I am a beginner in the field of neuroimaging. For the past few weeks I have read various research papers related to Tractography. I am looking to implement some algorithms. For that I have been trying to collect some datasets but I am getting confused of what is actually needed to implement and validate the tractography algorithms. In some datasets I get only .nii files and whereas in some i get .trk files, .fib files and various masks. Does anyone have any dataset arranged in a structured manner with implementation as it will be very useful in getting me started for implementation.