Re: [HCP-Users] aliasing in diffusion images

[Harms, Michael]

What are your settings on all the parameters on the Sequence:Special tab? --  Michael Harms, Ph.D. ----------------------------------------------------------- Conte Center for the Neuroscience of Mental Disorders Washington University School of Medicine Department of Psychiatry, Box 8134 660 South Euclid Ave. Tel: 314-747-6173 St. Louis, MO  63110 Email: mha...@wustl.edu From: "Mark A. Pinsk" <mpi...@gmail.com> Date: Monday, November 23, 2015 10:39 AM To: "hcp-users@humanconnectome.org" <hcp-users@humanconnectome.org> Subject: [HCP-Users] aliasing in diffusion images Hi all, I've attempted to collect diffusion data with the CMRR sequence at our Prisma, and got aliasing in the image (very apparent at higher b value).  Snapshot here:   https://dl.dropboxusercontent.com/u/3889124/b2500-MB3.tiff Any suggestions on what the issue(s) could be?   I see the same when I lower MB from 3 to 2. Here are my protocol parameters: 64-channel head/neck coil 90 interleaved transverse slices in-plane resolution = 1.5mm slice thickness = 1.5mm with no inter-slice gap field of view (FOV) = 210mm base resolution = 140 repetition time (TR) = 4200ms echo time (TE) = 87ms flip angle (FA) = 78 deg refocus FA = 160 deg phase partial fourier (PPF) = 6/8 gradient reversed fat suppression phase encode (PE) direction = anterior/posterior bandwidth = 1880Hz/Px echo spacing (ES) = 0.71ms multiband acceleration factor = 3 SENSE (R=1) image reconstruction bmax = 2500 s/mm^2 thanks! Mark _______________________________________________ HCP-Users mailing list HCP-Users@humanconnectome.org http://lists.humanconnectome.org/mailman/listinfo/hcp-users   The materials in this message are private and may contain Protected Healthcare Information or other information of a sensitive nature. If you are not the intended recipient, be advised that any unauthorized use, disclosure, copying or the taking of any action in reliance on the contents of this information is strictly prohibited. If you have received this email in error, please immediately notify the sender via telephone or return mail. _______________________________________________ HCP-Users mailing list HCP-Users@humanconnectome.org http://lists.humanconnectome.org/mailman/listinfo/hcp-users