Hi all, I’m interested in setting up a diffusion protocol similar to the CCF protocol and have two questions. First, what’s the difference between the dir98 and dir99 acquisitions (beyond having different vectors)? It looks like both sample on 2 shells, use the same b-values, and have about 50:50 vectors on each shell, so I’m not clear on why both are needed.
Second, I was playing around with the Caruyer q-space sampling tool and noticed that the output differs from the vectors provided as part of the CCF protocol. Specifically, for dir98, they match for 1 shell, but the vector magnitudes in the other shell have been shortened to .7071. My guess is that this is necessary to tell the scanner to use the second b-value (e.g., 1500). Is that correct? Best, Jeff -- Jeffrey M. Spielberg, Ph.D. Assistant Professor, Clinical Science Department of Psychological and Brain Sciences University of Delaware Newark, DE 19716 Office: 307 McKinly Laboratory Lab: Suite 405 Wolf Hall Phone: 302.831.7078 Email: [email protected]<mailto:[email protected]> Website: http://sites.udel.edu/jmsp/ _______________________________________________ HCP-Users mailing list [email protected] http://lists.humanconnectome.org/mailman/listinfo/hcp-users
