2Acıbadem Kozyatağı Hastanesi, Radyasyon Onkolojisi Kliniği
3İstanbul Üniversitesi Onkoloji Enstitüsü, Tıbbi Radyofizik Bilim Dalı OBJECTIVES
In this study, it was purposed to design an aluminium material using compensator in order to obtain homogeneous dose distribution in irradiated volume on an irregular treatment field.
METHODS
For preparation of the compensator for large body curve, the
anterior supra field of 25x26 cm and the lateral field of the
face of 13x12 cm were selected. For the selected fields, the
compensators were prepared using a man-shaped special
phantom. The selected lateral face and anterior supra field
without using the compensator and on Co-60 apparatus, dose
distribution was obtained by film dosimetry method from
man- shaped sagittal two-segmented special phantom.
Findings were controlled using another measuring system
thermoluminescent dosimeter. The experimental studies
made without using the compensator were repeated with the
compensator. The dose distributions obtained with and without
compensator were compared and any positive contribution
to dose distribution was investigated.
RESULTS
The data obtained from this study using compensator on the
treatment field with excess surface irregularity, on lateral
face, medial line and vertical axis, showed 5% more homogeneous
dose distribution, and for supra field, parallel axis to
radiation field to isodose distribution was 11.1% more homogeneous.
CONCLUSION
Consequently, in the case of curved or irregular treatment surfaces,
a more homogeneous dose distribution can be produced
using tissue compensators prepared for each patient separately.
This will increase treatment quality in clinical use.