ESTRO meets Asia 2024 - Abstract Book

S390

RTT – Treatment planning, OAR and target definitions

ESTRO meets Asia 2024

and a lower absorbed dose in the ORAs, we conclude that the best plan is the one that is formed by 4 arcs (one started in 60º and finished in 220º and the other one started in 200º and finished in 220º).

Keywords: Radiotherapy, breast, VMAT

References:

[1] Thirion, P., Fontaine, J., Louvel, G., & Caudrelier, J. M. (2021). Volumetric modulated arc therapy (VMAT) for breast cancer: A planning study focusing on the dosimetric impact of multileaf collimator width on dose distribution in the boost area. Clinical and Translational Radiation Oncology, 26, 69-74. [2]Jagsi, R., Falchook, A. D., Hendrix, L. H., Curry, H., Chen, R. C., & Anderson, K. E. (2017). Adoption of hypofractionated radiation therapy for breast cancer after publication of randomized trials. International Journal of Radiation Oncology* Biology* Physics, 98(1), 39-47.

[3]Dinkla, A. M., Kroon, P. S., Visser, R., Kippersluis, S., & de Bois, J. (2016). Improved VMAT delivery for the treatment of thoracic esophageal cancer. Physics in Medicine & Biology, 61(7), 2523-2537.

[4]Hussain, A., & Villarreal-Barajas, J. E. (2018). Clinical evaluation of Monaco treatment planning system based VMAT in prostate cancer: a comparison with beam's eye view and fluence map optimization techniques. Journal of Radiotherapy in Practice, 17(3), 266-275.

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Digital Poster

Assessment of Different Planning Strategies for Patients with Hip Prostheses in Radiotherapy.

CARMEN GIL LOPEZ

Radiofisica, Hospital Son Espases, Palma de Mallorca, Spain

Purpose/Objective:

Volumetric Modulated Arc Therapy (VMAT) is currently one of the most common techniques for cancer patients undergoing external beam radiotherapy due to its multiple advantages and good dose conformity. When evaluating a treatment plan, we often encounter high-Z metallic elements such as hip prostheses, which increase the complexity of planning as they attenuate the beam significantly. In this study, we will compare the exclusion segments and "Avoidance Structures" tools, which prevent direct beam entry into a structure during optimization, for different pathologies in patients with hip prostheses.

Material/Methods:

A. Material:

We used the Eclipse® version 13.6 treatment planning system from Varian Inc., the "Varian Clinac DHX 2100" accelerator, and the exclusion segments and Avoidance Structures tools.

B. Methods: