ESTRO 2024 - Abstract Book

S3262

Physics - Detectors, dose measurement and phantoms

ESTRO 2024

Erlangen, Germany), and treatment planning was performed in RayStation version 11B (RaySearch Laboratories AB, Stockholm, Sweden).

Results:

Measurements of PDD curves using the slabbed phantom made from CT HE Solid Water showed high equivalence with water (< 1% difference) at depths of 10 cm or more. At more shallow depths, the dose measured in the solid water phantom was up to 2% less than the reference dose measured in water, possibly owing to differences in electron transport properties of the slabbed solid water phantom compared to true water. PDD curves are shown in Figure 1.

Measurement of output factors and TPR 20/10 agreed with reference measurements in water within 0.7% and 0.5%, respectively. The TPR 20/10 , output factors, and phantom dose conversion factor is shown in Table 1 for each energy.