Table 3 Quantitative analyses of image noise and vascular and HCC Lesion Contrast-to-Noise Ratios (CNRs)

Late arterial

 Noise (HU)

29 (27–31)

22 (20–24)

19 (17–21)

16 (14–18)

27 (25–30)

24 (22–26)

21 (19–23)

18 (17–20)

15 (14–17)

31 (29–32)

24 (23–25)

20 (20–22)

17 (16–19)

14 (13–16)

 CNR_vascular

11 (6–18)

14 (8–23)

17 (10–26)

19 (11–32)

12 (6–20)

14 (7–23)

17 (9–26)

19 (12–29)

24 (13–38)

9 (6–16)

13 (8–20)

15 (9–23)

15 (10–26)

22 (12–33)

 CNR_HCC

2.8 (1.6–3.8)

3.4 (2.1–4.5)

4.1 (2.6–5.1)

4.5 (3.0–6.2)

3.0 (1.8–4.0)

3.3 (2.0–4.5)

3.6 (2.3–4.9)

4.4 (2.7–5.5)

5.1 (3.2–6.8)

2.1 (1.3–3.2)

2.7 (1.8–4.0)

3.0 (2.0–4.6)

3.6 (2.8–5.5)

4.3 (2.8–6.5)

Portal venous

 Noise (HU)

29 (27–31)

22 (21–24)

19 (18–21)

16 (15–18)

28 (26–30)

25 (23–27)

22 (20–24)

19 (17–20)

16 (14–18)

29 (27–32)

23 (21–25)

20 (18–22)

16 (15–19)

14 (13–16)

 CNR_vascular

7 (5–8)

8 (6–10)

10 (7–12)

11 (8–14)

7 (5–9)

8 (6–10)

9 (7–11)

11 (8–13)

13 (10–16)

6 (4–7)

7 (6–9)

8 (7–11)

9 (8–12)

11 (9–15)

 CNR_HCC

1.4 (0.7–2.9)

1.6 (0.8–3.6)

1.9 (1.0–4.2)

2.2 (1.0–4.9)

1.6 (0.9–2.9)

1.8 (0.9–3.2)

2.1 (1.1–3.6)

2.5 (1.3–4.2)

2.9 (1.5–5.0)

0.9 (0.5–2.6)

1.1 (0.6–3.3)

1.3 (0–7–3.8)

1.5 (0.8–4.4)

1.8 (1.0–5.1)

Delayed

 Noise (HU)

28 (27–31)

22 (21–24)

19 (18–21)

16 (15–17)

29 (26–30)

25 (23–27)

22 (20–24)

19 (18–20)

16 (14–17)

29 (27–33)

23 (21–26)

20 (18–22)

16 (16–19)

13 (13–16)

 CNR_vascular

2.2 (1.7–3.0)

2.7 (2.1–3.8)

3.2 (2.3–4.4)

3.6 (2.8–5.2)

2.3 (1.8–3.0)

2.6 (2.0–3.3)

2.9 (2.3–3.8)

3.4 (2.5–4.4)

4.1 (3.0–5.2)

2.1 (1.5–3.0)

2.7 (1.8–3.9)

3.1 (2.1–4.2)

3.6 (2.5–5.0)

4.2 (3.0–6.0)

 CNR_HCC

0.7 (0.3–1.3)

0.9 (0.4–1.6)

1.0 (0.4–1.8)

1.2 (0.5–2.1)

1.0 (0.4–1.4)

1.1 (0.4–1.6)

1.2 (0.5–1.8)

1.3 (0.6–2.1)

1.6 (0.6–2.4)

0.5 (0.2–1.2)

0.6 (0.2–1.4)

0.7 (0.3–1.6)

0.8 (0.3–1.8)

0.9 (0.4–2.1)