Biomedical Engineering Reference
In-Depth Information
Table 1.
Volumetric Measures of the Outer Compartment
at a Parcellation distances
d
=5
and
d
=7
Normal
Dyslexic
Cases
V
V
o
(
d
1
=5)
V
1
(
d
1
=7)
Cases
V
V
o
(
d
1
=5)
V
1
(
d
1
=7)
1
615.375
469.4941
509.6487
1
540.5625 447.5553
477.312
2
650.8125 516.4356
560.2039
2
546.1875 446.7867
480.8070
3
699.1875 584.0372
638.4656
3
513.5625 419.5890
449.9455
4
626.0625 517.4468
561.6488
4
529.3125 441.1969
470.0294
5
604.1250 510.2974
548.1369
5
567.5625 447.6634
485.4542
6
599.0625 465.5905
505.0028
6
565.8750 453.4378
490.7065
7
665.4375 546.3848
592.2163
7
544.5000 437.8838
472.8335
8
609.7500 470.6741
504.0800
8
563.6250 449.2745
485.8665
9
567.5625 468.6702
507.7015
10
475.8750 382.3809
407.9558
10
546.7500 459.4852
503.2006
10
432.0000 365.0273
383.8285
11
560.2500 494.2015
531.7247
11
585.0000 470.3933
506.0193
12
480.3750 362.6372
390.7261
12
508.5000 409.7843
444.3069
13
637.3125 510.0851
549.2417
13
577.6875 471.4308
506.6007
14 640.1250 477.8618
MEAN 607.2991 489.5215
534.6346 434.0311
(a) Comparison between the volumetric measures of the total white mat-
ter volume to test if there is a significant difference in the volumes
or not; the
t
test has the null hypothesis
µ
w
1
>µ
w
2
(b) Comparison between the volumetric measurement of the outer com-
partment to test that the increment of volume (if proved by the first
test) is resulting from the increment of the outer compartment vol-
ume; the
t
test has the null hypothesis
µ
o
1
>µ
o
2
.
(c) A third
t
test that has a null hypothesis of
µ
i
1
=
µ
i
2
and is performed
to test if the inner compartment played any role in the volumetric
changes found between the different groups.
The results for these hypotheses tests were very promising. The first test
was performed twice, once at a confidence level
α
=0
.
05 and again at a more
restricted tolerance
α
=0
.
01, and both times the null hypothesis was accepted.
The second test, as well, was performed with several combinations. It was done
with the volumetric measures at different distances
d
1
=5and
d
1
=7, as well
