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Comparative validation of quantitative coronary angiography systems. Results and implications from a multicenter
1Cardiac Catheterization, Intracoronary Imaging, Erasmus University, Rotterdam, the Netherlands.
Circulation
|April 15, 1995
Summary
Performance of quantitative coronary angiography (QCA) systems varies significantly. This variability impacts the comparability of results across studies and clinical applications, necessitating adjustments in trial design and algorithm refinement.
Area of Science:
- Cardiovascular imaging
- Medical device evaluation
- Interventional cardiology
Background:
- Quantitative coronary angiography (QCA) is crucial for assessing coronary interventions.
- Objective evaluation of QCA system performance is essential due to reliance on these systems for scientific understanding.
- Variability in QCA systems could affect stenosis assessment and treatment strategies.
Purpose of the Study:
- To objectively evaluate and compare the performance of 10 different computerized quantitative coronary angiography (QCA) systems.
- To identify and quantify the variability in accuracy and precision among these QCA systems.
- To assess the implications of QCA system variability on multicenter angiographic trials and clinical practice.
Main Methods:
- Validation of 10 QCA systems at North American and European core laboratories.
- Cine films of phantom stenoses (0.5-1.9 mm) were analyzed under in vivo and in vitro conditions.
- Automated analysis without observer interaction, with performance metrics including accuracy, precision, correlation, SEE, intercept, and slope.
Main Results:
- Significant performance variability was observed across the 10 QCA systems.
- Accuracy ranged from +0.07 to +0.31 mm, precision from +/- 0.14 to +/- 0.24 mm.
- Correlation coefficients (r) ranged from .96 to .89, indicating wide differences in measurement reliability.
Conclusions:
- Marked variability in QCA system performance exists for stenosis assessment between 0.5 and 1.9 mm.
- Absolute luminal diameter measurements from different trials may not be directly comparable due to system variability.
- Study designs and power calculations for angiographic trials must account for QCA system precision to ensure reliable detection of small differences.