Preoperative Quantitative MR Tractography Compared with Visual Tract Evaluation in Patients with Neuropathologically Confirmed Gliomas Grades II and III: A Prospective Cohort Study
Table 3
Results from tractography, mean diffusivity.
Track
Corticospinal tract
p
Corticospinal tract
p
Corticospinal tract
p
DTI scalars
rMD mean (SD)
rMD mean (SD)
rMD mean (SD)
Segment
Segment 1
Segment 2
Segment 3
Infiltrated tract segment
n = 8
0.98 (0.05)
0.383
n = 8
1.01 (0.04)
0.761
n = 8
1.08 (0.10)
0.009935
Not infiltrated tract segment
n = 26
0.99 (0.04)
n = 26
1.01 (0.04)
n = 26
1.00 (0.04)
Track
Inferior frontooccipital fasciculus
p
Inferior frontooccipital fasciculus
p
Inferior frontooccipital fasciculus
p
DTI scalars
rMD mean (SD)
rMD mean (SD)
rMD mean (SD)
Segment
Segment 1
Segment 2
Segment 3
Infiltrated tract segment
n = 14
1.19 (0.21)
0.000122
n = 15
1.20 (0.26)
0.009287
n = 14
1.07 (0.09)
0.018801
Not infiltrated tract segment
n = 19
1.00 (0.02)
n = 19
1.01 (0.04)
n = 19
0.99 (0.06)
Track
Cingulum
p
Cingulum
p
DTI scalars
rMD mean (SD)
rMD mean (SD)
Segment
Segment 1
Segment 2
Infiltrated tract segment
n = 4
1.19 (0.15)
0.002116
n = 4
1.47 (0.55)
0.001471
Not infiltrated tract segment
n = 30
1.03 (0.04)
n = 30
1.01 (0.04)
Track
Parahippocampal cg
p
Parahippocampal cg
p
DTI scalars
rMD mean (SD)
rMD mean (SD)
Segment
Segment 1
Segment 2
Infiltrated tract segment
n = 5
1.44 (0.34)
0.001574
n = 5
1.37 (0.25)
0.000793
Not infiltrated tract segment
n = 29
1.03 (0.10)
n = 29
1.01 (0.08)
Track
Arcuate fasciculus
p
Arcuate fasciculus
p
DTI scalars
rMD mean (SD)
rMD mean (SD)
Segment
Segment 1
Segment 2
Infiltrated tract segment
n = 12
1.34 (0.28)
0.000166
n = 10
1.22 (0.21)
0.001226
Not infiltrated tract segment
n = 22
1.00 (0.04)
n = 21
1.01 (0.04)
Track
Inferior longitudinal fasciculus
p
Inferior longitudinal fasciculus
p
DTI scalars
rMD mean (SD)
rMD mean (SD)
Segment
Segment 1
Segment 2
Infiltrated tract segment
n = 8
1.19 (0.15)
0.000602
n = 8
1.11 (0.11)
0.002844
Not infiltrated tract segment
n = 26
1.01 (0.04)
n = 26
1.00 (0.06)
Track
Uncinate fasciculus
p
Uncinate fasciculus
p
DTI scalars
rMD mean (SD)
rMD mean (SD)
Segment
Segment 1
Segment 2
Infiltrated tract segment
n = 12
1.18 (0.15)
0.000146
n = 12
1.24 (0.27)
0.15
Not infiltrated tract segment
n = 21
1.01 (0.03)
n = 21
1.01 (0.04)
Track
Fornix
p
Fornix
p
DTI scalars
rMD mean (SD)
rMD mean (SD)
Segment
1, midline
Segment 2
Infiltrated tract segment
NA
NA
NA
n = 2
1.09 (0.02)
0.371
Not infiltrated tract segment
NA
NA
NA
n = 30
1.03 (0.19)
Track
Callosal body minor forceps
p
DTI scalars
rMD mean (SD)
Segment
Segment 1
Infiltrated tract segment
n = 9
1.13 (0.08)
0.000209
Not infiltrated tract segment
n = 25
1.01 (0.02)
No ratio due to tract segment in midline. rMD in infiltrated and not infiltrated tract segment presented as mean and standard deviation with results from Mann-Whitney tests. was regarded as statistically significant. rMD = relative mean diffusivity (ipsilateral mean diffusivity/contralateral mean diffusivity), SD = standard deviation, cg = cingulum, and NA = not available.