Radiology Research and Practice

Research Article

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)	0.383	n = 26	1.01 (0.04)	0.761	n = 26	1.00 (0.04)	0.009935

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)	0.000122	n = 19	1.01 (0.04)	0.009287	n = 19	0.99 (0.06)	0.018801

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)	0.002116	n = 30	1.01 (0.04)	0.001471

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)	0.001574	n = 29	1.01 (0.08)	0.000793

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)	0.000166	n = 21	1.01 (0.04)	0.001226

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)	0.000602	n = 26	1.00 (0.06)	0.002844

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)	0.000146	n = 21	1.01 (0.04)	0.15

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)	0.371

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)	0.000209

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.