Table 1. Summary of the mean attenuation values (Hounsfield unit; HU) and signal-to-noise ratio (SNR) values measured in each structure with every contrast media solution (p<0.05).

		Iodixanol	Iomeprol			Iodixanol	Iomeprol
Structure	Solution	Mean HU±SD	Mean HU±SD	Δ	p-value	SNR±SD	SNR±SD	Δ	p-value
Lumen	Low	124.3±48.8	152.3±41.9	−28	<0.05	69.1±27.1	84.6±23.3	−15.5	<0.05
	Medium	183±53.7	197.7±53.4	−14.7	0.106	101.7±29.8	109.8±29.7	−8.1	0.106
	High	204.5±55.4	231.5±66.4	−27	<0.05	113.6±30.8	121.9±35	−8.3	0.139
	Very high	332.2±91.5	436.6±117.4	−104.4	<0.05	166.1±45.8	189.8±51.1	−23.7	<0.05
Non-calcified plaque	Low	34.3±22.1	47.8±27.3	−13.5	<0.05	19.1±12.3	26.5±15.2	−7.4	<0.05
	Medium	56.3±27	56.5±37.2	−0.2	0.980	31.3±15	31.4±20.7	−0.1	0.980
	High	70.9±31.6	71.1±41.9	−0.2	0.981	39.4±17.5	37.4±22.1	+2	0.710
	Very high	112.5±43.2	121.5±59	−9	0.511	56.3±21.6	52.8±25.7	+3.5	0.582
Calcified plaque	Low	542.1±244.5	516.4±281.6	+25.7	0.697	301.2±135.8	286.9±156.4	+14.3	0.697
	Medium	549.4±241	537.8±238.6	+11.6	0.847	305.2±133.9	298.8±132.6	+6.4	0.847
	High	583±249.8	556.7±234.6	+26.3	0.665	323.9±138.8	293±123.5	+30.9	0.350
	Very high	662.7±247.3	694.6±231.7	−31.9	0.596	331.4±123.6	302±100.8	+29.4	0.301
Surrounding	Low	−120±8.8	−117.8±5.6	−2.2	0.076	−66.7±4.9	−65.4±3.1	−1.3	0.076
	Medium	−119.7±4.9	−117±6.7	−2.7	<0.05	−66.5±2.7	−65±3.7	−1.5	<0.05
	High	−120.6±6.2	−117.7±5.8	−2.9	<0.05	−67±3.5	−61.9±3	−5.1	<0.05
	Very high	−120.1±8.5	−116.5±5.6	−3.6	<0.05	−60.1±4.2	−50.7±2.4	−9.4	<0.05

SD, standard deviation.