(Thursday, 7/16/2020) 1:00 PM - 3:00 PM [Eastern Time (GMT-4)]
Room: Track 3
Re-irradiation is becoming commonplace in academic and community radiation oncology clinics around the world. In many cases, medical physicists are playing a key role in the determination of appropriate re-irradiation doses and planning strategies. It is crucial that medical physicists understand the knowledge factors associated with participating in re-irradiation consults and contribute to standardization in this area when possible. In this session, we will review the literature on re-irradiation and the scope and limitations of our clinical, physics, and radiobiological knowledge of retreatment with radiation therapy across a range of body sites. Next, we will discuss the current strategies being employed for treatment planning in re-irradiation cases as well as the approach for medical physics evaluation and consults as part of a routine clinical workflow. We will provide an overview of the radiation biology concepts behind re-irradiation and what evidence can be used to justify different radiobiological corrections for various retreatment scenarios. Finally, we will discuss approaches to re-irradiation across the world, specifically the Pan-Canadian and UK strategies for radiotherapy retreatment case evaluation, consult, and overall goals.
Learning Objectives:
1. What are the range of approaches that clinics are using to design dose limits in re-irradiation?
2. How are clinics using special medical physics consults to quantify combined dose measures?
3. What are the biological effects that need to be considered in toxicity models for re-irradiation?
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