Hi, Re (1): I believe you need a license to run in FREE mode. Do you have it? Re (2): By how much was it clipped? You could try reducing the flip angles — 78/160 is what we’ve been using for HCP. Or, increase the duration of the relevant pulse on the Sequence:Special tab. Re (3): I see that your b_max is 2500 (not 1500). Do you have multiple high b-value frames in a row? If so, try interspersing them with the b=1000 frames. It is a bit of a trial and error process.
cheers, -MH -- 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: <hcp-users-boun...@humanconnectome.org<mailto:hcp-users-boun...@humanconnectome.org>> on behalf of neuroimage analyst <neuroimage.anal...@gmail.com<mailto:neuroimage.anal...@gmail.com>> Date: Thursday, December 1, 2016 at 2:40 PM To: "email@example.com<mailto:firstname.lastname@example.org>" <email@example.com<mailto:firstname.lastname@example.org>> Subject: [HCP-Users] Gradient power amplifier error Hi, We just installed the CMRR sequence on 3T Skyra (IDEA: VE11C). This was our first attempt to run the sequence on the scanner. Our desired resolution was 1.5mm3 with 64 diffusion directions and 2 b-values (1K, 1,5K) and one b0. I have attached the sequence and the snapshot of the error. MB = 3, GRAPPA = 2; monopolar gradients; and MDDW diffusion mode. 1. We were unable to set the diffusion mode to FREE. It was greyed out. How do we change that? 2. Before the sequence ran, it gave an error of 1RF pulse clipped. Is there something that we can change so that we dont get this warning? 3. How can we resolve the power amplifier error? We will appreciate any response that can help us to run the sequence on the scanner. Thanks Regards VM. _______________________________________________ HCP-Users mailing list HCP-Users@humanconnectome.org<mailto: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