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The impact of vessel and catheter position on the measurement accuracy in catheter-based quantitative coronary angiography

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Abstract

Background: The calculation of absolute artery dimensions in quantitative coronary angiography is usually carried out by catheter calibration. It is based on the proportional comparison of the dimension of the imaged artery segment to the dimension of the imaged angiographic catheter of known size. This calibration method presumes an identical radiographic magnification between angiographic catheter and artery segment of interest. However, due to the different intrathoracic location of both objects the radiographic magnification or calibration factor is often not identical for a given angiographic projection. The aim of this study was to quantify the magnification error (out-of-plane magnification error) for the major coronary artery segments imaged in frequently used angiographic projections. Methods The intrathoracic spatial location of 468 coronary segments (RCA 196, LAD 156, LCX 116) and their respective coronary catheters were established with biplane angiography and known imaging geometry data. The error in the radiographic magnification or calibration factor was then calculated for all 936 monoplane projections using the spatial coordinates and imaging geometry data. Results The mean magnitude of magnification error was 4% within all 936 measurements. The magnitude and direction of error varied with the lesion localization and the angiographic projection angle (range −12.6% to +10.6%). The error characteristics could be described with six typical error groups by stratifying the data according to the three main coronaries and two angiographic planes. In 24% of measurements, the magnification error exceeded the 5.2% error limit acceptable for reference vessel sizing. Measurements of left coronary arteries were mainly affected by it. Conclusion: The magnification error contributes to the calibration error in measuring arterial dimensions by quantitative angiography. This error may affect the reliability of clinical studies and the proper sizing of interventional devices. These findings could be used to improve current error correction algorithms in order to reduce the effect of the magnification error in measuring arterial dimensions.

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Authors and Affiliations

  1. Department of Medicine II, Cardiology and Pulmology, University Hospital Benjamin Franklin, Free University, Berlin, Germany

    Werner Wunderlich, Beate Roehrig, Frank Fischer, Hans-Richard Arntz, Rahul Agrawal, Andreas Morguet, Heinz-Peter Schultheiss & Dieter Horstkotte

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  1. Werner Wunderlich
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Wunderlich, W., Roehrig, B., Fischer, F. et al. The impact of vessel and catheter position on the measurement accuracy in catheter-based quantitative coronary angiography. Int J Cardiovasc Imaging 14, 217–227 (1998). https://doi.org/10.1023/A:1006067117225

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