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Semi-Automatic Graphical Tool for Measuring Coronary Artery Spatially Weighted Calcium Score from Gated Cardiac Computed Tomography Images

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Calcium scoring using 64-slice MDCT, dual source CT and EBT: a comparative phantom study.

Jaap M Groen¹, Marcel J W Greuter, R Vliegenthart

¹Department of Radiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.

The International Journal of Cardiovascular Imaging

|November 27, 2007

Summary

This summary is machine-generated.

Calcium scoring accuracy is affected by heart rate and scanner type. Dual-source CT (DSCT) shows less motion susceptibility than 64-slice MDCT, especially with thinner slices.

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Semi-Automatic Graphical Tool for Measuring Coronary Artery Spatially Weighted Calcium Score from Gated Cardiac Computed Tomography Images

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Area of Science:

Medical Imaging
Cardiovascular Imaging
Computed Tomography

Background:

Calcium scoring is crucial for assessing coronary artery disease risk.
Different CT scanner technologies (MDCT, DSCT, EBT) have varying performance characteristics.
Cardiac motion significantly impacts the accuracy of calcium scoring.

Purpose of the Study:

To evaluate calcium scoring accuracy across 64-slice MDCT, DSCT, and EBT scanners.
To assess the influence of heart rate, slice thickness, and calcium density on scoring results.
To quantify the susceptibility of calcium scoring to cardiac motion.

Main Methods:

Utilized artificial arteries with calcifications and a moving cardiac phantom.
Scanned at various heart rates (0-110 bpm) using MDCT, DSCT, and EBT.
Reconstructed images at 0.6 mm and 3.0 mm slice thicknesses; calculated Agatston, volume, and mass scores.

Main Results:

Calcium scoring remained stable up to 60 bpm, with deviations above 70 bpm.
Electron beam tomography (EBT) exhibited the lowest cardiac motion susceptibility (CMS index: 2.5).
Dual-source CT (DSCT) showed significantly lower CMS (3.6) compared to 64-slice MDCT (9.0).
Smaller slice thickness (0.6 mm) reduced CMS and the difference (Delta index) between CT modalities and EBT.

Conclusions:

Calcium scoring accuracy is dependent on heart rate, slice thickness, and the CT modality used.
DSCT is approximately 50% less susceptible to cardiac motion than 64-slice MDCT.
DSCT with 0.6 mm slice thickness provides a better approximation of EBT calcium scores than 64-slice MDCT.