ESTRO 2024 - Abstract Book

S5591

RTT - Patient care, preparation, immobilisation and IGRT verification protocols

ESTRO 2024

the SGRT system in the new workflow. Further research needs to be done to look into PTV margin reduction from two to one millimeter.

Keywords: SGRT, SRS, Head adjuster

References:

1. Wiant D, Squire S, Liu H, Maurer J, Lane Hayes T, Sintay B. A prospective evaluation of open face masks for head and neck radiation therapy. Pract Radiat Oncol. 2016;6(6):e259-e267

2. Li G, Lovelock DM, Mechalakos J, Rao S, Della-Biancia C, Amols H, Lee N. Migration from full-head mask to "open face" mask for immobilization of patients with head and neck cancer. J Appl Clin Med Phys. 2013;14(5):243-54.

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Digital Poster

Impact of coaching reinforcement on SGRT-guided abdominal SBRT with expiration breath-hold (EBH)

Sonia Bermejo 1 , Cristina Ansón 2 , Pablo Carrasco 2 , Jéssica Jiménez 1 , Noé Ventosa 1 , Guillermo Gómez de Segura 2 , Josep Balart 1 , Eugènia Otero 1 , Ainoa Vizuete 1 , Javier Domenech 1 , Fabià Suriñach 1 , Ana Soto 1 , Núria Farré 1 , Núria Jornet 2 , Gemma Sancho 1 1 Hospital de la Santa Creu i Sant Pau, Radiation Oncology, Barcelona, Spain. 2 Hospital de la Santa Creu i Sant Pau, Medical physics, Barcelona, Spain

Purpose/Objective:

Abdominal SBRT treatments in breath hold inspiration guided by SGRT have shown an improvement on intrafraction motion control. However, this comes with the cost of more treatment interruptions if the patient surface moves outside the SBRT thresholds. Therefore, the training of these patient becomes crucial.

This study evaluates the impact of adding an extra training session for patients treated with EBH abdominal SBRT regarding fraction treatment time.

Material/Methods:

Six patients diagnosed with pancreatic or hepatic tumours and treated in EBH with SBRT were studied. Patients were positioned on a SBRT board (CIVCO) equipped with a vacuum bag and a thorax support. All patients were treated with a TrueBeam linear accelerator (Varian). Treatment was delivered using VMAT technique with 10 FFF X-ray beam in 3 or 5 fractions.

The SGRT surface monitoring system used for this study was AlignRT (VisionRT).