Atherosclerosis-related measures in digitized femoral arteriograms.

Atherosclerosis is reflected in the arteriogram as narrowing of the arterial lumen and irregularity of the arterial wall. We have quantified these changes in digitized femoral arteriograms from 107 hypercholesterolaemic patients and defined 10 different measures concerning arterial diameter, cross-sectional area, stenosis and edge irregularity. We examined the precision of these measures and the correlations between them. Lumen volume and mean diameter for defined arterial segments had the highest precision and may be useful for follow-up studies. The linear correlation between the mean diameter and the square root of the lumen volume was greater than 0.99, so these two measures seem to be equivalent for all practical purposes. The measured variables could be separated into 2 groups: the measures concerning arterial diameter and lumen volume and those concerning edge irregularity and localized stenosis. The measures within each group showed strong positive mutual correlations, while the correlations between measures from different groups were negative and small. It was concluded that if the results of one measure from each group, suitably those of lumen volume and edge roughness, are known, the other described measures will add no further information about the atherosclerotic process.