Threshold selection criteria for quantification of lumbosacral cerebrospinal fluid and root volumes from MRI.

Background And Purpose: The high variability of CSF volumes partly explains the inconsistency of anesthetic effects, but may also be due to image analysis itself. In this study, criteria for threshold selection are anatomically defined.

Methods: T2 MR images (n = 7 cases) were analyzed using 3-dimentional software.