ESTRO 2022 - Abstract Book

S857

Abstract book

ESTRO 2022

practice requiring increasing dosimetric appraisal for plan-of-the-day approaches, or contouring and optimization skills for online plan adaptation. Even as automation of these tasks offers gains in efficiency, online clinical decision making and oversight is being shifted within the multi-disciplinary team. For RTTs trained or ‘credentialed’ in adaptive workflows this presently often takes the form of delegation of daily plan approval with ad hoc team support available remotely. Proficiency with adaptive radiotherapy will greatly increase in the coming years as a result of clinical experience and automated tools. The clinical team will be poised to introduce more aggressive adaptive strategies and there are opportunities in this space to allow provide advanced practice RTT models with increasing autonomy. Finally, automation will not only streamline technical adaptive workflows but may also disrupt the current provision of supportive care which will require a high level of engagement from the multi-disciplinary team and patients.

SP-1000 Adaptation to tumour response during radiotherapy: Lessons learned in brachytherapy and how to transfer to EBRT

P. Petric

Switzerland Abstract not available

SP-1001 CBCT and MRI-based workflows for online adaptive radiotherapy

C.P. Behrens 1

1 Copenhagen University Hospital - Herlev and Gentofte, Oncology, Herlev, Denmark

Abstract Text With the introduction of new beasts in the zoo we call our current machine park we might be in the beginning of an Online Adaptive Radiotherapy (oART) era. There are oART workflows we can use today and others we should avoid. And it’s definitively not a one fits all situation. With real world examples and discussion points I’ll try to address some of the issues and solutions for current MR- and CBCT guided oART. The basic idea behind oART is simple. The patient change from fraction to fraction and thus the geometry of our irradiating beams should change accordingly. The basic principle behind treating with oART is likewise simple. We monitor the changes in the patient, define target volumes and organs at risk, and adapt the original treatment plan to fit the current situation. For (most) current oART the changes we adapt to are anatomical changes. Some of these changes can be monitored utilizing MR- and CBCT imaging available on dedicated treatment units. Workflows, pitfalls, and problems and solutions for oART utilizing these treatment units will be the focus of this talk. As always, the simple becomes more complicated when it meets the reality of real patients, limited image quality, time constraints, intra-fractional changes, system limitations, and knowledge gabs.

Symposium: HPV-related squamous cell carcinoma: Is it time for de-intensification?

SP-1002 Radiosenstivity of HPV-related SCC

T. Rieckmann Germany

Abstract not available

SP-1003 HPV+ HNSCC: Is it time for deintensification?

P- Blanchard France Abstract not available

SP-1004 HPV+ anal SCC: Is it a question of dose?

D. Gilbert UK Abstract not available

SP-1005 HPV+ cervix SCC

S- Chopra India

Abstract not available Debate: This house believes that short-course radiotherapy is the ideal schedule as part of total neoadjuvant therapy programs for rectal cancer