ESTRO 2024 - Abstract Book

S3271

Physics - Detectors, dose measurement and phantoms

ESTRO 2024

Results:

The dose perturbation ratios at each depth were determined and plotted for each experiment ( Figure 2e-g ). For experiments 1 and 2, doses behind the components were seen to decrease sharply between 3-10 mm and 20-22 mm respectively before increasing with increasing depth. Both experiments saw the vertical screw having the largest dose perturbation. The maximum dose perturbation for the vertical screws were 0.738±0.013 for experiment 1, and 0.868±0.006 for experiment 2. The maximum dose perturbation for horizontal screws were largely similarly at 0.901±0.011 and 0.914±0.009. No noticeable dose perturbation was observed for the titanium mesh for both experiments. In experiment 3, dose perturbation was observed to gradually increase with increasing depth, with the maximum dose perturbation found to be 0.931±0.007 for clip SN-2378. Figure 2. (a) Metal mesh/plate, horizontal and vertical screws used in experiment 1 & 2, and (b) 4 aneurysm clips used in experiment 3 and (c-d) an example of their respective raw dose maps. Yellow and blue squares and lines represent locations where mean dose were taken within and outside respectively. (e-g) Dose perturbation ratios at different depths for each experiment.