Table 1 Method of tracking the white matter fiber tracts
From: Surgical planning in patients with brain glioma using diffusion tensor MR imaging and tractography
Tract | Method of tracking |
|---|---|
Corticospinal tract | Three ROIs were placed on transverse color-coded diffusion tensor images: in the pons anteriorly, in the posterior limb of internal capsule and at the motor cortex (precentral gyrus) |
Superior longitudinal fasciculus | Two ROIs were placed in the cerebral deep WM on a coronal directional color-coded map: an anterior ROI in the plane passing through the reconstructed corticospinal tract and a posterior ROI in the plane passing through rostral surface of the splenium of the corpus callosum |
Inferior longitudinal fasciculus | Two ROIs: the first was at the parieto-occipital sulcus (which was identified at the middle of the coronal section along the superior inferior axis) and the second was on a coronal section at the mid-temporal lobe at the section level of the posterior tip of the putamen |
Corpus callosum | The primary ROI was placed in the corpus callosum in the mid sagittal plane. Secondary ROIs were placed, with two ROIs on the coronal color-coded map and two ROIs on the transverse color-coded map. Anterior callosal fibers were reconstructed by placing the ROI covering the deep WM in the coronal plane anterior to the genu of the corpus callosum. The posterior callosal fibers were reconstructed by placing the ROI posterior to the splenium of the corpus callosum. Callosal body fibers were reconstructed by placing the ROI at the centrum semiovale in the transverse plane superior to the body of the corpus callosum. The temporal interhemispheric connection fibers were reconstructed by placing ROIs bilaterally in the temporal deep WM, lateral to the trigone of the lateral ventricles. These four fibers were combined to delineate the entire corpus callosum. |
Uncinate fasciculus | The seed area in the WM of the frontal lobe was located on the coronal planes at the tip of the frontal horn of the lateral ventricle, and the target area in white matter was located on the coronal planes at the tip of the inferior horn of the lateral ventricle in the ipsilateral temporal tip |