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Fig. 4B —61-year-old man with rest pain in both feet that is worse in
right foot. Digital subtraction angiography shows patent right common femoral
artery to above-knee popliteal artery bypass graft. Note that focal areas of
decreased lumen diameter on MR angiogram correspond to levels of metallic
surgical clips (arrows) located around graft and at distal
anastomosis site. Metallic susceptibility artifact can be recognized by
characteristic signal buildup at edge of signal void area due to intravoxel
phase distortions.
