S1739
Physics - Dose prediction/calculation, optimisation and applications for particle therapy planning
ESTRO 2026
Figure 1. Dosimetric indices for PTV Results:
Figure 2. Dosimetric indices for OAR Conclusion:
Scores for every parameter analyzed are shown in Figure 1 for OARs and in Figure 2 for PTVs. Statistically significant differences were found between both methodologies for CIPaddick, GIPaddick, and CILomax, for Dmax and Dmean in the PTV, and also in V26Gy for Brain and Dmax for Left cochlea. The OARs analyzed are were located far from critical structures and received doses below the recommended limits with both techniques.
The dedicated system offers higher conformity and sharper dose fall-off around the target, characteristic of stereotactic techniques, due to the heterogeneous dose distribution. References: 1.Lomax NJ, Scheib SG. Quantifying the degree of conformity in radiosurgery treatment planning. Int J Radiat Oncol Biol Phys. 2003; 55(5): 1409– 19. https://doi.org/10.1120/jacmp.v12i2.3449 2. Paddic k I. A simple scoring ratio to index the conformity of radiosurgical treatment plans. Technical Note. J Neurosurg. 200; 93 Suppl 3: 219– 2. https://doi.org/10.3171/jns.2000.93.supplement_3.0 2193.Shaw, Edward et al. Radiation therapy oncology group: Radiosurgery quality assurance guidelines. International Journal of Radiation Oncology, Biology, Physics, Volume 27, Issue 5, 1231 – 1239. https://doi.org/10.1016/0360-3016(93)90548-A Keywords: Radiosurgery, Dosimetry
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