Phase-contrast MRI data of 18 Chiari-I malformation patients and 21 controls

We collected phase-contrast MRI data (5-mm midline sagittal section, rostro-caudal direction) and obtained average velocity in certain Regions-0f-Interest (ROIs). The measured ROIs are cerebellar tonsil, ventral spinal subarachnoid space, dorsal spinal subarachnoid space, upper portion of syrinxes, upper cervical cord, and medulla. Data obtained from 18 Chiari-I patients (preoperative and postoperative) and 21 controls are included. Because the preoperative MRI data was missing in one patient, the preoperative studies included 17 MRI sessions. The unit of the data is cm/sec. The data are synchronized with pre-processing so that the rise of the caudal CSF movement be placed at the center of the cardiac cycle.