Accuracy of central axis dose calculations for photon external radiotherapy beams in Finland: the quality of local beam data and the use of averaged data

Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology
Mika KapanenMikko Tenhunen

Abstract

The accuracy of central axis dose calculation was evaluated for 48 photon beams from 28 linear accelerators at nine centres in Finland. In addition, inter-accelerator consistency of beam data was evaluated for Varian Clinac 600 CDs and 2100 CDs, and averaged data sets were generated for output factors (OFs) and percentage depth doses (PDDs). The averaged data sets obtained were used to identify potential dosimetry reasons for local errors. Agreement between measured and calculated doses was determined at isocentre at 10 cm depth in water for nine different sized open square and rectangular fields. Averaged OFs were determined for nominal energies of 4, 6, 10, 15 and 18 MV both at d(max) and at a 10-cm depth. In order to develop a function for the OF data, OFs for square fields were parameterised through empirical model fitting. The feasibility of a simple equivalent square collimator formula was also evaluated for the presentation of OFs for rectangular fields. Averaged PDDs were determined at a 10-cm depth. The difference between measured and calculated doses exceeded +/-3%, +/-2% and +/-1% for 3, 6 and 35 of the investigated 48 beams, respectively. The differences were due to errors observed in both OFs and depth dose data. W...Continue Reading

References

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Citations

May 14, 2009·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Mika KapanenMikko Tenhunen
Dec 25, 2015·Journal of Applied Clinical Medical Physics·Christopher F Njeh

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