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Coronary CT angiography injection protocol of a dual-head power injector (A, iodine contrast medium; B, saline). The protocol displays injection rate, volume (upper part), and flow rate over time (lower rate). Protocol started with a saline bolus to test venous access [1]. Second was an undiluted CM test bolus [3] followed by saline flush [4]. Finally, triphasic injection protocol contained undiluted CM bolus [6], followed by 21% diluted CM bolus [7] and saline chaser [8].
