ESTRO 2024 - Abstract Book

S5573

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

ESTRO 2024

2. Brand, D. H., A. C. Tree, P. Ostler, et al. 2019. "Intensity-modulated fractionated radiotherapy versus stereotactic body radiotherapy for prostate cancer (PACE-B): acute toxicity findings from an international, randomised, open-label, phase 3, non-inferiority trial." Lancet Oncol 20(11):1531-1543. 3. Widmark, A., A. Gunnlaugsson, L. Beckman, et al. 2019. "Ultra-hypofractionated versus conventionally fractionated radiotherapy for prostate cancer: 5-year outcomes of the HYPO-RT-PC randomised, non-inferiority, phase 3 trial." Lancet 394(10196):385-395. 4. Martin, J., P. Keall, S. Siva, et al. 2019. "TROG 18.01 phase III randomised clinical trial of the Novel Integration of New prostate radiation schedules with adJuvant Androgen deprivation: NINJA study protocol." BMJ Open 9(8):e030731. 5. King, Christopher R, James D Brooks, Harcharan Gill, et al. 2012. "Long-term outcomes from a prospective trial of stereotactic body radiotherapy for low-risk prostate cancer." International Journal of Radiation Oncology* Biology* Physics 82(2):877-882.

2193

Proffered Paper

Impact of Surface Guided Radiation Therapy (SGRT) on treatment delivery in Pediatric patients.

Sunil Murali Maurya, Prasad Raj Dandekar, Ajinkya Gupte, Amol Kakade, Ananda Jadhav, Sachin Rasal, Omkar Awate, Sanket Patil, Manish Bhosale, Vishal Singh, Alok Pathak

Sir H N Reliance Foundation Hospital & Research Centre, Radiation Oncology, Mumbai, India

Purpose/Objective:

Validation of Surface Guided Radiation Therapy (SGRT) as a set up and real time motion tracking technique has supported its recent adoption and inculcation in a large number of radiation oncology facilities. SGRT offers a broad spectrum of uses, encompassing tasks like real-time feedback for patient positioning, continuous monitoring during treatment sessions, and motion control (such as beam-gating during free-breathing or deep-inspiration breath-hold). In our institute, we have been using SGRT system AlignRT (Vision RT Ltd., UK) since 2014 for patient set up and intrafraction motion monitoring. Paediatric patients are more prone for intrafraction motion and run a significant risk of underdose to the PTV or overdose to OAR.[1] Utilization of SGRT for intra-fraction monitoring is not a widespread practice and there is limited existing literature on this subject. [2] In our institute, SGRT systems have been integrated into paediatric treatments as a safety measure to facilitate patient positioning and intrafraction motion monitoring. We use auto beam hold technique if the patient moves out of the tolerance limit. The objective of this study is to investigate the potential dosimetric impact on target coverage as a result of intra-fractional motion in paediatric patients treated with SGRT.

Material/Methods: