What is segment involvement score on CCTA?

SIS counts the number of coronary segments with any plaque out of 18 standard segments. Higher SIS correlates with worse cardiovascular outcomes independent of stenosis severity.

How is plaque composition categorized?

Plaques are classified as calcified, mixed (calcified + non-calcified), or non-calcified. Low-attenuation non-calcified plaque carries the highest vulnerability risk.

What stenosis grade is obstructive on CCTA?

Stenosis >=50% luminal narrowing is considered obstructive and warrants consideration for functional testing or revascularization evaluation.

CCTA Plaque Burden Semi-Quantitative Score

Score coronary CT angiography (CCTA) plaque burden using semi-quantitative methods: segment involvement score, plaque composition, and stenosis grade.

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CCTA Plaque Burden Semi-Quantitative Score

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Frequently Asked Questions

What is segment involvement score on CCTA?

How is plaque composition categorized?

What stenosis grade is obstructive on CCTA?