[Mne_analysis] FLASH sequence for BEM

[Andrew R. Dykstra]

Hi Jon,

Actually, in Heidelberg, we didn't have a multi-echo FLASH sequence
available to us when we first started using the MNE software, but we've
managed to do just fine using only a single echo (TE: 1.86 ms) from each of
two flip angles (5 and 30 degrees) corresponding to the left-most images of
Fig. 9 of this paper
<http://nmr.mgh.harvard.edu/~fischl/reprints/sequence_independent_segmentation_reprint.pdf>
.

HTH,
Andy

On Thu, 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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