CT Coronary Artery (SIEMEN) - CT Động mạch Vành

Computed tomography (CT) produces high-resolution cross-sectional imaging. Injection of contrast agent raises the density in the blood pool well above that of the vessel wall and surrounding tissue. Thus, CT “angiography” (CTA) can be performed. CT angiography of the coronary arteries poses some unique challenges. Given the small lumen of the coronary vessels (typically 1 to 4 mm) and their constant and rapid motion, CT angiography of the coronary artery lumen requires maximal spatial and temporal resolution.
Sufficient temporal resolution was first achieved with electron beam tomography (EBT), with the first successful attempts at angiography of the coronary arteries in the mid 1990s. The recent development of multidetector CT scanners (MDCT) with
Faster imaging speed has allowed improved coronary artery visualization.
This was initially performed with simultaneous acquisition of 4 slices. The technology then advanced to 8, 16, and now up to 64 narrowly collimated slices. This provides high spatial resolution and sufficient temporal resolution to permit adequate and reliable visualization of the coronary artery lumen. Comparison to invasive coronary angiography demonstrates increasing accuracy for stenosis detection. This is expected to bring coronary CTA into the mainstream of cardiology practice.

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