I have download IBSR_V2.0, which contains 18 subjects of IBSR_01_ANALYZE.tgz and IBSR_01parc_ANALYZE.tgz to IBSR_18_ANALYZE.tgz and IBSR_18parc_ANALYZE.tgz. Each IBSR_01_ANALYZE.tgz folder contains two subfolders that are images and segmentation. But, I am unable to open the disc image files, and also couldn't find where is the corresponding ground truth images of IBSR dataset. Please also provide the information about IBSR_01parc_ANALYZE.tgz folder. I couldn't find IBSR_01_CMA.tgz file that is explained in the readme file.