Click on image to view larger version.
Fig 8. Pearson correlation between the mean carotid stenosis narrowest diameter (mm) and the mean calculated stenosis area (mm2). As anticipated, there was perfect correlation between the 2 methods of stenosis quantification at 1.0 (n = 176). A regression curve was plotted over the data, showing that the ability to predict the calculated area from the stenosis diameter is perfect with an R2 value of 1.0. This is expected, because the calculated area is based on the diameter measurements. The data provide a graphic example of the nonlinear relationship between the narrowest diameter and the area, which demonstrates that minimal changes in the diameter of the carotid lumen cause more dramatic changes in the area of the lumen.
