Table 2.
Subjective and objective image quality assessment across five scan duration groups
| Participant | Image quantity | G10min | G2min | G1min | G45s | G30s |
|---|---|---|---|---|---|---|
| Total | 5-point score − 1 | 5 (5,5) | 5 (5,5) | 5 (4,5)* | 4 (4,5)* | 4 (3,4)* |
| 5-point score − 2 | 5 (5,5) | 5 (5,5) | 5 (4,5)* | 4 (4,5)* | 4 (3,4)* | |
| CoV values | 0.19 (0.18,0.21) | 0.20 (0.18,0.22) | 0.21 (0.19,0.23)* | 0.22 (0.20,0.23)* | 0.23 (0.21,0.25)* | |
| Aβ positive | 5-point score − 1 | 5 (5,5) | 5 (5,5) | 5 (4,5)* | 4 (4,5)* | 4 (3,4)* |
| 5-point score − 2 | 5 (5,5) | 5 (5,5) | 5 (4,5)* | 4 (4,5)* | 4 (4,4)* | |
| CoV values | 0.18 (0.17,0.20) | 0.19 (0.18,0.21) | 0.20 (0.19,0.21)* | 0.21 (0.20,0.22)* | 0.22 (0.21,0.23)* | |
| Aβ negative | 5-point score − 1 | 5 (5,5) | 5 (5,5) | 4 (4,5) | 4 (3,4)* | 4 (3,4)* |
| 5-point score − 2 | 5 (5,5) | 5 (5,5) | 4 (4,5) | 4 (4,4)* | 3 (3,4)* | |
| CoV values | 0.23 (0.20,0.26) | 0.25 (0.22,0.27) | 0.26 (0.23,0.28)* | 0.27 (0.23,0.29)* | 0.28 (0.25,0.30)* |
The subjective image quality evaluation, assessed by a 5-point score from two physicians, and the objective image quality evaluation using the coefficient of variation (CoV), were compared between the G15min and other fast scan groups using the Wilcoxon signed-rank test. *: P < 0.05