Digital subtraction coronary angiography using high‐pass temporal filtration: A comparison with cineangiography

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Abstract
Selective coronary angiograms were obtained using a real‐time high‐pass temporal filtration digital subtraction technique with videotape storage and display and compared to simultaneously recorded 35‐mm cineangiograms for 32 stenotic lesions in 15 patients. Both methods were evaluated by three independent observers using caliper measurement of percent diameter reduction for each lesion. There was a good correlation between the two imaging methods for individual observers, though considerable variability was seen, r = .73, standard error of estimate (SEE) = 9.1%. The average severity of stenosis and the interobserver variability were similar between methods. This digital subtraction technique for selective coronary angiography compares favorably with a conventional film‐based technique for evaluation of coronary stenoses and offers advantages of real‐time image processing, limited tolerance to patient motion, and relatively small digital memory requirements. In addition to further improvements in image quality, more objective computer‐aided scoring methods are needed to reduce the variability in lesion analysis.