<div dir="ltr">Thanks all! I appreciate the feedback. A memory upgrade would be nice but is not likely in the near future. The 5-echo FLASH sequence is working fine for me on the Trio. The surfaces look good and are nearly identical with either 8 or 5 echoes. <div><br></div><div>Jon</div><div><br></div><div> <br></div><div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Oct 9, 2014 at 5:35 PM, Eric Larson <span dir="ltr"><<a href="mailto:larson.eric.d@gmail.com" target="_blank">larson.eric.d@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr">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.<span class=""><font color="#888888"><div><br></div><div>Eric</div><div><br></div></font></span></div><div class=""><div class="h5"><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Oct 9, 2014 at 2:53 PM, dgw <span dir="ltr"><<a href="mailto:dgwakeman@gmail.com" target="_blank">dgwakeman@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">Hi Jon,<br>
<br>
If your results look comparable, then there shouldn't be a problem.<br>
The crashing problem can be fixed by adding more RAM to the console<br>
computer.<br>
<br>
HTH,<br>
D<br>
<div><div><br>
On Thu, Oct 9, 2014 at 3:07 PM, Jon Houck <<a href="mailto:jhouck@unm.edu" target="_blank">jhouck@unm.edu</a>> wrote:<br>
> Hi all,<br>
><br>
> I've been using FLASH sequences based on the 5- and 30-degree FLASH from MGH<br>
> (<a href="http://www.nmr.mgh.harvard.edu/~andre/MGH_Morphometry_3T.pdf" target="_blank">http://www.nmr.mgh.harvard.edu/~andre/MGH_Morphometry_3T.pdf</a>) with the<br>
> Siemens 32-channel head coil. Image reconstruction fails for this sequence<br>
> on a fairly regular basis, possibly due to the additional data (8 echoes x<br>
> 32 channels) overwhelming the MR acquisition computer. As far as I can tell<br>
> remote reconstruction is only an option for EPI sequences.<br>
><br>
> The simplest option might be dropping a few echoes from the sequence. When<br>
> I do this the inner skull surface produced by a slightly-modified<br>
> mne_flash_bem looks comparable for 8 echoes and for 5 echoes (i.e., the<br>
> echoes at 11.85, 13,85, and 15.85 ms were dropped). I've only been able to<br>
> test this on a couple of subjects. Has anyone done something similar or<br>
> anticipate any problems with BEM construction using this approach?<br>
><br>
> Thanks,<br>
><br>
> Jon<br>
><br>
><br>
><br>
><br>
><br>
><br>
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