[Mne_analysis] FLASH sequence for BEM

[Christopher Bailey]

Hi Jon,

This is off the topic of your question about using only 5 echoes, but  I wanted to mention that we experienced precisely what you describe on our Trio. Incidentally, a spanking new Skyra can handle those 8 echoes on 32 channels just fine. Our work-around was to go with a 12-channel birdcage instead. I figured we'd get good SNR anyway, which appears to be the case. 

Best,

Chris
Aarhus, DK

> On Oct 9, 2014, at 9:07 PM, Jon Houck <jhouck at unm.edu> wrote:
> 
> Hi all,
> 
> I've been using FLASH sequences based on the 5- and 30-degree FLASH from MGH (http://www.nmr.mgh.harvard.edu/~andre/MGH_Morphometry_3T.pdf) with the Siemens 32-channel head coil.  Image reconstruction fails for this sequence on a fairly regular basis, possibly due to the additional data (8 echoes x 32 channels) overwhelming the MR acquisition computer.  As far as I can tell remote reconstruction is only an option for EPI sequences.
> 
> The simplest option might be dropping a few echoes from the sequence.  When I do this the inner skull surface produced by a slightly-modified mne_flash_bem looks comparable for 8 echoes and for 5 echoes (i.e., the echoes at 11.85, 13,85, and 15.85 ms were dropped).  I've only been able to test this on a couple of subjects.  Has anyone done something similar or anticipate any problems with BEM construction using this approach?  
> 
> Thanks,
> 
> Jon
> 
> 
> 
> 
> 
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