ESTRO 2023 - Abstract Book

S786

Monday 15 May 2023

ESTRO 2023

Conclusion Phase-dependent proton dose calculation for lung cancer patients is feasible using ScatterNet for 4DCBCT intensity correction. IMPT plans based on network images showed comparable quality to those of the non-deep learning 4D scatter correction workflow. A substantial reduction in computational time (scatter correction for all phases per patient decreased from more than 10 min to a few seconds) makes this CNN method potentially interesting for daily clinical decisions such as the necessity of replanning.

Proffered Papers: Multidisciplinary advancement in stereotactic arrythmia radiotherapy

OC-0939 Cardiac SABR: image matching techniques for accurate treatment delivery R. Brooks-Pearson 1 , K. Pilling 1 , B. Ormston 1 , L. MacKenzie 1 , C. Huntley 2 , A. Kerr 2 , R. Crouch 3 , N. Richmond 1 , M. Van Der Putten 1 , P. Atherton 1 1 Newcastle upon Tyne Hospitals NHS Foundation Trust, Northern Centre for Cancer Care, Newcastle upon Tyne, United Kingdom; 2 South Tees Hospitals NHS Foundation Trust, Radiotherapy, James Cook University Hospital, Middlesbrough, United Kingdom; 3 Sheffield Teaching Hospitals NHS Foundation Trust, Radiotherapy, Weston Park Hospital, Sheffield, United Kingdom Purpose or Objective Cardiac SABR is a novel technique to treat non-malignant heart disease. Ventricular tachycardia is an irregular heartbeat conventionally treated using invasive cardiac catheter ablation and medication. However, when these standard treatments have been exhausted, cardiac SABR provides a final treatment option to this high-mortality condition. Complex diagnostic mapping and planning scans enable the cardiologist and clinical oncologist to delineate the target for a 25Gy single fraction. However, organs at risk (OAR) near the target make this treatment challenging to plan and deliver. The image below shows planning volumes and image quality of the planning CT compared to the treatment CBCT. Publications from cardiologists report the efficacy of cardiac SABR, however there is limited data on the treatment delivery of this complex procedure. To the best of our knowledge, this is the first study to investigate radiographer CBCT image matching techniques for cardiac SABR.