ESTRO 2024 - Abstract Book

S5850

RTT - Education, training, advanced practice and role developments

ESTRO 2024

4. Ahead Guidelines The Principles in Practice. (2017). Ahead.ie. Available at: https://www.ahead.ie/udl-practice (Accessed 3/10/23)

3066

Digital Poster

Feasibility evaluation of RTT-only CBCT-guided daily online adaptive radiotherapy for prostate tumor

Paolo Caricato 1 , Sonia Sapignoli 1 , Matteo Sepulcri 2 , Sara Cipriano 3 , Ashlyng Esthefany Rivas Surey 3 , Andrea Bettinelli 1 , Federica Guida 1 , Marco Andrea Rossato 1 , Marco Krengli 2 , Marta Paiusco 1 1 Veneto Institute of Oncology IOV-IRCCS, Medical Physics Department, Padova, Italy. 2 Veneto Institute of Oncology IOV-IRCCS, Radiation Oncology Department, Padova, Italy. 3 University of Padova, Medicine Department (DIMED), Padova, Italy

Purpose/Objective:

Online Adaptive Radiotherapy (oART) has recently become popular with the development of dedicated LINACs for ART. The AI-driven Varian Ethos solution, which has been installed at our Institute, provides tailored patient care utilizing daily cone beam computed tomography (CBCT) images. For each fraction, the physician has to select between two alternative plans (Scheduled and Adapted plans) generated by Ethos. This study aimed to investigate the feasibility of involving Radiation Therapy Technicians (RTTs) more extensively into the workflow of CBCT-guided oART for patients with localized prostate carcinoma using Ethos platform in order to reduce the physician workload.

Material/Methods:

A retrospective study was conducted on the first ten patients who underwent oART for localized prostate neoplasia at our Institute. All patients were treated according to the hypofractionation CHHiP protocol, receiving 60 Gy delivered over 20 sessions. All treatment plans were delivered using the 9-field Intensity-Modulated Radiation Therapy (IMRT) technique, optimized through the Ethos Treatment Planning System. The Ethos Autocontouring tool was employed for this study.

Two RTTs underwent through offline training, supervised by two physicians and two medical physicists, to acquire the necessary skills for managing an oART process.This training program was divided into two distinct phases:

1. Contouring Phase: supervisors teached RTTs to recognize anatomical structures in the pelvic region and to contour these structures accurately on both CT and CBCT images. 2. Plan Evaluation Phase: RTTs were trained to evaluate treatment plans in accordance with a prioritization scheme for anatomical structures (1. Prostate gland - CTV, 2. PTV, 3. Rectum, 4. Bladder, 5. Femoral Heads), established by the supervisors.