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Figure 1 A schematic diagram of the tandem positioning of the ³²P radiation source and an irradiated coronary artery with the anatomical and dose-based sub-segment definition. BRM = balloon radiopaque marker; CB = centering balloon; CBRM = centering balloon radiopaque marker; EIRL = effective irradiation length; EIRS = effective irradiated segment; INS = injured segment; IRL = irradiation length; IRS = irradiated segment; SB = side branch; SL = stent length; SrL = source length; SrRM = source radiopaque marker; VS = vessel segment.