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Figure 1 (A) Target segment (TS) is between proximal and distal margin of the target lesion, automatically defined by the quantitative coronary angiography system. Vessel segment (VS) is bordered by visible side branches, which encompass the target segment (TS) and the position of the angioplasty balloon and radiation source. (A') Original lesion in the middle part of the right coronary artery before intervention. (B) Injured segment (INS) is defined as the segment encompassed by the most proximal and most distal marker of the angioplasty balloon. (B') Arrows indicate the markers of the deflated angioplasty balloon filmed in place with a contrast injection. (C) The segment encompassed by the inner part of the two tungsten markers of the radiation delivery system defined as the irradiated segments (IRS). (C') Arrows indicate the inner parts of the radiation source tungsten markers filmed with a contrast injection.