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The impact of scanning data measurements on the Acuros dose calculation algorithm configuration
A Fogliata1, E Esposito2, L Paganini2
1Radiotherapy and Radiosurgery Dept, Humanitas Clinical and Research Center - IRCCS, Via Manzoni 56, Milan-Rozzano, Italy. antonella.fogliata@humanitas.it.
Radiation Oncology (London, England)
|July 12, 2020
Summary
Accurate input data is crucial for configuring radiotherapy dose calculation algorithms. Errors in measured data, such as missing lateral scatter or incorrect effective point of measurement, significantly impact dose calculations, leading to inaccuracies.
Area of Science:
- Medical Physics
- Radiotherapy Physics
Background:
- Radiotherapy planning relies on dose calculation algorithms that require precise beam configuration.
- Optimization processes adjust physical parameters to accurately estimate dose distribution.
- This study evaluates the impact of input data quality on the Acuros-XB algorithm configuration.
Purpose of the Study:
- To investigate how the quality of measured input data affects the configuration of the Acuros-XB dose calculation algorithm.
- To analyze the impact of specific data acquisition errors on key physical parameters.
- To assess the accuracy of dose calculations based on different measurement conditions and detectors.
Main Methods:
- Configured the Acuros-XB algorithm (v15.6) for Varian TrueBeam 6 MV beams (6X and 6FFF) using various datasets.
- Datasets included correct measurements, missing lateral scatter (MLS) conditions, incorrect effective point of measurement (EPoM), and data from different detectors (Semiflex-3D, PinPoint-3D, DiodeP, microDiamond).
- Analyzed and compared optimized physical parameters (spectrum, mean radial energy, electron contamination) and calculated doses against reference measurements.
Main Results:
- Missing lateral scatter conditions and incorrect EPoM significantly altered physical parameters (mean radial energy and electron contamination, respectively).
- Dose calculation accuracy decreased, with mean differences exceeding 2% in certain conditions.
- The PinPoint-3D chamber showed lower accuracy for 6FFF beams; vendor-provided representative beam data (RBD) correlated well with configuration input but not independent reference data.
Conclusions:
- Clinical implementation must avoid MLS conditions and incorrect EPoM settings to prevent erroneous dose calculations.
- Detector selection is critical for accurate beam configuration.
- When using representative beam data, thorough verification under clinical conditions is essential.
