Progress in Medical Physics (한국의학물리학회지:의학물리)

Korean Society of Medical Physics (한국의학물리학회)
권호 표지
DOI QR코드

DOI QR Code

Comparison between Old and New Versions of Electron Monte Carlo (eMC) Dose Calculation

  • Seongmoon Jung (Department of Radiation Oncology, Seoul National University Hospital) ;
  • Jaeman Son (Department of Radiation Oncology, Seoul National University Hospital) ;
  • Hyeongmin Jin (Department of Radiation Oncology, Seoul National University Hospital) ;
  • Seonghee Kang (Department of Radiation Oncology, Seoul National University Hospital) ;
  • Jong Min Park (Department of Radiation Oncology, Seoul National University Hospital) ;
  • Jung-in Kim (Department of Radiation Oncology, Seoul National University Hospital) ;
  • Chang Heon Choi (Department of Radiation Oncology, Seoul National University Hospital)
  • Received : 2022.11.21
  • Accepted : 2023.03.24
  • Published : 2023.06.30
Download PDF
⟨ Previous Next ⟩

Abstract

This study compared the dose calculated using the electron Monte Carlo (eMC) dose calculation algorithm employing the old version (eMC V13.7) of the Varian Eclipse treatment-planning system (TPS) and its newer version (eMC V16.1). The eMC V16.1 was configured using the same beam data as the eMC V13.7. Beam data measured using the VitalBeam linear accelerator were implemented. A box-shaped water phantom (30×30×30 cm3) was generated in the TPS. Consequently, the TPS with eMC V13.7 and eMC V16.1 calculated the dose to the water phantom delivered by electron beams of various energies with a field size of 10×10 cm2. The calculations were repeated while changing the dose-smoothing levels and normalization method. Subsequently, the percentage depth dose and lateral profile of the dose distributions acquired by eMC V13.7 and eMC V16.1 were analyzed. In addition, the dose-volume histogram (DVH) differences between the two versions for the heterogeneous phantom with bone and lung inserted were compared. The doses calculated using eMC V16.1 were similar to those calculated using eMC V13.7 for the homogenous phantoms. However, a DVH difference was observed in the heterogeneous phantom, particularly in the bone material. The dose distribution calculated using eMC V16.1 was comparable to that of eMC V13.7 in the case of homogenous phantoms. The version changes resulted in a different DVH for the heterogeneous phantoms. However, further investigations to assess the DVH differences in patients and experimental validations for eMC V16.1, particularly for heterogeneous geometry, are required.

Keywords

Acknowledgement

This work was supported by the Seoul National University Hospital (No. 0420220290).

References

  1. Sung J, Jin H, Kim J, Park JM, Kim JI, Choi CH, et al. Improvement of calculation accuracy in the electron Monte Carlo algorithm with optional air profile measurements. Prog Med Phys. 2020;31:163-171. https://doi.org/10.14316/pmp.2020.31.4.163
  2. Chamberland E, Beaulieu L, Lachance B. Evaluation of an electron Monte Carlo dose calculation algorithm for treatment planning. J Appl Clin Med Phys. 2015;16:4636.
  3. Aubry JF, Bouchard H, Bessieres I, Lacroix F. Validation of an electron Monte Carlo dose calculation algorithm in the presence of heterogeneities using EGSnrc and radio-chromic film measurements. J Appl Clin Med Phys. 2011; 12:3392.
  4. Eclipse photon and electron algorithms reference guide. Palo Alto: Varian Medical Systems, Inc. 2015; P1008611-003-C.
  5. Eclipse photon and electron algorithms reference guide. Palo Alto: Varian Medical Systems, Inc. 2020; P1044595-001-A.