Related Experiment Video
Updated: Jan 13, 2026
Identifying Coronary Artery Calcification on Non-gated Computed Tomography Scans
Published on: August 28, 2018
Coronary artery calcium identified on non-gated chest computed tomography guides downstream coronary computed
Anqi Yang1, Shuang Li1, Tian Ma1
1Department of Radiology, Beijing Friendship Hospital, Capital Medical University, Beijing, China.
Insights
Incidental coronary artery calcium (CAC) on chest CT impacts coronary CTA accuracy for obstructive coronary artery disease (CAD). Severe CAC significantly reduces diagnostic value, suggesting careful patient selection for coronary CTA.
Area of Science:
- Cardiovascular Imaging
- Radiology
- Diagnostic Accuracy
Background:
- Coronary artery calcium (CAC) extent influences coronary computed tomography angiography (CTA) diagnostic accuracy for obstructive coronary artery disease (CAD).
- Incidental CAC on non-gated chest CT may guide patient selection for coronary CTA.
- This study evaluates the impact of incidental CAC findings on non-gated chest CT on coronary CTA's diagnostic accuracy for obstructive CAD.
Purpose of the Study:
- To assess how incidental coronary artery calcium (CAC) detected on non-gated chest CT affects the diagnostic accuracy of coronary computed tomography angiography (CTA) for obstructive coronary artery disease (CAD).
Main Methods:
- Retrospective analysis of patients undergoing coronary CTA, with inclusion of those with prior chest CT and invasive coronary angiography (ICA) within one year.
- Semi-quantitative CAC scoring (absent, mild, moderate, severe) on non-gated chest CT.
- Diagnostic accuracy evaluated using area under the receiver operating characteristic curve (AUC), comparing coronary CTA to ICA across CAC severity subgroups.
Main Results:
- Overall AUC for coronary CTA was 0.609.
- Higher AUC observed in absent/mild CAC subgroups (0.650, 0.665).
- Reduced AUC in moderate/severe CAC subgroups (0.549, 0.491), with AUC < 0.5 in severe CAC indicating no diagnostic value. Obstructive CAD prevalence was highest in severe CAC group.
Conclusions:
- Coronary CTA demonstrates reduced effectiveness for stenosis assessment in patients with severe CAC on non-gated chest CT.
- Further research is needed to define optimal cut-off values for semi-quantitative CAC scoring to guide interpretation.
Background:
The diagnostic accuracy of coronary computed tomography angiography (CTA) for obstructive coronary artery disease (CAD) is influenced by the extent of coronary artery calcium (CAC). Incidental CAC findings on non-gated chest computed tomography (CT) may inform the selection of patients for subsequent coronary CTA. The purpose of this study was to evaluate how incidental CAC findings on non-gated chest CT affect the diagnostic accuracy of coronary CTA for obstructive CAD.
Methods:
We retrospectively identified consecutive patients who underwent coronary CTA. Cases who underwent both chest CT and invasive coronary angiography (ICA) within 1 year of the coronary CTA were included. The severity of CAC on non-gated chest CT was assessed using a semi-quantitative scoring system and classified into four scales (absent, mild, moderate, severe). The area under the receiver operating characteristic (ROC) curve (AUC) was used to evaluate the diagnostic accuracy of coronary CTA compared to ICA. Subgroups were stratified based on the severity of CAC, and the accuracy of coronary CTA diagnosis in each subgroup was analyzed.
Results:
A total of 337 patients were included. The overall AUC of coronary CTA for diagnosing obstructive CAD was 0.609. In patients with absent or mild CAC, the AUC values were higher than the overall AUC (0.650 and 0.665, respectively). In contrast, among patients with moderate or severe CAC, the AUC decreased to 0.549 and 0.491, respectively. Notably, in the severe CAC subgroup, the AUC fell below 0.5, indicating no diagnostic value. The proportion of obstructive CAD was significantly higher in the severe CAC subgroup compared to the other groups (P=0.004), and the negative predictive value of coronary CTA dropped to 0.
Conclusions:
In patients with severe CAC on non-gated chest CT, coronary CTA is less effective in providing accurate stenosis assessment. However, the cut-off values for semi-quantitative CAC scoring remain to be clearly defined through future studies.
More Related Videos
06:57Author Spotlight: Advancing Cardiovascular Imaging - Introducing the Spatially Weighted Calcium Score for Early Disease Detection
Published on: September 22, 2023
06:16Signal Acquisition, Score Interpretation, and Economics of a Non-Invasive Point-of-Care Test for Coronary Artery Disease
Published on: August 9, 2024
Related Concept Videos
01:25Imaging Studies for Cardiovascular System VI: Calcium -Scoring CT
01:28Imaging Studies for Cardiovascular System V: CT
01:30Acute Coronary Syndrome III: Diagnostic Studies
01:20Imaging Studies for Cardiovascular System III: X-Ray
Definition and Purpose
An X-ray, or radiograph, is a non-invasive method that uses ionizing radiation to take images of internal structures. It is mainly used in cardiac imaging to examine the heart, lungs, and major blood vessels, aiming to identify abnormalities in the heart's size, shape, and position, such as heart failure, congenital defects, and vascular...
01:10Computed Tomography
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
01:27Coronary Artery Disease V: Interprofessional Care