Table 1: The neuroradiologist’s
image quality parameters scores of low dose- and standard dose head CT
protocols.
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 |
0.0005** |
8 (36.4%) |
2 (9.1%) |
12 (54.5%) |
0 |
outer CSFc |
1 |
22 (100%) |
0 |
0 |
0 |
GMd/WMe
differentiation |
0.0002** |
4 (18.2%) |
5 (22.7%) |
13 (59.1%) |
0 |
size of bleeding |
1 |
22 (100%) |
0 |
0 |
0 |
ventricles |
1 |
22 (100%) |
0 |
0 |
0 |
edema |
0.006* |
7 (31.8%) |
3 (13.6%) |
11 (50%) |
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 |
0.0005** |
15 (48.4%) |
4 (12.9%) |
12 (38.7%) |
0 |
outer CSF |
1 |
30 (96.8%) |
0 |
0 |
1 (3.2%) |
GM/WM differentiation |
0.001* |
12 (38.7%) |
8 (25.8%) |
11 (35.5%) |
0 |
size of bleeding |
1 |
28 (90.4%) |
1 (3.2%) |
1 (3.2%) |
1 (3.2%) |
ventricles |
1 |
30 (96.8%) |
0 |
0 |
1 (3.2%) |
edema |
0.004* |
17 (54.8%) |
5 (16.1%) |
9 (29%) |
0 |
postoperative changes |
0.6 |
27 (87.1%) |
0 |
3 (9.7%) |
1 (3.2%) |
basal cisterns |
0.6 |
27 (87.1%) |
1 (3.2%) |
2 (6.5%) |
1 (3.2%) |
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