ESTRO 2024 - Abstract Book

S3377

Physics - Detectors, dose measurement and phantoms

ESTRO 2024

Results:

The pretreatment verification results for 7 plans are shown in Figure 1. Acceptable results were obtained using each method (GPR > 90%). The highest result for the gamma evaluation method was achieved with 1600SRS detector for PTV and the lowest with EBT3 for OARs. The mean GPR value for OCTAVIUS detector verification is 99.4%, for EBT-XD 98.3%, and for EBT3 95.6%. The maximum and minimum results were 100%, 97.5% for SRS 1600, 99.7%, 94.2% for EBT-XD, and 99.5%, 91.3% for EBT3, respectively.

Fig. 1. Gamma Passing Rates for planes representing: PTVs and OARs, obtained using PTW 1600SRS, EBT3, and EBT XD dosimetric films. The black line indicates the acceptance level.

Conclusion:

After proper characterization and calibration, Gafchromic detectors are a suitable tool for the CyberKnife SRS and SRT verification method. As a result of the performed PSQA of OARs and PTVs in acoustic neuroma, acceptable results were obtained for the selected dosimetric method according to the gamma analysis criteria.

Keywords: radiochromic films, CyberKnife, stereotactic

2990

Poster Discussion

Monte Carlo calculated beam quality correction factors for ionization chambers in carbon ion beams