorithm input data, and in most cases the agreement was found within ±2%. Varian linear accelerator DMX, TPS Eclipse (version 10.33) is used and absolute dosimetry and relative dosimetry system (PTW, Freiburg, Germany) and 2D array were also used. The Calculation of Analytical Anisotropic Algorithm (AAA) is more accurate than the Pencil beam Algorithm (PBC) in heterogeneity medium in comparison with practical measurement. The extent of the effort required to carry out a validation study of the complexity of that described here precludes its use as a routine component of TPS commissioning. Our realistic recommendation is that commissioning includes tests aimed at confirming that raw beam data have been entered correctly and that the operation of the system is understood. Finally, the study tell us that the observed deviations between TPS calculated using Eclipse version 10.33 and measured dose in the present of heterogeneous medium are well within the tolerance levels and the study also show that the use of Eclipse (version 10.33) TPS, AAA algorithm records significant improvement than the previous TPS versions especially in the present of low density inhomogeneity.
Highlights
Many calculation algorithms are used in treatment planning systems (TPSs) for external beam radiotherapy
The algorithm input data required to implement a treatment unit in the TPS which generated by PBC and Analytical Anisotropic Algorithm (AAA) are the beam reference data needed for the subsequent evaluation of the dose calculation algorithm
To evaluate the global performances of the dose calculation algorithm, comparisons of measured and calculated doses were performed for clinical cases .This s tudy was performed to assess the Eclipse TPS before its using in 3D CRT .The clinical commissioning tests described in this study are based on the use of CIRS Thorax phantom (Fig. 1)
Summary
Many calculation algorithms are used in treatment planning systems (TPSs) for external beam radiotherapy. Planning step has important role in treating cancer patients using radiotherapy to ensure that the target regio n is treated, while patient organs are not too severely injured in the process These simulations must be beforehand done to estimate the radiation dose distribution in the patient. In the software for radiotherapy treatment planning there is a need to have several different representations of threedimensional regions, for example as a set of parallel two-dimensional contours, as a point-cloud, as a binary threedimensional image, as a surface, and as a three dimensional Euclidian distance map These different representations are used as input to dose calculation algorithms, visualization, for transforming regions between different image modalities, and for persistent storage. The total dose is calculated by superposition of pencil beam dose kernels at each point around the incident b eam
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