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Evaluation of an electron Monte Carlo dose calculation algorithm for electron beam.

Ye Angela Hu¹, Haijun Song², Zhe Chen³

¹Department of Radiation Oncology, University of Colorado Health Science Center, Aurora, CO.

Journal of Applied Clinical Medical Physics

|August 22, 2008

Summary

The Eclipse electron Monte Carlo (eMC) algorithm shows acceptable agreement with clinical measurements for radiation therapy, but smaller grid sizes are recommended for accuracy, especially with small fields.

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Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition

Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition

Published on: March 11, 2021

Area of Science:

Medical Physics
Radiation Oncology
Computational Dosimetry

Background:

The Eclipse treatment planning system's electron Monte Carlo (eMC) algorithm relies on linac head simulation and beam modeling.
Minimal measured beam data is used, necessitating validation with clinical measurements.

Purpose of the Study:

To systematically evaluate the accuracy of the Eclipse eMC dose calculation algorithm.
To compare calculated and measured dose distributions for electron beams using data from Varian 21EX linacs.

Main Methods:

Comparison of measured and eMC calculated dose distributions (R90, R80, R50, R10, bremsstrahlung dose, surface dose, field width, penumbra).
Evaluation of cutout factors for small field sizes (down to 3x3 cm).
Assessment of the impact of calculation grid size on dose accuracy.

Main Results:

R-values agreed within 3 mm, bremsstrahlung dose within 1% (20 MeV), and surface dose within 2%.
Field width and penumbra agreed within 3 mm.
A grid size of 2.5 mm with 3% accuracy yielded output agreement within 3% for fields ≥ 5x5 cm, but up to 8% disagreement for 3x3 cm cutouts.

Conclusions:

The eMC algorithm in Eclipse demonstrates acceptable agreement with measurements for most clinical scenarios.
A calculation grid size of 2.5 mm or smaller is recommended for reliable dose calculations.
Accuracy for small cutout fields requires careful consideration.