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Background and Purpose: Catheter-based coronary brachytherapy with β- and γ-radiation is an evidence-based method to prevent restenosis after percutaneous transluminal coronary angioplasty (PTCA) and stent implantation, but the outcome may be subject to improvements. Physiological studies suggest that most of the target cells of brachytherapy in coronary arteries after PTCA are hypoxic. A lack of...