Table 4 Median scores of qualitative image analyses
Quality criteria | FBP | QIR-# | QIR-1 | QIR-2 | QIR-3 | QIR-4 |
|---|---|---|---|---|---|---|
Late arterial phase | ||||||
Image noise | 1 (1–1) | 1 (1–1) | 2 (2–2) | 2 (2 –3) | 3 (3–3) | 4 (4–4) |
Image artifacts | 1 (1–2) | 2 (2–2) | 2 (2–2) | 3 (2–3) | 3 (3–3) | 4 (4–4) |
Lesion conspicuity | 0 (0 –0) | 1 (1–1) | 1 (1–2) | 2 (2–2) | 3 (2–3) | 4 (3–4) |
Overall image quality | 1 (1–1) | 1.5 (1 –2) | 2 (2–2) | 2 (2–3) | 3 (3–3) | 4 (3–4) |
Portal venous phase | ||||||
Image noise | 1 (1–1) | 1 (1–2) | 2 (2–2) | 3 (2–3) | 3 (3–4) | 4 (4–4) |
Image artifacts | 1 (1–2) | 2 (2–2) | 2 (2–3) | 3 (2–3) | 3 (3–4) | 4 (4–4) |
Lesion conspicuity | 0 (0–0) | 1 (0–1) | 1 (1–2) | 2 (2–3) | 3 (2–3) | 4 (3–4) |
Overall image quality | 1 (1–1) | 1 (1–2) | 2 (2–2) | 2 (2–3) | 3 (3–3) | 4 (4–4) |
Delayed phase | ||||||
Image noise | 1 (1–1) | 1 (1–1) | 2 (1–2) | 2 (2–3) | 3 (3–3) | 4 (4–4) |
Image artifacts | 1 (1–2) | 2 (1.25–2) | 2 (2–2) | 3 (2–3) | 3 (3–4) | 4 (4–4) |
Lesion conspicuity | 0 (0–0) | 1 (0–1) | 1 (1–2) | 2 (2–2) | 3 (2–3) | 3 (3–4) |
Overall image quality | 1 (1–1) | 1 (1–2) | 2 (2–2) | 2 (2–3) | 3 (3–3.25) | 4 (4–4) |