2Ege Üniversitesi Tıp Fakültesi, Radyasyon Onkolojisi Anabilim Dalı, İzmir OBJECTIVES
To compare calculated and measured doses for different regions of anthropomorphic phantom and patients using ion chamber and thermoluminescence dosimetry (TLD) for total body irradiation.
METHODS
Measurements were done for lateral fields with 6 MV, gantry
82º, 40x40 cm2 field and 400 cm source-axis distance (SAD).
Entrance-exit and midline doses were measured on anthropomorphic
phantom by TLD and entrance-exit doses were measured
by TLD and ion chamber on patients.
RESULTS
For anthropomorphic phantom measurements differences between
calculated and measured entrance-exit doses of head,
neck, shoulder, lung and thick pelvis were 0.8%, 2.7%, 26.4%,
4.4% and 4.9% and for midline doses were 1.6%, 1.6%, 6.3%,
-1.4% and 7.4% respectively. For patients; TLD differences
were within -4.13% ile 6.7%, -3.3% ile 3.9%, 5.1% ile 16.6%,
-7.8% ile 2.4%, and 3.6% ile 7.1% respectively. For thick pelvis
measurements with ion chamber differences were within
%0.1-1.9.
CONCLUSION
Total body irradiation is being applied in limit values in our
clinic.