Abstract
Conformality has been a key requirement in radiation therapy for cancer to minimize normal tissue toxicity while maintaining tumor control. Since 2014, there has been great interest in ultra-high dose rate (UHDR), "FLASH," radiation therapy to enhance this therapeutic window. In multiple pre-clinical studies, it was seen that normal tissue demonstrated less damage due to radiation of various modalities when the same dose was delivered at ultra-high mean dose rates exceeding ∼40Gy/s while tumor control remained indifferent to changes in dose rate. The scientific community has large-scale interdisciplinary studies to investigate this potentially breakthrough technique to enhance treatment options for cancer. FLASH studies have been performed using a number of modalities and delivery techniques for many pre-clinical models. There have been several studies reporting evidence of the FLASH effect as well as technological developments relating to UHDR studies. There is sustained interest and motivation for this topic as well as many questions that are yet to be answered. We provide a short overview to highlight some of the major work and challenges to advance research in FLASH radiotherapy.
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