ESTRO 2024 - Abstract Book

S4793

Physics - Quality assurance and auditing

ESTRO 2024

(11 measurements showed a passing rate lower than 90%). Radiochromic film results showed a good agreement within 5% with long radiation field method measurements.

Conclusion:

Long radiation field method provides a more accurate comparison between calculated and measured dose distributions than the standard method can do for larger radiation fields. Differences between long radiation field and Radiochromic film results were not significant for any of the measurements. These results suggest that long radiation field method can be adopted within the clinical practice for larger radiation fields verification.

Keywords: Pretreatment QA, Radiotherapy, Dosimetry

References:

Otavius 4D modular User Manual, PTW (2018).

Otavius 4D, Verification of long radiation fields, PTW.

P. Andreo, D. T. Burns, K. Hohlfeld, M. S. Huq, T. Kanai, F. Laitano, V. G. Smyth, and S. Vynckier. Absorbed Dose Determination in External Beam Radiotherapy: An International Code of Practice for Dosimetry based on Standards of Absorbed Dose to Water. IAEA Technical Reports Series no. 398. International Atomic Energy Agency, Vienna, 2000.

Kry, S.F., Molineu, A., Kerns, J.R., Faught, A.M., Huang, J.Y., et al. (2014) Institutional Patient-Specific IMRT QA Does Not Predict Unacceptable Plan Delivery. International Journal of Radiation Oncology*Biology*Physics, 90, 1195-1201

Roshan S. Prabhu et al. Volumetric Modulated Arc Therapy (VMAT) Craniospinal Irradiation (CSI) for Children and Adults: A Practical Guide for Implementation. Practical Radiation Oncology, Volume 12, Issue 2, (2022).

Goskel E et al., Evaluation of volumetric modulated arc therapy technique for cranio-spinal irradiation: A rando - phantom based dosimetric study. Int J Radiat Res. 2021

Knapp P et al., The role of volumetric modulated arc therapy (VMAT) in gynaecological radiation therapy: A dosimetric comparison of intensity modulated radiation therapy versus VMAT. J Med Radiat Sci. 2019.

B. Allgaier, E. Schüle e J. Würfel. Dose reconstruction in the OCTAVIUS 4D phantom and in the patient without using dose information from TPS. White Paper PTW, (2013).

Wu Y et al., A comparative dosimetric study of cervical cancer patients with para-aortic lymph node metastasis treated with volumetric modulated arc therapy vs. 9-field intensity-modulated radiation therapy. Ann Transl Med 2019;7(22):675.