Densitometric quantification of arterial patency using digital subtraction angiography was more accurate than the geometric method, with a mean systematic error of up to 4%.
Observational
Digital subtraction angiography (DSA) allows the degree of arterial patency or stenosis to be rapidly quantified. We have assessed the accuracy with which a single-plane DSA system is able to quantify area patency by densitometric and geometric methods. Arterial phantoms were designed to test for systematic error; intra-arterial DSA images of critical lesions of the carotid bifurcation and the lower abdominal and peripheral vessels were used to determine intra- and interobserver reproducibility. The densitometric method, which was more accurate than the geometric method, had a mean systematic error of up to 4% and a mean intra-observer variability of about 15% (coefficient of variation). We have identified the principal sources of inaccuracy and ways in which it may be reduced.
Key et al. (Sun,) conducted a observational in Atherosclerosis. Densitometric method for digital subtraction angiography vs. Geometric method was evaluated on Accuracy of area patency quantification (systematic error and intra-observer variability). Densitometric quantification of arterial patency using digital subtraction angiography was more accurate than the geometric method, with a mean systematic error of up to 4%.