Comparison of automated and manual AIF parameters
Subject | ΔA0 (sec−1) | ΔA1 (sec) | ΔA2 (sec) | d (mm) | Correlation r* | |
---|---|---|---|---|---|---|
Tmax | CBF | |||||
1 | 21.52 | 0.69 | 0.34 | 11.3 | 0.91 | 0.94 |
2 | 17.09 | 1.32 | −0.17 | 15.9 | 0.87 | 0.92 |
3 | 0 | 0 | 0 | 0.9 | 1.00 | 1.00 |
4 | 19.75 | −0.59 | −0.37 | 7.1 | 0.82 | 0.66 |
5 | 47.48 | −2.98 | −1.23 | 11.4 | 0.70 | 0.60 |
6 | 11.39 | 0.32 | −0.88 | 32.2 | 0.82 | 0.72 |
7 | 29.06 | −0.39 | −1.28 | 18.9 | 0.68 | 0.74 |
8 | 37.22 | 0.57 | −0.68 | 18.2 | 0.76 | 0.83 |
9 | 12.83 | 0.12 | 0.76 | 6.0 | 0.75 | 0.72 |
10 | 32.61 | 1.30 | −0.39 | 18.2 | 0.81 | 0.87 |
11 | 25.22 | −0.79 | −0.17 | 30.6 | 0.87 | 0.86 |
12 | −4.32 | −2.65 | −2.15 | 35.9 | 0.81 | 0.82 |
13 | 1.24 | −0.24 | −0.30 | 37.8 | 0.73 | 0.82 |
14 | 27.30 | −2.46 | −0.24 | 24.0 | 0.74 | 0.60 |
15 | 15.26 | −0.19 | −0.07 | 3.0 | 0.85 | 0.88 |
16 | 17.83 | 0.36 | 1.36 | 2.7 | 0.80 | 0.77 |
17 | 2.71 | −5.25 | −2.18 | 35.0 | 0.54 | 0.68 |
18 | 0 | 0 | 0 | 1.3 | 1.00 | 1.00 |
19 | 19.27 | −0.62 | −0.09 | 16.9 | 0.87 | 0.87 |
20 | 11.78 | 0.71 | −0.87 | 44.5 | 0.82 | 0.89 |
21 | 10.17 | −0.19 | −0.30 | 11.6 | 0.85 | 0.87 |
22 | 0 | 0 | 0 | 1.3 | 1.00 | 1.00 |
Mean | 16.16 | −0.50 | −0.41 | 17.5 | 0.82 | 0.82 |
SD | 13.49 | NA | NA | 13.45 | 0.11 | 0.12 |
P value | <0.001 | 0.374 | 0.018 | NA | NA | NA |
Note.—Differences were computed as the automated AIF parameter − manual AIF parameter. A0 = curve height (maximum concentration of contrast agent), A1 = curve center (time to peak), A2 = curve width, d = distance between automated and manual AIF pixels, NA = not applicable.
* Between automated and manual maps.