Evaluation of Coronary Artery Stenosis by Means of Multi-Detector Row Computed Tomography

Multi-detector computed tomography (MDCT) with retrospectively ECG-gated image reconstruction permits coronary artery visualization. The rapid scan time contributes to a high level of patient satisfaction, which facilitates consistent breath-hold even in very ill patients. The fine anatomical structure is visualized by increasing spatial resolution but decreasing slice thickness. The voxel approaches the same size in all three dimensions, which enables high quality 3D image reconstruction. The authors used a 16-slice, with improved spatial, temporal resolution, CT scanner and give β-blocker medication to the patients to lower the heart rate. This helps in the detection of stenosis and occlusions of coronary artery. A total of 235 patients were examined by MDCT within six months. The outcome showed 108 patients with one or more coronary artery stenosis or occlusion. Cardiac MDCT produces images with better signal-to-noise ratio at a thinner slice thickness. Artifacts caused by cardiac motion are the most common problems and may seriously degrade visualization of small anatomic structures. It is tackled by improving temporal resolution or by decreasing the movement of heart. MDCT with retrospective ECG gating permits the detection of coronary artery stenosis with high accuracy, non-invasive and faster means. The examination of cardiac MDCT needs only few minutes, and provides invaluable images for advanced stent implant to treat the stenosis.