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The averaged dynamic changes in rBF (a), ΔHb (b) and ΔHbO2 (c) over the 11 patients at different weeks. Data obtained during the fractional radiation deliveries (beam-on intervals) or between the fractional deliveries (beam-off intervals) were averaged separately. A small but significant difference in ΔHbO2 (−0.29 ± 0.12 µM) was observed between the x-ray beam-on and beam-off at Week 1 (* represents p = 0.03).
