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Figure 4 Rate of restenosis (RS) occurring at the proximal and distal radiation fall-off zones in gamma-, beta-, and placebo-treated patients. The rates of restenosis where a fall-off of the radiation dose occurs (ellipse surrounding each radiation source edge) are shown in the graphic. Black bars = gamma vascular brachytherapy (VBT); striped bars = beta VBT; black bars = placebo.