Table 2: The neurosurgeon’s image
quality parameters scores of low dose- and standard dose head CT protocol.
|
220 (n = 22) |
|||||
|
Image quality category |
p-value |
SDa = LDb |
SD = LD |
SD > LD |
LD > SD |
|
(score 1) |
(score 2) |
(score 1 vs. 2) |
(score 1 vs. 2) |
||
|
visual impression |
1 |
17 (77.3%) |
2 (9.1%) |
1 (4.5%) |
2 (9.1%) |
|
outer CSFc |
1 |
21 (95.5%) |
0 |
1(4.5%) |
0 |
|
GMd/WMe differentiation |
1 |
14 (63.7%) |
3 (13.6%) |
3 (13.6%) |
2 (9.1%) |
|
size of bleeding |
1 |
22 (100%) |
0 |
0 |
0 |
|
ventricles |
1 |
22 (100%) |
0 |
0 |
0 |
|
edema |
1 |
19 (86.4%) |
0 |
2 (9.1%) |
1 (4.5%) |
|
postoperative changes |
1 |
22 (100%) |
0 |
0 |
0 |
|
basal cisterns |
1 |
22 (100%) |
0 |
0 |
0 |
|
240 (n = 31) |
|||||
|
Image quality category |
p-value |
SD = LD |
SD = LD |
SD > LD |
LD > SD |
|
(score 1) |
(score 2) |
(score 1 vs. 2) |
(score 1 vs. 2) |
||
|
visual impression |
1 |
21 (67.8%) |
1 (3.2%) |
5 (16.1%) |
4 (12.9%) |
|
outer CSF |
1 |
29 (93.6%) |
1 (3.2%) |
1 (3.2%) |
0 |
|
GM/WM differentiation |
0.7 |
20 (65%) |
5 (16%) |
4 (12.9%) |
2 (6.5%) |
|
size of bleeding |
1 |
28 (90.4%) |
1 (3.2%) |
1 (3.2%) |
1 (3.2%) |
|
ventricles |
1 |
31 (100%) |
0 |
0 |
0 |
|
edema |
1 |
27 (87.1%) |
0 |
2 (6.5%) |
2 (6.5%) |
|
postoperative changes |
1 |
31 (100%) |
0 |
0 |
0 |
|
basal cisterns |
1 |
31 (100%) |
0 |
0 |
0 |
aSD = standard dose
bLD = low dose
cCSF = cerebrospinal fluid spaces
dGM = gray matter
eWM = white matter
**significance level with p < 0.001 and *p <
0.05