Modelling of a proton spot scanning system using MCNP6

Ardenfors, OscarStockholms universitet,Fysikum,Stockholm University, Stockholm, Sweden (författare)

Funding agencies:This work was partially supported by the Swedish Radiation Safety Authority under the contract SSM2016-2425. The authors declare no conflict of interest.
The aim of this work was to model the characteristics of a clinical proton spot scanning beam using Monte Carlo simulations with the code MCNP6. The proton beam was defined using parameters obtained from beam commissioning at the Skandion Clinic, Uppsala, Sweden. Simulations were evaluated against measurements for proton energies between 60 and 226 MeV with regard to range in water, lateral spot sizes in air and absorbed dose depth profiles in water. The model was also used to evaluate the experimental impact of lateral signal losses in an ionization chamber through simulations using different detector radii. Simulated and measured distal ranges agreed within 0.1 mm for R90 and R80 , and within 0.2 mm for R50 . The average absolute difference of all spot sizes was 0.1 mm. The average agreement of absorbed dose integrals and Bragg-peak heights was 0.9%. Lateral signal losses increased with incident proton energy with a maximum signal loss of 7% for 226 MeV protons. The good agreement between simulations and measurements supports the assumptions and parameters employed in the presented Monte Carlo model. The characteristics of the proton spot scanning beam were accurately reproduced and the model will prove useful in future studies on secondary neutrons.

Dasu, AlexandruLinköpings universitet,Avdelningen för radiologiska vetenskaper,Medicinska fakulteten,The Skandion Clinic, Uppsala, Sweden(Swepub:liu)aleda92 (författare)
Kopeć, MariuszUniversity of Science and Technology, Krakow, Poland (författare)
Gudowska, IrenaStockholms universitet,Fysikum,Stockholm University, Stockholm, Sweden(Swepub:su)igudo (författare)
Stockholms universitetFysikum (creator_code:org_t)

Ingår i:International Nuclear Science and Technology Conference: Institute of Physics (IOP)860, s. 012025-
Ingår i:Journal of Physics: Conference Series: Institute of Physics (IOP)860, s. 012025-1742-65881742-6596

Av författaren/redakt...: Ardenfors, Oscar; Dasu, Alexandru; Kopeć, Mariusz; Gudowska, Irena

Om ämnet

MEDICIN OCH HÄLSOVETENSKAP: MEDICIN OCH HÄLS ...; och Klinisk medicin; och Cancer och onkol ...

Av lärosätet: Stockholms universitet; Uppsala universitet; Linköpings universitet

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