Abstract
The objective of this study is to evaluate the dosimetric precision of the Monte Carlo (MC) algorithm to validate the Monaco® (Elekta) treatment planning system for the two radiotherapy techniques IMRT and VMAT® on the Infinity™ Elekta linear accelerator. Several irradiation plans were created on the Monaco® treatment planning system (TPS) and calculated by the integrated MC algorithm for its validation. The same plans were applied experimentally using the Matrixx Evolution 2D array with its appropriate phantom. All measurements were performed by superimposition with those calculated on the Infinity™ linear accelerator (ELEKTA). The calculated and measured dosimetric data were overlaid to make the comparison of what is realistic and what was simulated using the MyQA (IBA) software associated with the Matrixx. Good agreement was observed between calculated and measured data using 3%, 3mm distance to agreement (DTA) and low dose threshold 5% criteria. Global gamma analysis passing rates for all tests are greater than 95%. An agreement less than 2 mm is shown for open fields and homogenous dose test. However, there was increase in the agreement criteria above 3 mm for chair and pyramid test as a result of high gradient dose regions especially at the edge of target volumes. Results obtained from this study allowed, in one hand to confirm the accuracy of our MC model dose calculation with Monaco® TPS, and in the other hand, the use of the matrix detector as a standard tool for IMRT/VMAT® patient quality control.
Highlights
Intensity modulated radiotherapy (IMRT) and volumetric modulated arc therapy (VMAT®) are a modern radiotherapy delivery technique that allows a precise conformation of the radiation dose to the target volumes with a minimal dose to the surrounding normal tissue
IMRT employ the capability of the leaves motion control and VMAT® a simultaneous variation of the gantry rotation speed, beamlets shape and dose rate during treatment delivery [2] The dose modulation is obtained via an inverse planning system that adjusts the beam intensities and multileaf collimator (MLC) control to find the best configuration for tumor irradiation and organ at risk (OAR) sparing as requested by the planner
This work aims are to present our experience with the implementation of new Monaco® treatment planning system (TPS) used for 3D conformal radiotherapy, IMRT and VMAT® techniques, in this work we focus on examining the TPS calculation algorithm accuracy under several conditions, for IMRT and VMAT® plan calculation
Summary
Intensity modulated radiotherapy (IMRT) and volumetric modulated arc therapy (VMAT®) are a modern radiotherapy delivery technique that allows a precise conformation of the radiation dose to the target volumes with a minimal dose to the surrounding normal tissue. Both techniques are based on the intensity variation of the used radiation beam, each one is divided into smaller radiation beamlets with a different intensity, the sum of the above beamlets enables the highly conformal dose distribution [1]. This work aims are to present our experience with the implementation of new Monaco® TPS used for 3D conformal radiotherapy, IMRT and VMAT® techniques, in this work we focus on examining the TPS calculation algorithm accuracy under several conditions, for IMRT and VMAT® plan calculation
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