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Administration of low volume of contrast in a patient imaged for evaluation prior to percutaneous aortic valvular implantation. Conventional polyenergetic CT image (a) in a patient after injection of 20 mL of iodinated contrast shows suboptimal blood pool enhancement. Virtual 40 keV monoenergetic image (b) generated from the same data set at the same level shows significant boosting of contrast within the vessels.
