Radiotherapy uses high-energy photons to treat deep-seated tumors. When high-energy
photons interact with a medium, they will transport their energy and create secondary
charged particles. These particles will either move further into the medium and create ion
pairs that cause the biological effect in the tissue, or exit it. Causing a buildup effect of the
dose on the surface of the medium. This makes the area, or better the skin of the patient, a
difficult area to measure.
In this study, one dosimeter (TLD) is considered a dosimeter that can be used for surface
dosimetry and will be compared to gafchromic EBT3 film and LiFo (EPR dosimetry) in
order to determine if these can also be used for the same purpose. Furthermore these results
are compared to the planned dose in order to analyze the accuracy of that dosimeter and to
analyze the dose calculation software.
The results show that both dosimeters, EBT3 film and LiFo can be used for surface
dosimetry. The results are similar to one another and those of TLDs, and are even more
consistent. The disadvantage lies in the use, EBT3 film can get easily damaged when cut to
a smaller size, LiFo need a very expensive readout system. The software, XiO, or treatment
planning system for the conventional linac (1 out of 3 used techniques) will either
overestimate the skin dose on the medial side of the breast and underestimate the skin dose
on the lateral side. While the others (BrainLAB for the Vero system and
TomoTherapy® Treatment Planning System) will overestimate the overall skin dose.
If you want to cite this thesis in your own thesis, paper, or report, use this format (APA):
VANDERSMISSEN, E. (2012). Skin dose evaluation of breast carcinona treatment.
Unpublished thesis, Xios, TIW.