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European Radiology Experimental
Fig. 2 | European Radiology Experimental

Fig. 2

From: Influence of beam hardening in dual-energy CT imaging: phantom study for iodine mapping, virtual monoenergetic imaging, and virtual non-contrast imaging

Fig. 2

Positions of the regions of interest (ROIs) for measuring computed tomography (CT) values in multi-energy CT phantom image and CT images. a All ROIs lie in the same area, which corresponds to 70% of the regional area. Assuming brain CT imaging, 9 ROIs were set; ROI_1, ROI_3, and ROI_7: Iodine concentration [mg/mL] of 10.00, 2.00, and 5.00 (yellow circles); ROI_2, ROI_5, ROI_6, and ROI_9: Soft tissues as the blood (ρew = 1.07), brain (ρew = 1.02), blood (ρew = 1.10), and water (ρew = 1.00) (blue circles); ROI_4 and ROI_8: Mixture of the iodine and blood (2.00 mg/mL + the blood and 4.00 mg/mL + blood) (green circles). b Single-energy image (80 kVp). c Single-energy image (135 kVp). d Iodine map. e Virtual monoenergetic image, F Virtual non-contrast image

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