"Truncation" artifact in MR images of the internal auditory canal.
Dry skulls and a phantom were studied to determine whether an intracanalicular dark band in MR images of some acoustic neuromas could be artifactual. A "truncation" artifact was detected in the internal auditory canals of the dry skulls and in a simulated internal auditory canal of the phantom when the width of the canal approximately equaled 4 X (field of view) /N, where N equals 128 or 256, depending on the number of gradient steps chosen. The "truncation" artifact should not be confused with CSF between normal nerves when a canal contains tumor.
D006801:Humans; D008279:Magnetic Resonance Imaging; D008961:Models, Structural; D009464:Neuroma, Acoustic / Q000473:pathology*; D013701:Temporal Bone / Q000033:anatomy & histology*