Parameterization of electron beam output factor

Akino, Yuichi; Zhu, Timothy C.; Das, Indra J.

doi:10.1016/j.ejmp.2015.02.006

Cited by 4 publications

(1 citation statement)

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“…Previous studies have been performed in this respect to get Output Factors using the Monte Carlo method [4]. Prediction of Output Factors have also been obtained using a parametric form [5] and pencil beam algorithm [6]. Several studies have been done on measuring dosimetric properties of small electron fields.…”

Section: Introductionmentioning

confidence: 99%

Empirical formulation for small circular electron fields

Khan¹,

Kumar²,

Kumar³

et al. 2020

Biomed. Phys. Eng. Express

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An empirical model for small circular electron fields was developed. This can be of great help in the treatment planning process for small circular electron fields. A complete dosimetric analysis of the circular fields defined by electron cutouts diameters (2 cm–9 cm) was done for nominal electron energies ranging between 6 MeV and 20 MeV using a 3D water phantom and a pin-point ion chamber. Properties studied included depth dose, in-air inverse-square fall-off, and beam profiles. The Varian Clianc 2100 C accelerator was modelled, benchmarked and Monte Carlo simulations were performed using the EGSnrc/BEAMnrc code for the small circular cutouts. A simple exponential model was found to accurately predict the very important therapeutic depth (90% of Dmax) for the small circular field size within an accuracy of better than 2 mm in most cases. The model has only two parameters (d90 and ‘b’). Also, the penumbra widths (90% of the off-axis profiles) of these small circular electron fields were studied and least square fitted to a simple quadratic model. Full dosimetric profiles of these small circular electron fields were further studied using the benchmarked Monte Carlo simulations. This study presents a simple model to predict the very important therapeutic depth (90% of Dmax) and a recipe to develop such an electron treatment model for any linear accelerator system. Such predictions can be extremely valuable and time saving prior to treatment planning involving not only small circular shaped electron fields but also irregularly shaped electron fields.

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Section: Introductionmentioning

confidence: 99%