Objective examination quality
CIA
SECONDARY
One radiographer performed the analysis of objective examination quality (OEQ).ROIs were placed manually in the AA at the mid-point between the renal arteries and the aortic bifurcation and bilaterally in.the common iliac arteries (CIA) at the mid-point between the aortic bifurcation and internal iliac artery,the superficial femoral arteries (SFA) 10 cm below the branching of the deep femoral artery, andthe P3 segment of the popliteal artery (PA).Each ROI was drawn as large as possible to assess as much of the arterial lumen as possible without including the arterial wall or plaques. ROIs were copied and pasted in the VMI series to ensure measurements from identical areas. We recorded VA and standard deviation (SD). Background attenuation was measured in the closest muscle. OEQ was defined as VA (primary outcome), noise, CNR, and SNR (secondary outcomes). Noise was defined as SD of VA