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The average peak enhancement for gray matter, white matter, artery, and vein in different concentration groups
300 mg/mL (HU) 350 mg/mL (HU) 400 mg/mL (HU)
Gray matter 9.8 ± 0.3 10.6 ± 0.2 12.3 ± 0.4
White matter 4.2 ± 0.1 4.5 ± 0.1 5.0 ± 0.2
Artery 239.8 ± 12.9 273 ± 7.8 313.2 ± 13.2
Vein 375.3 ± 9.4 384.9 ± 7.4 421.9 ± 14.4

	300 mg/mL (HU)	350 mg/mL (HU)	400 mg/mL (HU)
Gray matter	9.8 ± 0.3	10.6 ± 0.2	12.3 ± 0.4
White matter	4.2 ± 0.1	4.5 ± 0.1	5.0 ± 0.2
Artery	239.8 ± 12.9	273 ± 7.8	313.2 ± 13.2
Vein	375.3 ± 9.4	384.9 ± 7.4	421.9 ± 14.4