ESTRO 2024 - Abstract Book

S3290

Physics - Detectors, dose measurement and phantoms

ESTRO 2024

measurements were present at dose maximum but only 5 mm from the dotted line the dose profiles coincide (e). Investigating the agreement in the full volume of interest, VOI 50, 3D gamma evaluation was carried out. With three different global gamma criteria the pass rate resulted in 99.9% (5%/5mm), 96.5% (3%/3mm), and 92.2% (3%/2mm) when the TPS volume was used as reference.

Conclusion:

This study has demonstrated an end-to-end dosimetric verification of a stereotactic treatment of multiple brain metastases using a HyperArc delivery. Using true 3D NIPAM polymer gel dosimetry measurement, with MRI as read out method, a very good agreement between the planned and delivered absorbed dose was shown.

Keywords: gel dosimetry, 3D dose verification, HyperArc

References:

[1] Celena YY, Dinç O, Arslan ND, Dag S, Dog an AK, Günenç S. Hyperarc Vmat and Vmat planning for stereotactic radiosurgery in multiple brain metastases. Journal of Radiation Research and Applied Sciences 16 (2023) 100719

[2] De Deene Y (2022) Radiation Dosimetry by Use of Radiosensitive Hydrogels and Polymers: Mechanisms, State-of the-Art and Perspective from 3D to 4D. Gels 8, 599.

[3] Senden RJ, De Jean P, McAuley KB, Schreiner LJ. Polymer gel dosimeters with reduced toxicity: a pre- liminary investigation of the NMR and optical dose response using different monomers. Phys.Med. Biol. 2006; 51: 3301–3314. PMID: 16825731 [4] Ceberg S, Gagne I, Gustafsson H, Scherman JB, Korreman SS, Kjær-Kristoffersen F, Hilts M, Bäck SÅJ. RapidArc treatment verification in 3D using polymer gel dosimetry and Monte Carlo simulation. Phys Med Biol. 2010 Sep;55(17):4885-98.

1770

Proffered Paper

On-the-fly dose reconstruction from in-beam PET activation

Victor Valladolid-Onecha 1,2 , Andrea Espinosa-Rodriguez 1,2 , Fernando Arias-Valcayo 1,2 , Samuel España 1,2 , Sara Gaitán Dominguez 1,2 , Miguel García-Diez 1,2 , Paula Ibáñez 1,2 , Daniel Sanchez-Parcerisa 1,2 , Cayetano Soneira-Landín 1,2 , Fernando Cerrón-Campoó 3 , Juan Antonio Vera-Sanchez 3 , Alejandro Mazal 3 , Luis Mario Fraile 1,2 , Jose Manuel Udias 1,2 1 Universidad Complutense de Madrid, Grupo de Física Nuclear, EMFTEL & IPARCOS, Madrid, Spain. 2 Instituto de Investigación del Hospital Clínico San Carlos (IdISSC), CEI Moncloa, Madrid, Spain. 3 Centro de Protonterapia Quironsalud, Quironsalud, Madrid, Spain