Oxygen Consumption In Vivo by Ultra-High Dose Rate Electron Irradiation Depends Upon Baseline Tissue Oxygenation.

Purpose: This study aimed to assess the impact of tissue oxygen levels on transient oxygen consumption induced by ultra-high dose rate (UHDR) electron radiation in murine flank and to examine the effect of dose rate variations on this relationship.
Methods and Materials: Real-time oximetry using the phosphorescence quenching method and Oxyphor PdG4 molecular probe was employed. Continuous measurements were taken during radiation delivery on a UHDR-capable Mobetron linear accelerator. Oxyphor PdG4 was administered into the subcutaneous tissue of the flank skin 1 hour before irradiation. Skin oxygen tension (pO ₂ ) was manipulated by adjusting oxygen content in the inhaled gas mixture and/or by vasculature compression. A skin surface radiation dose of 19.8 ± 0.3 Gy was verified using a calibrated semiconductor diode dosimeter. Dose rate was varied across the UHDR range by changing linear accelerator cone length and pulse repetition frequency.
Results: The decrease in pO ₂ per unit dose during radiation delivery, termed oxygen consumption g-value (g _O2 , mmHg/Gy), was significantly influenced by tissue oxygen levels in the range 0 to 65 mmHg under UHDR conditions. Within the 0 to 20 mmHg range, g _O2 exhibited a sharp increase with rising baseline pO ₂ , plateauing at 0.26 mmHg/Gy. Dose rate variations (mean values, 25-1170 Gy/s; per pulse doses of 2.5-9.8 Gy) were explored by varying both cone length and pulse repetition frequency (10-120 Hz) with no significant changes in g _O2 . Conventional dose rate irradiation resulted in no discernible changes in pO ₂ .
Conclusions: The results show significant differences in the radiation-chemical effects of UHDR radiation between hypoxic and well-oxygenated tissues. Similar trends between earlier published in vitro and in vivo experiments presented herein suggest the chemical mechanisms driving the dependencies of g _O2 on pO ₂ are similar, potentially underpinning the FLASH effect. Importantly, significant variations in baseline pO ₂ were observed in animals kept under identical conditions, underscoring the necessity to control and monitor tissue oxygen levels for preclinical investigations and future clinical applications of FLASH radiation therapy.
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