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Table 2: 
Comparisons of artifacts limiting arterial evaluation with 256-section and 64-section CTA of the carotids
Shoulder streak artifactsPhoton starvation between shoulders obscures CCA, vertebral artery, IJV in lower neck12140.820
Metallic streak artifactsDental hardware, cardiac defibrillator leads, spinal fusion hardware, etc, obscure adjacent structures22370.004
Contrast material refluxContrast reflux into veins of neck obscures adjacent vertebral artery00N/A
Flow artifactsAltered flow dynamics (eg, slow flow) and rapid scanning time create appearance of dissection flap or nonopacification of patent vessel
    Arterial
    Pseudodissection111.000
    Pseudo-occlusion01N/A
    Differential attenuation510.204
    Venous
    Pseudothrombosis00N/A