Dose evaluation in lung-equivalent media in high-energy photon external radiotherapy

Radiation Protection Dosimetry
Maria Amor DuchM Ribas

Abstract

In high-energy photon external radiotherapy treatment planning systems (TPSs) are used to calculate the dose to the target volume and the dose distribution around it. Commonly used TPSs include algorithms based on measurements in water and often fail in the estimate of dose in the presence of heterogeneities. In this study TL detectors were used to study the reliability of the Cadplan (Varian) TPS in the presence of low-density heterogeneities such as the lung for 6 and 18 MV photon beams at different field sizes. TL measurements were compared with TPS calculations and Monte Carlo simulations performed with the PENELOPE MC code. In a phantom with lung heterogeneity, TL measurements and MC simulations agreed, with an average deviation inside the lung of 2%. In contrast, TPS results overestimated the dose inside the lung, with a maximum deviation of 39% for the 18 MV photon beam and a field size of 2 x 2 cm(2).

References

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Citations

Mar 20, 2009·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Lasse Rye AarupStine S Korreman
Dec 22, 2006·Physics in Medicine and Biology·Vanessa PanettieriMontserrat Ribas
Oct 24, 2007·Physics in Medicine and Biology·José M Fernández-VareaLorenzo Brualla
May 22, 2008·Medical Physics·A ViamonteJ E Cygler
Feb 7, 2020·Physics in Medicine and Biology·Neslihan SarigulBulent Aydogan
Feb 18, 2010·Journal of Applied Clinical Medical Physics·L A R da RosaA Facure
May 21, 2021·Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)·V García BalcazaM A Duch

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