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Videodensitometry versus digital calipers for quantitative coronary angiography.

H D Theron¹, C R Lambert, C J Pepine

¹Division of Cardiology, University of Florida, Gainesville.

The American Journal of Cardiology

|November 15, 1990

Summary

Digital calipers offer a comparable alternative to videodensitometry for measuring coronary artery dimensions. This study found high correlation and low variability for both methods in assessing arterial diameter and area.

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Area of Science:

Cardiovascular Imaging
Medical Device Technology

Background:

Accurate measurement of coronary artery dimensions is crucial for diagnosing and managing cardiovascular diseases.
Videodensitometry (XR-70 system) and digital calipers are methods used for arterial dimension analysis.

Purpose of the Study:

To prospectively compare the accuracy and variability of videodensitometry and handheld digital calipers for measuring arterial dimensions and stenosis.
To evaluate intraobserver and interobserver variability for both measurement techniques.

Main Methods:

Analysis of single-plane left coronary angiograms from 18 patients.
Measurement of 648 arterial segments using videodensitometry (XR-70 system) and digital calipers.
Comparison of cross-sectional area and diameter measurements, including analysis of variability across different arterial sizes.

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Main Results:

Highly significant correlations were found between videodensitometry and caliper measurements for both cross-sectional area (r = 0.96, p = 0.0001) and diameter (r = 0.95, p = 0.0001).
Slightly higher variability was noted for area measurements in larger arterial segments (>10 mm²) using calipers.
Low intra- and interobserver variability was observed for both methods across all arterial sizes.

Conclusions:

Handheld digital calipers provide results comparable to videodensitometry (XR-70 system) for estimating luminal area and diameter in coronary arteries.
Both methods demonstrate low variability, suggesting reliability for clinical application in assessing arterial dimensions.