Table 4.
Attenuation Values and Signal-to-Noise Ratio
| SD-IR | LD-IR | LD-DLIR | p-value | |
|---|---|---|---|---|
| Attenuation value | ||||
| Liver (ICC) | 0.85 | 0.92 | 0.94 | N.A. |
| Reader 1 | 120.9 ± 11.6 (97.7–149.1) | 119.3 ± 9.9 (74.8–136.4) | 119.6 ± 9.8 (75.8–137.1) | 0.66 |
| Reader 2 | 120.9 ± 12.7 (95.5–158.4) | 120.3 ± 10.7 (74.3–142.3) | 120.4 ± 10.5 (73.9–140.6) | 0.96 |
| Pancreas (ICC) | 0.71 | 0.87 | 0.85 | N.A. |
| Reader 1 | 104.2 ± 11.3 (78.9–129.7) | 105.6 ± 12.2 (80.3–131.8) | 106.0 ± 12.3 (79.3–134.8) | 0.72 |
| Reader 2 | 102.5 ± 14.3 (64.7–134.2) | 102.3 ± 14.0 (67.2–127.3) | 103.5 ± 13.2 (70.6–128.8) | 0.88 |
| Spleen (ICC) | 0.90 | 0.89 | 0.66 | N.A. |
| Reader 1 | 133.5 ± 14.2 (101.5–162.6) | 130.7 ± 11.1 (109.1–160.0) | 130.0 ± 10.8 (103.1–156.0) | 0.28 |
| Reader 2 | 134.0 ± 12.3 (109.1–163.5) | 131.0 ± 10.6 (111.9–162.4) | 131.3 ± 10.6 (113.4–162.8) | 0.32 |
| Abdominal aorta (ICC) | 0.91 | 0.96 | 0.98 | N.A. |
| Reader 1 | 161.1 ± 19.3 (122.5–198.8) | 159.8 ± 17.1 (115.0–202.5) | 161.5 ± 17.5 (114.9–206.1) | 0.87 |
| Reader 2 | 163.4 ± 21.4 (123.8–214.6) | 160.8 ± 18.4 (112.6–206.8) | 161.9 ± 18.3 (112.9–207.8) | 0.76 |
| Portal vein (ICC) | 0.87 | 0.90 | 0.94 | N.A. |
| Reader 1 | 175.8 ± 19.4 (136.2–212.3) | 175.6 ± 16.8 (141.6–220.2) | 178.7 ± 17.2 (142.5–224.2) | 0.57 |
| Reader 2 | 178.8 ± 23.3 (122.4–244.4) | 173.9 ± 18.0 (137.3–214.7) | 177.7 ± 18.4 (137.6–218.4) | 0.39 |
| Background noise (ICC) | 0.41 | 0.28 | 0.31 | N.A. |
| Reader 1 | 7.5 ± 1.7 (4.2–12.9) | 11.0 ± 1.7a (6.7–15.4) | 6.5 ± 1.8b (4.1–13.7) | <0.001 |
| Reader 2 | 8.3 ± 1.9 (5.1–12.6) | 11.7 ± 1.4a (8.4–15.2) | 7.5 ± 2.1b (4.5–14.6) | <0.001 |
| SNR | ||||
| Liver (ICC) | 0.55 | 0.35 | 0.39 | N.A |
| Reader 1 | 16.9 ± 3.7 (9.9–26.5) | 11.1 ± 1.8c (7.9–17.7) | 19.5 ± 4.0d (9.4–29.3) | <0.001 |
| Reader 2 | 15.6 ± 4.5 (8.4–26.7) | 10.5 ± 1.4c (6.9–13.9) | 17.3 ± 4.5d (8.3–26.5) | <0.001 |
| Pancreas (ICC) | 0.47 | 0.31 | 0.52 | N.A. |
| Reader 1 | 14.5 ± 3.4 (7.6–27.3) | 9.8 ± 1.7c (6.3–15.5) | 17.1 ± 3.7d (6.9–23.7) | <0.001 |
| Reader 2 | 13.2 ± 3.5 (7.7–23.7) | 8.9 ± 1.4c (5.3–11.7) | 14.8 ± 4.0d (7.1–22.0) | <0.001 |
| Spleen (ICC) | 0.55 | 0.42 | 0.50 | N.A. |
| Reader 1 | 18.9 ± 4.7 (9.7–38.4) | 12.2 ± 1.9c (8.0–17.6) | 21.4 ± 5.0d (8.8–35.1) | <0.001 |
| Reader 2 | 17.3 ± 5.1 (8.7–29.1) | 11.4 ± 1.7c (7.7–17.0) | 18.9 ± 5.2 (8.0–29.2) | <0.001 |
N.A., not applicable. ICC, intraclass correlation coefficient.LD-DLIR, low-dose with deep learning image reconstruction; LD-IR, low-dose with adaptive statistical iteration reconstruction Veo.SD-IR, standard-dose with hybrid-iterative reconstruction technique.SNR, signal-to-noise ratio..
Data are means ± 1 standard deviation.
a
Value was significantly greater (p < 0.017) than those with SD-IR and LD-DLIR.
b
Value was significantly lower (p < 0.017) than those with SD-IR.
c
Value was significantly lower (p < 0.017) than those with SD-IR and LD-DLIR.
d
Value was significantly greater (p < 0.017) than those with SD-IR.