Brain anatomy/Corticospinal tract

Here are some loose guidelines for placing the selection boxes to capture the corticospinal tract (CST).

1. Turn on the b=0 image in mid-sagittal view.
2. In one hemisphere, place a rectangular box that is longer in the L-R and A-P directions than the S-I direction (flat, like a pizza box, aligned in the transverse plane).
3. Position the box medially in the fiber bundle so that it captures the full extent of the CST as it courses past the thalamus. The box should be situated approximately as follows:
   • above the mamillary bodies and superior colliculi at the level of the thalamus, but
   • below the body of the fornix.

   The thalamus may be obscured by CSF in a truly mid-sagittal b=0 slice. The box should be placed about in the middle of the S-I extent of the thalamus.