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.


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

 on behalf of neuroimage analyst 
Date: Thursday, December 1, 2016 at 2:40 PM
To: "hcp-users@humanconnectome.org<mailto:hcp-users@humanconnectome.org>" 
Subject: [HCP-Users] Gradient power amplifier error


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 




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