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Vessel diameter estimation in x-ray angiographic images using a watergauge algorithm

Conventional quantitative coronary arteriography techniques are limited for the case of small vessel diameters (diam 1.5 mm), both the watergauge algorithm and the derivative-based method produce similar results; however, for the small vessel (diam<1.5 mm), the watergauge algorithm yields better results. The success rate of the watergauge algorithm was substantially better than the derivative-based method for small vessel diameters with nonuniform or cluttered background.