Figure 3.

Low-energy threshold photon-counting CT images acquired at five kV levels (left) and VMIs at 40, 50, 70, 100, and 140 keV (right) generated from the small phantom; iodine at 20 mg/mL (top), DBCM at 12% (bottom), and water (middle) are cropped and displayed for visual comparison. Note that the CT numbers for iodine contrast media vary substantially across tube potentials and VMI energy levels, compared to little change in CT number for water and DBCM. Some of the DBCM vials contain an air-DBCM fluid level.