Hey Doug,

I believe for this patient/hemisphere the number of vertices is 157373.

What is the workaround in the case my number of vertices is unluckily a
prime?

Thank you,
Omer Tal


> Hi Omar, how many vertices? The reshape only works if the number is not
> prime (actually the largest prime factor has to be less than 2^15.
> doug
>
> Omer Tal wrote:
>> Hey Bruce,
>>
>> Thank you for the prompt response.
>>
>> The line is as follows:
>>
>> mri_convert -it mgh -ot nii test.mgh test.nii.
>>
>> Since I do agree that the issue is arising from the NIFTI bit limit, i
>> tried doug's suggestion of
>>
>> mri_surf2surf --sval test.mgh --tval test.nii --reshape-factor 6 --s
>> subject_name --hemi lh
>>
>> But it doesn't seem to solve the problem. even though now i can load it
>> through FSL without it failing and quitting, the image is faulty w/ over
>> 78,000 data points in the X direction, none in Y, and 240 in Z. At this
>> point, Doug told him to send the file in and no more follow-up is
>> shown...
>>
>> Please advise.
>>
>> Thank you very much,
>> Omer Tal
>> UCSD Keck Center for Functional MRI
>>
>>
>>> Hi Omer
>>>
>>> what file are you trying to convert? What is your entire command line
>>> with output and what problems do you have? Nifti unfortunately only
>>> allows
>>> 16 bits for the width/height/depth/nframes, so surface overlays can't
>>> usually fit as nvertices x 1 x 1 x nframes since nvertices > 2^16 (or
>>> 2^15
>>> signed).
>>>
>>> cheers
>>> Bruce
>>>
>>>
>>> On Mon, 6 Feb 2012, Omer
>>> Tal wrote:
>>>
>>>
>>>> Hey there,
>>>>
>>>> I am trying to convert an mgh file I created into an nii volume so I
>>>> can
>>>> load it in AFNI. I was trying to use mri_convert, which I have used
>>>> previously to make nii volumes from my aparc+aseg and it worked great,
>>>> but
>>>> this time the resulting file is faulty.
>>>>
>>>> I've noticed a previous thread where someone ran into a similar
>>>> problem,
>>>> and it had to do w/ too many vertices existing for NIFTI, and Doug
>>>> suggested using mri_surf2surf, but it didn't work for that guy or me
>>>> (at
>>>> which point I think he was sending you files).
>>>>
>>>> Seems like it should be something common and trivial, but I can't get
>>>> it
>>>> too work, any suggestions?
>>>>
>>>> Thank you,
>>>> Omer Tal
>>>> UCSD Keck Center for Functional MRI
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>>>>
>>>>
>>>>
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>
> --
> Douglas N. Greve, Ph.D.
> MGH-NMR Center
> gr...@nmr.mgh.harvard.edu
> Phone Number: 617-724-2358
> Fax: 617-726-7422
>
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