[Mne_analysis] FLASH sequence for BEM

[Eric Larson]

I would verify that the BEM shell surfaces (inner/outer skull and scalp)
look decent e.g. in tkmedit. If they look good, then you should be okay. I
*think* I have used Flash 5/30 sequences in the past with fewer than 8
echoes without any problems.

Eric


On Thu, Oct 9, 2014 at 2:53 PM, dgw <dgwakeman at gmail.com> wrote:

> Hi Jon,
>
> If your results look comparable, then there shouldn't be a problem.
> The crashing problem can be fixed by adding more RAM to the console
> computer.
>
> HTH,
> D
>
> On Thu, Oct 9, 2014 at 3:07 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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