Figure 1. Posteroanterior angiograms. Left: Digital subtraction angiogram in a patient with a short high-grade de novo stenosis (arrow) of the superficial femoral artery. Middle: Unsubtracted angiogram shows a catheter with a 10-cm-long segmented balloon used to center the 192Ir source in the artery. The centering catheter overlapped the length of stenosis by at least 1 cm at both sides. Patients received anticoagulant therapy during inflation of the balloon of the centering catheter to avoid blood clotting. Right: Digital subtraction angiogram shows the result of PTA performed in the same patient.