Key result
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%.
Why the study?
Is the densitometric method more accurate than the geometric method for quantifying area patency using single-plane digital subtraction angiography?
Observational
Is the densitometric method more accurate than the geometric method for quantifying area patency using single-plane digital subtraction angiography?
The densitometric method provides a more accurate quantification of arterial patency than the geometric method using single-plane digital subtraction angiography.
Densitometric quantification may improve accuracy over geometric methods in single-plane DSA; leaves open prospective validation before clinical adoption.
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.
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Key et al. (1987) conducted an 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%.