Role of Extracranial Carotid Duplex and Computed Tomography Perfusion Scanning in Evaluating Perfusion Status of Pericarotid Stenting
Table 4
CT perfusion parameters before and after stenting.
Time
Before treatment
After treatment
Change status (number)
Mean
SD
Median
Min
Max
Mean
SD
Median
Min
Max
Decrease
Increase
The same
value
MTT ratio
13
1.33
0.50
1.19
1.04
1.76
0.44
2.27
13
1.10
0.40
1.01
0.80
1.35
0.65
2.06
11
2
0
0.013
dMTT
13
2.43
2.37
1.64
0.56
3.53
0.03
7.30
13
1.59
1.92
0.74
0.35
2.30
0.03
6.85
9
3
1
0.182
MTT index
13
0.44
0.41
0.29
0.12
0.76
0.01
1.27
13
0.29
0.29
0.23
0.09
0.41
0.01
1.06
11
2
0
0.039
CBV ratio
15
1.11
0.36
1.04
0.92
1.28
0.50
1.99
15
1.01
0.20
0.98
0.86
1.14
0.64
1.42
9
6
0
0.394
dCBV
15
0.72
0.77
0.41
0.18
0.97
0.12
2.89
15
0.39
0.29
0.35
0.19
0.45
0.03
0.95
9
6
0
0.191
CBV index
15
0.26
0.26
0.14
0.06
0.49
0.04
0.99
15
0.15
0.12
0.14
0.08
0.20
0.01
0.42
9
6
0
0.334
CBF ratio
15
1.13
0.76
0.89
0.72
1.47
0.32
3.53
15
0.97
0.27
0.96
0.83
1.11
0.58
1.68
8
7
0
0.910
dCBF
15
13.91
15.00
8.54
5.69
18.19
1.26
52.41
15
9.13
11.97
5.10
2.69
6.94
1.32
44.94
10
5
0
0.100
CBF index
15
0.44
0.62
0.28
0.11
0.51
0.02
2.53
15
0.20
0.18
0.13
0.05
0.34
0.03
0.68
9
6
0
0.156
TTP ratio
15
1.08
0.18
1.01
0.97
1.32
0.79
1.37
15
0.96
0.14
0.92
0.86
1.04
0.78
1.26
12
3
0
0.017
dTTP
15
2.10
2.19
0.96
0.29
3.39
0.17
7.02
15
1.62
1.12
1.50
0.54
2.53
0.17
3.90
8
7
0
0.532
TTP Index
15
0.14
0.14
0.09
0.02
0.32
0.01
0.37
15
0.12
0.08
0.12
0.06
0.21
0.01
0.26
6
9
0
0.910
Note. SD, standard deviation; dMTT, difference of mean transit time; dCBV, difference of cerebral blood volume; dCBF, difference of cerebral blood flow; dTTP, difference of time to peak. : percentile 25; : percentile 75. value by Wilcoxon signed ranks test.
