Written 7/25/08 by Aimee Zisner. Updated 02/17/2009 by Owen Phillips. Email if you have any questions. This protocol explains how to identify the inferior fronto-occipital fasciculus (IFO) in DTIStudio. For more information on identifying white matter tracts using DTIStudio, see http://www.loni.ucla.edu/~narr/protocols.php or the related protocols below.
Note: Tractography shown in this protocol was performed in DTIStudio using 30 direction diffusion data.
First ROI: Identify the coronal slice in which the green fibers connecting the temporal and parietal lobes are most intense (marked by arrows; 1). This slice is typically a few slices anterior to the splenium of the corpus collosum. Select these fibers (2). | |
1 |
2 |
Second ROI: Identify the coronal slice in which the tract bunches, typically at the anterior portion of the fornix. Select the circular cluster of fibers running through the corticospinal tract. | |
* Be sure to remove all fibers that are clearly not a part of the tract. Note the inferior longitudinal fasciculus, which has fibers beginning in the temporal lobe and projects similarly to the IFO. |
Sagittal view, left. Ventral axial view, right. |