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Figure 1a. Test bolus method. (a) Axial image shows the right internal carotid artery (ICA) (1), left ICA (2), and left internal jugular vein (3). (b) Diagram shows the enhancement curves for the right ICA (1), left ICA (2), and left internal jugular vein (3) after injection of 10 mL of contrast material and a saline solution bolus. The individual start delay can be set between the arterial peak and the venous upslope. ROI = region of interest.
