Table 2. Quantitative assessment of image quality based on stents location.

Stent location	DECTA protocols	CT attenuation	Image noise	SNR	CNR
1 CIA
DECTA [19]	65	462.20±101.62	42.10±17.72	12.88±8.53	20.44±16.80
	68	420.50±90.43	38.45±16.17	12.93±9.11	19.37 ±13.40
	70	397.50±87.52	38.51±15.47	11.65±7.62	17.65±10.67
	72	374.50±82.84	38.59±15.54	10.93±7.35	15.72±8.81
Conventional CTA [14]		428.70±92.17	48.46±23.70	11.11±5.60	9.62±4.92
2 EIA
DECTA [3]	65	562.70±36.50	32.78±13.20	18.40±8.49	20.20±2.14
	68	508.80±33.10	31.52±13.27	17.42±8.28	19.61±3.33
	70	476.40±31.20	31.34±13.59	16.47±8.01	18.38±4.03
	72	446.20±29.42	31.53±14.04	15.33±7.49	16.82±4.55
Conventional CTA [2]		637.00±447.72	61.52±39.67	10.12±0.75	8.93±1.43
3 SFA
DECTA [7]	65	320.80±199.60	48.19±23.42	8.83±9.65	18.87±19.06
	68	288.90±181.78	45.25±21.04	8.46±9.44	17.63±17.81
	70	269.70±171.10	43.95±19.55	8.04±9.05	16.14±16.23
	72	251.70±161.14	42.97±18.26	8.90±8.88	14.57±14.88
Conventional CTA [6]		427.10±147.84	63.69 ±17.84	7.52±3.78	6.42±3.58

CT number in Hounsfield units; SNR, signal-to-noise ratio in the stented area; CNR, contrast-to-noise ratio. Image process: comparison between 4 keVs and conventional CTA. CIA, common iliac artery; EIA, external iliac artery; SFA, superficial femoral artery.