Abstract
Aim: The purpose of this study was to make a comparison between measured and calculated physical wedge dose distributions using the superposition algorithm. Settings and Design: The accurate determination of absorbed dose is important radiotherapy because of the relatively steep sigmoidal dose response curves for both tumor control and normal-tissue damage. Materials and Methods: High-energy photons (6 and 10 MV) from Artiste Treatment System Linear Accelerator Machine, available at Alexandria Ayadi Al-Mostakbal Oncology Center, were used. Results and Discussion: The results showed that the difference between measured and calculated wedged isodose curves depends on field size, beam energy, and the angle of the used wedge. Conclusion: The results showed that the presence of a wedge alters the primary and scattered components generated by a linear accelerator and causes beam hardening in 6 and 10 MV. The beam hardening increased as the wedge angle increased.
Highlights
The accurate determination of absorbed dose is crucial to the success of radiotherapy because of the relativelyHow to cite this paper: Dawod, T., Abdelrazek, E.M., Elnaggar, M. and Omar, R. (2014) Dose Validation of Physical Wedged Asymmetric Fields in Artiste Linear Accelerator
A physical wedge is an angled piece of lead or steel that is placed through the beam path to produce a gradient in radiation intensity
The highest difference of our results is higher than Venselaar and Welleweerd and lower than Caprile et al [26] which riches to 28.5% for pencil-beam convolution (PBC) for field size 20 × 20
Summary
The accurate determination of absorbed dose is crucial to the success of radiotherapy because of the relativelyHow to cite this paper: Dawod, T., Abdelrazek, E.M., Elnaggar, M. and Omar, R. (2014) Dose Validation of Physical Wedged Asymmetric Fields in Artiste Linear Accelerator. There are several papers reporting the results of wedge beam profile measurements from physical, virtual and dynamic filters, using different dosimeters such as diode, ionization chamber, chemical dosimeter, film and numerical methods that use Monte Carlo calculation codes [1]. Three different methods are routinely used to produce a wedged dose distribution for a high-energy photon beam. The use of mechanical wedge filters is a well-established method for dose inhomogeneity compensation in photon therapy [5], wedge filters, which raise two problems in the radiotherapy practice: progressive attenuation of beam across the field (the thinner side of the wedge attenuates the beam less than the thicker side) and spinning of isodoses curves plate [6] [7]
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