Dose calculation accuracy of lung planning with a commercial IMRT treatment planning system.
The dose calculation accuracy of a commercial pencil beam IMRT planning system is evaluated by comparison with Monte Carlo calculations and measurements in an anthropomorphic phantom. The target volume is in the right lung and mediastinum and thus significant tissue inhomogeneities are present. The Monte Carlo code is an adaptation of the MCNP code and the measurements were made with TLD and film. Both the Monte Carlo code and the measurements show very good agreement with the treatment planning system except in regions where the dose is high and the electron density is low. In these regions the commercial system shows doses up to 10% higher than Monte Carlo and film. The average calculated dose for the CTV is 5% higher with the commercial system as compared to Monte Carlo.
McDermott
Patrick N
PN
Department of Radiation Oncology, Karmanos Cancer Institute and Wayne State University, Detroit, Michigan 48201, USA. mcdermot@karmanos.org
He
Tongming
T
DeYoung
A
A
D000465:Algorithms; D006801:Humans; D008168:Lung / Q000473:pathology*; D008176:Lung Volume Measurements / Q000379:methods; D009010:Monte Carlo Method; D019047:Phantoms, Imaging; D011237:Predictive Value of Tests; D011879:Radiotherapy Dosage; D011880:Radiotherapy Planning, Computer-Assisted / Q000379:methods* / Q000706:statistics & numerical data; D020266:Radiotherapy, Conformal / Q000379:methods* / Q000706:statistics & numerical data; D011882:Radiotherapy, High-Energy / Q000379:methods* / Q000706:statistics & numerical data; D013819:Thermoluminescent Dosimetry / Q000379:methods / Q000706:statistics & numerical data