Coronary CTA
Noninvasive coronary artery CT angiography for visualizing coronary artery stenosis and plaque.
What is Coronary?
Coronary CTA is a specialized CT examination that uses intravenous iodinated contrast to visualize the coronary arteries in detail. The scan is synchronized with the patient's ECG to minimize motion artifacts from the beating heart.
How it works: During the scan, contrast dye is injected through an IV line. The CT scanner then takes multiple X-ray images synchronized with your heartbeat (ECG gating). A computer reconstructs these images into 3D views of your coronary arteries with high spatial resolution.
Common Uses of Coronary
Chest pain evaluation
Evaluate patients with low to intermediate risk of coronary artery disease presenting with chest pain, as an alternative to invasive cardiac catheterization.
Coronary artery stenosis assessment
Detect and quantify coronary artery stenosis, identify high-risk plaque features, and assess plaque burden.
Post-stent or post-CABG follow-up
Evaluate stent patency and bypass graft patency after coronary revascularization procedures.
Congenital coronary anomalies
Identify congenital coronary artery anomalies such as origin from wrong sinus, courses between great vessels, or fistulas.
Risk stratification in asymptomatic patients
Assess coronary plaque burden and characteristics in high-risk asymptomatic patients for preventive strategies.
Advantages
- ✓Non-invasive alternative to cardiac catheterization
- ✓High negative predictive value (>99%) - effectively rules out significant CAD
- ✓Fast procedure (10-15 minutes)
- ✓Can characterize plaque composition (calcified vs soft plaque)
- ✓Simultaneously assess other chest structures (lungs, aorta, pulmonary arteries)
Limitations
- ⚠Requires stable heart rate (typically <60-65 bpm) for optimal image quality
- ⚠Heavy calcification can limit stent evaluation (blooming artifact)
- ⚠Contrast dye required (not suitable for kidney disease or contrast allergy)
- ⚠Radiation exposure (though modern protocols reduce dose significantly)
- ⚠Limited value in patients with high calcium scores (Agatston >400)
Preparation Checklist
0 of 10 completed
⚖️Coronary vs CT
Related Imaging Modalities
Combine with CT/MRI/US for complementary detail. Invasive angiography remains gold standard for intervention when stenting is planned.
CT
CT scans use X-rays to create detailed cross-sectional images of the body. They are particularly useful for detecting bone fractures, tumors, and internal bleeding.
MRI
MRI uses powerful magnets and radio waves to produce detailed images of organs and soft tissues. Excellent for brain, spine, and joint imaging.
Ultrasound
Ultrasound uses sound waves to create real-time images. Commonly used for pregnancy monitoring and examining organs like the heart, liver, and kidneys.
Digital
Catheter-based iodinated contrast angiography for vessels.
Browse Coronary Terms
Explore common terms in Coronary reports, each with detailed explanations, clinical significance, and related lab tests to help you understand your imaging results. lab tests.
Coronary Artery Aneurysm on CTA: What It Shows, Cost & Prepa
Focal dilation of coronary artery >1.5x normal vessel diameter; may contain thrombus or show calcification
Coronary Artery Disease (CAD) on CTA: What It Shows, Cost &
Coronary artery luminal narrowing with plaque; assessed for severity, composition, and hemodynamic significance
Coronary Artery Stenosis on CTA: What It Shows, Cost & Prepa
Luminal narrowing of coronary arteries visualized as reduced contrast opacification; graded by percentage diameter reduction
Coronary Plaque Characterization on CTA: What It Shows, Cost
Plaque visualized as wall thickening with varying attenuation: calcified (bright >130 HU), non-calcified (soft 30-60 HU), low-attenuation (<30 HU), or mixed composition
Coronary Bypass Graft Patency on CTA: What It Shows, Cost &
Patent grafts show complete contrast opacification from origin to anastomosis; occluded grafts show absence of contrast filling, often with soft tissue density replacing the graft lumen
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