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Updated: Jul 9, 2026
Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition
Published on: March 11, 2021
Evaluation of calculation algorithms implemented in different commercial planning systems on an anthropomorphic
Martin Polednik1, Yasser Abo Madyan, Frank Schneider
1Department of Radiation Oncology, Mannheim University Hospital, University of Heidelberg, Mannheim Medical Center, Germany. Martin.Polednik@radonk.ma.uni-heidelberg.de
Purpose:
To evaluate the accuracy of dose calculation algorithms of different planning systems for postoperative tangential radiotherapy in breast cancer.
Material And Methods:
On a CT dataset of an anthropomorphic phantom, a structure set of the left lung, clinical target volume (CTV), planning target volume, heart, and external contour were delineated. The dataset was processed by six radiation oncology centers participating in this multicenter dosimetry project. Conventional plans with two tangential wedged fields were generated in MasterPlan, Pinnacle, Eclipse, TMS, and PrecisePLAN. Plan calculations were done using the beam data of local linacs. The dose distributions were verified under local conditions with Gafchromic-EBT films.
Results:
In all planning systems, deviations between calculation and measurement were around +/-3% in the CTV in the measured plane. Only small areas with deviations of +/-5% were detected. Pencil-beam (PB) calculations overestimated the dose inside the lung by up to 23%. Collapsed cone (CC) underestimated the lung dose by up to 6%.
Conclusion:
CC calculates the dose distribution more accurately than PB. Inside regions with electron disequilibrium, however, the dose is slightly underestimated.
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