Article Figures & Data
Figures
- Fig 1.
Tractographies of the uncinate fasciculus were drawn by using diffusion-weighted images (EPI sequence: TR = 2300 ms, TE = 122 ms, b = 1000 s/mm2, 6-axis encoding). A and B, Tractographies, coronal (A) and near sagittal (B) views, of the uncinate fasciculus are obtained with the seed area (blue) on the coronal plane to include the white matter of the substantia innominata and the external capsule just cranial to the middle cerebral artery (arrow, note the flow void) and with the target area (pink) on coronal planes in the white matter of the temporal lobe just caudal to the middle cerebral artery (arrow).
- Fig 2.
Tractographies of uncinate fasciculus with 4 different FA thresholds. FA thresholds were set at 0.1, 0.15, 0.2, and 0.25. There is a tendency for lower thresholds to reveal a larger number of tract lines and higher thresholds to reveal fewer tract lines and concentrated tracts.
- Fig 3.
The correlations between the MMSE score and the mean FA value (A) and mean ADC value (B) of the uncinate fasciculus with their linear regression lines are shown. Tractographies of the uncinate fasciculus are drawn under 4 different FA thresholds (0.10, 0.15, 0.20, and 0.25). A higher FA threshold results in a lower mean ADC value and a higher mean FA value along the uncinate fasciculus. For mean FA values, the Rs are 0.59 for an FA threshold of 0.25, 0.73 for a threshold of 0.20, 0.68 for a threshold of 0.15, and 0.56 for a threshold of 0.10. For mean ADC values, Rs are −0.58 for an FA threshold of 0.25, −0.70 for a threshold of 0.20, −0.71 for a threshold of 0.15, and −0.66 for a threshold of 0.10. An FA a threshold of 0.20 shows higher correlation between mean FA values and the MMSE score, whereas FA thresholds of 0.15 and 0.2 show a higher correlation between mean ADC and MMSE scores.
- Fig 4.
On the tract construction of the uncinate fasciculus, a lower threshold results in a larger number of tract lines and a higher threshold results in a smaller number and concentrated tracts. Ellipsoid displays of diffusion tensor parameters on the axial plane near the temporal stem with different FA thresholds (0.25 and 0.10) are shown. The size of the ellipsoid represents the ADC value, and the shape of the ellipsoids represents the anisotropy. The color represents the direction of the eigenvector. The ellipsoids near the center of the uncinate fasciculus tend to have a smaller diffusivity and larger anisotropy.
