Table 3. Comparison of general data and objective image quality of patients between Group 1 (routine-dose FBP reconstruction) and Group 2 (120 KV+84 mAs/IRT L5 reconstruction).

Item	Group 1	Group 2	t	P
Age (year)	54±18 (34–75)	52±10 (28–77)	−0.58	0.56
Sex (male/female )	15/6	20/16	2.97†	0.09†
Body mass index	25.40±2.06	25.45±2.15	−1.28	0.2
	(22.83–28.68)	(23.16–29.10)
Heart rate	62±6 (47–69)	59±6 (49–69)	−1.16	0.25
Heart rate viability	1.72±1.15 (0–5)	1.16±1.07 (0–5)	−1.88	0.07
Scan length	12.92±1.62	12.76±1.20	−0.44	0.66
	(10.92–16.35)	(10.96–18.78)
CTaorta	421.30±43.63	444.46±50.85	−1.75	0.09
	(354.4–558.1)	(352.7–540.1)
CTfat	−99.21±18.84	−91.97±17.92	1.44	0.16
	(−74.5–−151.3)	(−59.0–−124.3)
Image noise	35.49±9.44	36.54±10.70	0.37	0.71
	(24.0–59.1)	(19.1–69.4)
SNR	12.43±2.54	13.63±4.93	1.03	0.31
	(7.1–16.5)	(5.8–30.7)
CNR	15.39±3.22	16.28±5.41	0.68	0.50
	(8.7–20.1)	(7.0–35.1)

Note: ^†indicates the results of x ². SNR: Signal-to-noise ratio, CNR: contrast-to-noise ratio.