ESTRO 2024 - Abstract Book

S3716

Physics - Dose prediction, optimisation and applications of photon and electron planning

ESTRO 2024

Results:

The time required for treatment planning transitioned from an initial span exceeding 60 minutes to a reduced duration of 7 minutes. The new script led to a mean dose reduction of 2.9% to the rectum and 1.3% to the bladder while maintaining target dose coverage of V100[%]> 95%. The blind survey revealed that the automated plans were as good or better than the clinically delivered plans based on DVH and isodose lines. After a gradual clinical implementation, human errors due to repetitive tasks diminished, productivity increased regarding quantity of patients planned, and physicians reported higher satisfaction with the standardized dosimetry.

Conclusion:

The introduction of an automated dosimetry software for prostate treatment planning resulted in significant improvements in patient care and an optimized department time management. Additionally, the script bolstered motivation among dosimetrists, enabling them to focus on more complex cases. The automated dosimetry script allows uniform planning with room for manual adjustments in exceptional cases, thus expanding clinicians' acceptance of software-based solutions beyond traditional clinical practices. The next step in the project will be to transpose this workflow to every prostate prescription.

Keywords: Automation, standardization, prostate irradiation

2922

Digital Poster

Evaluation of tomotherapy plans for head and neck patients using RayStation and Precision

Rodrigo Astudillo Olalla 1 , Noelia Suárez Álvarez 1 , Marina Gutiérrez Ruiz 1 , Fernando Gómez Enríquez 2 , Guillermo Camacho de la Vega 1 , Jorge Alonso Muriedas 3 , Rosa Fabregat Borrás 1 , Samuel Ruiz Arrebola 1 , Uriel Alexander Corro Verde 1 , Veronica Cañon Garcia 1 , Juan Ignacio Raba Diez 1 , Ana Reguilon Martin 1 , Javier Uzquiza Lopez 1 , Paula Delgado Tapia 1 , Maria Teresa Pacheco Baldor 1 1 Hospital Universitario Marqués de Valdecilla, Radiation Oncology department, Santander, Spain. 2 Zamora Hospital, Medical Physics and Radiation Protection department, Zamora, Spain. 3 University Hospital of Cruces, Medical Physics and Radiation Protection department, Barakaldo, Spain

Purpose/Objective:

The treatment planning system (TPS) RayStation (RaySearch Laboratories), in its version 8A, incorporated helical tomotherapy linear accelerators as one of the available options for designing radiotherapy treatments. These systems are known for their ability to perform highly modulated helical treatments with a narrow beam along the longitudinal axis, where the patient enters the gantry for treatment. Prior to RayStation, one of the only treatment planners for tomotherapy was Precision (Accuray) and its optimizer, VOLO (Accuray).