Midplane dose determination and verification of calculated doses in 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.

Keywords: Total body irradiation, in-vivo dosimetry, thermoluminescence dosimetry