ESTRO 38 Abstract book

S364 ESTRO 38

verification of a ground-truth anthropomorphic head phantom as well as its application for treatment planning, Monte Carlo dose calculation and range verification in particle therapy will be presented.

Debate: Workload/clinic logistics, and not technical uncertainties, are the main barrier to widespread implementation of adaptive RT practice

SP-0705 Practicalities and Not Technical Uncertainties Limit the Clinical Implementation of Adaptive Radiotherapy M. Velec 1 , E. Forde 2 1 Princess Margaret Cancer Centre, Radiation Medicine Program, Toronto, Canada ; 2 Trinity College Dublin, Discipline Of Radiation Therapy, Dublin, Ireland Abstract text Image-guided radiotherapy has revealed the dynamic nature of patients who can unexpectedly exhibit positioning variations, substantial organ motion and deformation, weight loss and tumour responses. This motion degrades the planned dose, decreases treatment quality and may impact clinical outcomes. Systematically adjusting for these patient-specific variations through adaptive plan modification can improve the therapeutic ratio in individual patients and enable planning target volume reduction thereby reducing dose to nearby radiosensitive structures. However, widespread clinical implementation of adaptive radiotherapy including evaluation in clinical trials has been slow. This is in part due to ongoing technical issues, including the accuracy of tools vital to adaptive radiotherapy; such as auto- segmentation, auto-planning, deformable registration, and uncertainty in defining responding clinical target volumes. Appropriate commissioning and QA of these processes combined with conservative adaptation for targets can potentially overcome these safely. Another more palpable barrier to implementation is that clinical workflows are not yet streamlined enough for patients and staff to be practicable. Routine radiotherapy processes that are required for adaptation, including repeat imaging, planning and QA, can increase workload and create bottlenecks in the clinic. These logistics may potentially be overcome with adequate clinical experience, which may include RTTs assuming greater responsibility and independence in decision making and developing expertise in adaptive tools. Debate on whether practicalities or technical uncertainties limit the clinical implementation of adaptive radiotherapy will provide the community with direction on where future efforts should be focused. Widespread use of adaptive strategies will ultimately improve the effectiveness of radiotherapy by accounting for dynamic patient changes, and ensuring tumour control while minimizing toxicities. SP-0706 Against the motion E.Forde 1 1 TCD Discipline of Radiation Therapy,Dublin,Ireland

POSTERS

Posters

Abstract not received

Plenary Session: Closing debate: Data mining or data farming?

ESTRO 38 Clinical Posters

SP-0707 For the motion TBC

Poster: Clinical track: Head and Neck

SP-0708 Against the motion TBC

PO-0709 External beam radiotherapy for metastatic lesions of differentiated thyroid cancer