ESTRO 2024 - Abstract Book

S3331

Physics - Detectors, dose measurement and phantoms

ESTRO 2024

Conclusion:

In this study, the response of RPLGD dosimeters outside the treatment field was investigated. A better definition of the energy calibration factors will improve the accuracy of out-of-field dose measurement in phantoms or in patients. Complementary measurements will be conducted to reduce uncertainties of the calibration factors and enlarge the beam qualities investigated.

This work has benefited from the grant ANR-21-RHU5-0005 within the FRANCE2030 investment plan.

Keywords: Out-of-field, Radiophotoluminescent, dosimetry

References:

[1] Kry SF, Bednarz B, Howell RM, Dauer L, Followill D, Klein E, Paganetti H, Wang B, Wuu CS, George Xu X. AAPM TG 158: Measurement and calculation of doses outside the treated volume from external-beam radiation therapy. Med Phys. 2017 Oct;44(10):e391-e429. doi: 10.1002/mp.12462. Epub 2017 Aug 20. PMID: 28688159.

[2] F. de Kermenguy et al., “Radio-induced lymphopenia in the era of anti-cancer immunotherapy,” in International Review of Cell and Molecular Biology, Academic Press, 2023. doi: 10.1016/bs.ircmb.2023.03.002.

[3] Howell, R.M., Scarboro, S.B., Kry, S.F., Yaldo, D.Z., 2010a. Accuracy of out-of-field dose calculations by a commercial treatment planning system. Phys. Med. Biol. 55, 6999–7008. https://doi.org/10.1088/0031-9155/55/23/S03

[4] Colnot, J., Zefkili, S., Gschwind, R., Huet, C., 2021. Out-of-field doses from radiotherapy using photon beams: A comparative study for a pediatric renal treatment. J. Appl. Clin. Med. Phys. https://doi.org/10.1002/acm2.13182

[5] Scarboro SB, Followill DS, Howell RM, Kry SF. Variations in photon energy spectra of a 6 MV beam and their impact on TLD response. Med Phys. 2011 May;38(5):2619-28. doi: 10.1118/1.3575419. PMID: 21776799; PMCID: PMC3107829.

2377

Digital Poster

Calibration procedure and clinical validation of an high resolution diode array in Tomotherapy

Tiago Ventura, Miguel Capela, Sofia Silva, Tania Santos, Josefina Mateus, Maria do Carmo Lopes

IPO Coimbra, Medical Physics Department, Coimbra, Portugal

Purpose/Objective:

SRS for single brain metastasis and lung SBRT treatments have been performed at our institution in a Tomotherapy unit since 2016. The established patient specific quality assurance (PSQA) verifications include ionization chamber