Evaluation of a photon dose calculation algorithm applied to fast-neutron therapy treatment planning using a neutron pencil-beam kernel
(English)Manuscript (preprint) (Other academic)
Treatment planning in fast-neutron therapy is commonly performed using conventional treatment planning systems designed for photon beam therapy. In this work Monte Carlo derived neutron pencil-beam kernels in water were parameterised using an algorithm developed for photon beams and implemented in the TMS photon dose treatment planning system. A rectangular fast-neutron fluence spectrum with energies 0-40 Me V was used. Central axis depth doses and lateral dose distributions were calculated by the dose planning system and compared with corresponding dose distributions using direct Monte Carlo calculations in homogeneous water phantom and heterogeneous phantoms. Good agreement was found in both lateral and depth dose distributions in a homogeneous water phantom. However, considerable deviations were obtained between absorbed doses calculated by the dose planning system and the Monte Carlo calculated absorbed doses in heterogeneous media. The multipurpose Monte Carlo code FLUKA was used both for the calculation of the pencil-beam kernel and in the direct calculations of absorbed dose in the phantom.
Medical and Health Sciences
IdentifiersURN: urn:nbn:se:liu:diva-95604OAI: oai:DiVA.org:liu-95604DiVA: diva2:636495