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A semi-empirical method for calculating the effect of air gap space on output factors on electron beam dose
H Kharrati1, P Aletti, I A Bruinvis
1Hôpital-clinique Claude Bernard, Service de radiotherapie, Metz, France.
Background:
A simple approach to calculate the effect of air gap on output factors on electron beam dose distribution is presented.
Methods:
The method accounts for variations of pencil beam parameters using a model developed by Bruinvis et al. [4,5]. The evaluation of this method is based on measurements of the output factors at various distances between the final collimating device and the phantom surface.
Results:
Comparison of calculations and measurements of output factors for various cone sizes and 0, 2 and 4 cm air gaps show agreement to within approximately 1.5% for electron energies of 6-13.5 MeV and field sizes of 5.3-10 cm in diameter.
Conclusion:
The accuracy of this semi-empirical method can be considered clinically acceptable and reduces the amount of experimental work needed.
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