Table 2 Qualitative image quality analysis according to dose level
SDCT | LDCT | ULDCT | p Value for pairwise comparison | |
|---|---|---|---|---|
Overall image quality (Arterial phase) | ||||
R1 | 4.4 ± 0.5 (4–5) (median: 4, IQR, 4–5) | 3.8 ± 0.5 (3–5) (median: 4, IQR, 4–4) | 2.7 ± 0.6 (2–4) (median: 3, IQR, 2–3) | < 0.001+ SD versus LD, < 0.001 SD versus ULD, < 0.001 LD versus ULD, < 0.001 |
R2 | 4.3 ± 0.7 (2–5) (median: 4, IQR, 4–5) | 3.9 ± 0.6 (3–5) (median: 4, IQR, 4–4) | 3.1 ± 0.4 (2–4) (median: 3, IQR, 3–3) | |
Average | 4.4 ± 0.6 (2–5) (median: 4, IQR, 4–5) | 3.9 ± 0.5 (3–5) (median: 4, IQR, 4–4) | 2.9 ± 0.6 (2–4) (median: 3, IQR, 3–3) | |
Overall image quality (Portal phase) | ||||
R1 | 4.5 ± 0.5 (4–5) (median: 4, IQR, 4–5) | 3.9 ± 0.5 (3–5) (median: 4, IQR, 4–4) | 2.8 ± 0.6 (2–4) (median: 3, IQR, 2–3) | < 0.001+ SD versus LD, < 0.001 SD versus ULD, < 0.001 LD versus ULD, < 0.001 |
R2 | 4.9 ± 0.5 (2–5) (median: 5, IQR, 5–5) | 4.6 ± 0.6 (4–5) (median: 5, IQR, 4–5) | 3.5 ± 0.6 (2–5) (median: 3, IQR, 3–4) | |
Average | 4.3 ± 0.7 (2–5) (median: 4, IQR, 4–5) | 4.2 ± 0.6 (3–5) (median: 4, IQR, 4–5) | 3.1 ± 0.7 (2–5) (median: 3, IQR, 2–3) | |