Hello Matteo & Marco,<div><br></div><div>Thijs is probably right, it's most likely that the filesize is too large to be mapped into your RAM. It's a little annoying that the OS doesn't provide anything more informative about the error than "no error", but at least we know it's a failed memory-mapping. I'm surprised this happened with a filesize of 1GB though. </div>
<div><br></div><div>Can you tell us:</div><div>- how much RAM you have installed, and how much swap (type 'free' in a terminal if using Linux). </div><div>- whether you're running the 32-bit or 64-bit version.</div>
<div>Â </div><div>On some platforms, the 32-bit version will only handle a maximum of 2GB of memory mapping, and since you're copying data from a 1GB dataset into another 1GB dataset, that will probably be enough to go over the limit. Shouldn't happen on a 64-bit system, unless potentially you run out of physical memory...</div>
<div><br></div><div>On a separate note: why are you trying to convert the file to mif format? All MRtrix commands will happily handle your 4D analyse file directly (memory permitting)...</div><div>Â </div><div>Cheers,</div>
<div><br></div><div>Donald.</div><div><br></div><div><br><br><div class="gmail_quote">On 20 June 2011 18:23, Thijs Dhollander <span dir="ltr"><<a href="mailto:thijs.dhollander@uzleuven.be">thijs.dhollander@uzleuven.be</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">Hi Matteo & Marco,<br>
<br>
I think you might be right about it being a memory error. Â I remember getting the same error in a different -but then again similar- situation: I was performing TDI, but at a pretty high resolution. Â The final mif file also got created (at what seemed to be the right filesize), but then it gave me the same "no error" error.<br>
<br>
What you could try in your situation (apart from getting more memory :-)), is to import parts of it along some dimensions... if that makes sense for what is in your data and what you want to do with it. Â For instance, if your images have a very high resolution, you could import the upper and lower half of them separately. Â Or if you just acquired many different b-shells, you could import one of them. Â Or if you acquired many repetitions, you could import them separately and then average them, etc...<br>
<br>
Kind regards,<br>
<br>
Thijs Dhollander<br>
PhD Student<br>
<br>
<a href="mailto:thijs.dhollander@uz.kuleuven.ac.be">thijs.dhollander@uz.kuleuven.ac.be</a><br>
tel. +32 16 34 90 37<br>
gsm. +32 475 36 44 27<br>
<br>
Medical Image Computing (K.U.Leuven, ESAT/PSI, MIC)<br>
Medical Imaging Research Center | UZ Gasthuisberg | Herestraat 49 -Â bus 7003Â | B-3000 Leuven | <a href="http://www.medicalimagingcenter.be" target="_blank">http://www.medicalimagingcenter.be</a><br>
<div><div></div><div class="h5"><br>
-----Original Message-----<br>
From: <a href="mailto:mrtrix-discussion-bounces@public.nitrc.org">mrtrix-discussion-bounces@public.nitrc.org</a> [mailto:<a href="mailto:mrtrix-discussion-bounces@public.nitrc.org">mrtrix-discussion-bounces@public.nitrc.org</a>] On Behalf Of Matteo Figini<br>
Sent: vrijdag 17 juni 2011 20:14<br>
To: mrtrix-discussion<br>
Cc: Marco Castelli<br>
Subject: [Mrtrix-discussion] Conversion of 4D analyze file into mif DWi dataset<br>
<br>
Hello<br>
<br>
We have a problem in the import of 4D analyze (hdr/img) images into mrtrix<br>
<br>
We used the following string:<br>
   mrconvert name.img dwi.mif<br>
but we received the following error:<br>
   mrconvert: memmory mapping filed for file 'dwi.mif': No error<br>
<br>
A dwi.mif file of the same size of the img was generated but when we checked it with mrview we can't see any image.<br>
We point out that our img file is about 1GB and we wonder if this could generate a memory error.<br>
<br>
Matteo and Marco<br>
<br>
<br>
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</div></div></blockquote></div><br><br clear="all"><br>-- <br>Jacques-Donald Tournier (PhD)<br>Brain Research Institute, Melbourne, Australia<br>Tel: +61 (0)3 9035 7033<br>
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