The workshop datasets will consist of four neurosurgical cases acquired at Brigham and Women's Hospital, and two healthy subjects. Each dataset will include Anatomical Images (T1,T2 and FLAIR), a Diffusion Weighted Imaging (DWI) volume, and a Diffusion Tensor Imaging (DTI) volume. Data will be in the ITK-readable Nrrd file format, which consists of an ASCII header file and a separate uncompressed raw image datafile.