Comparison of Contrast Agents During CT Angiography | 合法藥品大搜索

Theinvestigatorswillevaluatewhetheriodixanol320(Visipaque®),...andcontrastenhancementcomparedtobothVisipaque320andOmnipaqueandIsovue.

CTA infusion is administered using a 5 ml/sec IV iodinated contrast infusion. 50-70 ml of iodinated contrast is used for the scan depending on the patients body habitus. The total contrast dose must not exceed 70 ml. An automated bolus tracking feature (SmartPrep, GE Healthcare, Milwaukee, USA) is used to judge contrast bolus arrival and optimize image quality. Patients will be asked to hold their breaths during scanning for up to 10 seconds. A Field of View (FOV) of 25 cm is adjusted to include the heart from below the carina to just below diaphragm. The aorta will be included in the FOV to exclude aortic pathology (ie. dissection, aneurysm, etc.). For patients in sinus rhythm, prospective ECG gating centered at 75% of the R-R interval is used while those in Atrial fibrillation or HR >65 despite oral and IV medications, a retrospective gating is used. The following parameters are used Tube voltage = 100-120kV (b...