Journal
BIOMEDICINES
Volume 9, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/biomedicines9020181
Keywords
ultra-high dose rate; normal tissue sparing; FLASH-radiotherapy; FLASH-radiobiology; therapeutic window
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FLASH radiotherapy is a new radiation delivery method aimed at widening the therapeutic window in radiotherapy, offering superior normal tissue sparing potential compared to conventional radiation. Research on FLASH is increasing in all main areas, though full understanding of radiobiological mechanisms is still to be clarified.
FLASH radiotherapy, or the administration of ultra-high dose rate radiotherapy, is a new radiation delivery method that aims to widen the therapeutic window in radiotherapy. Thus far, most in vitro and in vivo results show a real potential of FLASH to offer superior normal tissue sparing compared to conventionally delivered radiation. While there are several postulations behind the differential behaviour among normal and cancer cells under FLASH, the full spectra of radiobiological mechanisms are yet to be clarified. Currently the number of devices delivering FLASH dose rate is few and is mainly limited to experimental and modified linear accelerators. Nevertheless, FLASH research is increasing with new developments in all the main areas: radiobiology, technology and clinical research. This paper presents the current status of FLASH radiotherapy with the aforementioned aspects in mind, but also to highlight the existing challenges and future prospects to overcome them.
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