ESTRO 2024 - Abstract Book

S350

Beachytherapy - Physics

ESTRO 2024

Keywords: Treatment planning, Optimisation, Cervical cancer

References:

1. Cibula D, Rosaria Raspollini M, Planchamp F, et al. ESGO/ESTRO/ESP Guidelines for the management of patients with cervical cancer – Update 2023. Radiotherapy and Oncology. 2023 2023/07/01/;184:109682.

2. Tanderup et al. GEC ESTRO/IBS/ABS treatment planning recommendations for BT in cervix cancer. Seminar at the GEC ESTRO gyn network meeting 1 December 2022 in Nice, France.

3. Tanderup K, Nesvacil N, Kirchheiner K, et al. Evidence-Based Dose Planning Aims and Dose Prescription in Image-Guided Brachytherapy Combined With Radiochemotherapy in Locally Advanced Cervical Cancer. Semin Radiat Oncol. 2020 Oct;30(4):311-327.

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Digital Poster

Absolute dose measurements using radiochromic films in 192 Ir and 60 Co HDR brachytherapy

Laura Oliver Cañamás 1 , Juan José Rovira-Escutia 2 , Javier Vijande-Asenjo 3,4,5 , Cristian Candela-Juan 6 , José Gimeno Olmos 7 , Mª Carmen Pujades-Claumarchirant 8 , José Ángel Martínez-Navarro 9 , Antonio Zaragozá-Carrillo 9 , Francisco García-Cases 9 , Facundo Ballester-Pallarés 3,4 , Jose Perez-Calatayud 4,7,10 1 Consorci Hospitalari Provincial de Castelló, Servei de Radiofísica i Protecció Radiològica, València, Spain. 2 Consorci Hospitalari General Universitari de Valèncioa, Servei de Radiofísica i Protecció Radiològica, València, Spain. 3 Universitat de València, Departamento de Física Atómica, Molecular y Nuclear, Burjassot, Spain. 4 Instituto de Investigación Sanitaria La Fe, Universitat de València, Unidad Mixta de Investigación en Radiofísica e Instrumentación Nuclear en Medicina, València, Spain. 5 Instituto de Física Corpuscular, Instituto de Física Corpuscular, Burjassot, Spain. 6 Hospital Clínic de Barcelona, Radiation Oncology Department, Barcelona, Spain. 7 Hospital Universitari i Politècnic La Fe, Servei d'Oncologia Radioteràpica, Unitat de Radiofísica, València, Spain. 8 Centro Nacional de Dosimetría, Centro Nacional de Dosimetría, València, Spain. 9 Hospital Universitari Sant Joan d'Alacant, Servicio de Radiofísica y Protección Radiológica, Alicante, Spain. 10 Hospital Clínica Benidorm, Radiofísica, Alicante, Spain The options available to independently verify absorbed dose distributions in brachytherapy (BT) are limited compared to those in external radiotherapy. In fact, there are no commercially available options for this purpose. Dose measurements in BT are especially challenging due to steep dose gradients, different angular incidences due to the different dwell positions and different energy ranges due to variations of the radiation spectra with the distance. Radiochromic films offer advantages over other detectors in this field due to their high spatial resolution, near water-equivalence, and their small angular-energy dependency in the energy range of interest in high-dose rate (HDR) BT. The objective of this work is to present a method and a phantom to perform absolute dose measurements using radiochromic films in HDR BT, comparing the obtained results with those of the treatment planning system (TPS), for either 192 Ir or 60 Co sources. Purpose/Objective: