Severe artifacts, determining uncertainty of diagnosis in some areas ![]() Low artifacts, not invalidating the diagnosis The images were then analysed by two trained radiologist, who scored the total quality basing on the following score: Technical parameters: 64x0.625 collimation, pitch 0.24, rotation time 350 msec ≈700 mA, 80-120 kV,Ĭontrast agent: Iohexol, Omipaque® 350, Nycomed USA. The CT scanner: 64-MDCT VCT-XT, Healthcare GE, Milwaukee. In some cases also patients with high basal HR underwent PULSE protocol for the physiological bradycardia during apnoea. We applied the low dose protocol whenever possible when tachyarrhythmia we opted for the spiral technique, less influenced by a high heart rate. The cut-off was based on basal heart rate as in the table below: Between January and July 2009 we examinated 186 consecutive patients, 164 with axial prospectively gated technique, or SnapShot Pulse, and 22 with retrospectively gated spiral technique.
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