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²Second goal is to mark inferior edge of PC
åThis is harder, since PC doesnÕt show up well at 1 mm resolution
åFortunately, PC is always at the top of the cerebral aqueduct, which does show up well (at least, if CSF is properly suppressed by the MRI pulse sequence)
åTherefore, if you canÕt see the PC, find mid-sagittal location just at top of cerebral aqueduct and mark it as [PC inferior edge]
²Third goal is to mark two inter-hemispheric points (above corpus callosum)
åThe two points must be at least 2 cm apart
åThe two planes AC-PC-#1 and AC-PC-#2 must be no more than 2o apart
Created with The GIMP
cerebral aqueduct