Evaluation of Aortocoronary Graft Patency: A Comparative Study of CT Volume Scanning and Angiography
Computed tomography (CT) has been proven to be an useful method for the evaluation of patency in aortocoronary venous grafts (ACVG). Even though the quantification of graft perfusion is uncertain, and assessment of the supplied coronary arteries is impossible, the detection of graft occlusion in the early postoperative phase is of some interest. Enhancement of ACVG after the injection of contrast material is the criterion of graft patency. CT with a discontinuous rotating tube requires a step-by-step comparison of precontrast and postcontrast scans. Using this approach, the sensitivity and specificity in the evaluation of graft patency are limited due to variations of the volume inspired and exspired by the patient. The mode of continuous acquisition during table movement (spiral CT) provides complete scanning of a selected patient volume during one breath hold. Spiral CT was tested for the evaluation of patency in ACVG in this study.
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