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Fig. 1B —Diagram illustrates technique used for optimized background
suppression, and graph shows acceptable contrast-to-noise ratios (CNRs) were
obtained. Sequential CNR curve progression at thigh and calf levels. First two
acquisitions are discarded and following three images are averaged to create
mask image (nonselective excitation). Slope of CNR curve is steeper and
reaches earlier plateau at thigh level (
) than calf level (•).
Because contrast medium was injected in both cases at proximal femoral level,
CNR curve is observably higher in femoropopliteal axis.
