Table 1. Effect of spectral imaging on the metallic artifact and contrast/noise ratio.

Modes of spectral imaging	diameter of stent marker	Contras/noise ratio
Iodine (calcium)	2.54 ± 0.12mm*ƒ	26.35 ± 13.4
Iodine (HAP)	1.62 ± 0.11mm	73 ± 28.02
Iodine (water)	0.33 ± 0.17mmƒ	160.03 ±37.79ƒ
70-keV	1.97 ± 0.12mmƒ	83.65± 20.47
140-keV	1.62 ± 0.09mm	28.13 ±8.38

*Mean ± standard deviation (all such values)

^ƒP < 0.05.