Comparison of performance characteristics of different DSA-installations.

Standardized measurements of spatial resolution, contrast detectability, II entrance exposure and dynamic range were performed using simple and quick procedures for the assessment of performance characteristics. DSA-systems of different users and manufacturers can be compared with these performance criteria. Periodical measurements of performance are necessary to maintain a constant high image quality. The results of 10 DSA-systems demonstrate, that top of the line DSA-systems had a spatial resolution up to 1.2 lp/mm. and a contrast detectability up to 1 mm (10 mgI/ml) for an II-diameter of 22-26 cm.