[Mrtrix-discussion] MRConvert fails on Siemens Skyra DTI dicom data

[Amanda Ng]

Hi Donald,

I've had a closer look at the data and they appear to be storing it
using this new 'multi-frame' encoding in the DICOM standard.

ftp://medical.nema.org/medical/dicom/Multiframe/RSNA05-EnhCTMR-DemonstrationF.pdf

The pixel data is in a 3D format, and the individual slice parameters
(eg Image Position (Patient)) are stored in data tag (5200, 9230)
Per-frame Functional Groups. Some of the other tags, such as (0028,
1053) Rescale Slope, have moved to within the tag (5200, 9229) Shared
Functional Groups.

I'll upload an example dataset to DropBox.

Amanda

On 20 April 2012 17:09, Donald Tournier <d.tournier at brain.org.au> wrote:
> Hi Amanda,
>
> I'm surprised with this error. I'm assuming these data were acquired using a
> product sequence? Are the data stored as a mosaic image? In any case, the
> easiest thing would be to send me an example dataset, preferably using
> Dropbox (linked to this email address).
>
> Cheers,
>
> Donald.
>
>
> On 16 April 2012 01:34, Amanda Ng <amanda.ng at monash.edu> wrote:
>>
>> Hi,
>>
>> mrconvert fails when run on Siemens Skyra DTI dicom datasets. The
>> following is the output
>>
>> mrconvert: scanning DICOM folder
>> "../dicom_series/21_ep2d_diff_mddw_30_p2/"  - ok
>> mrconvert: reading DICOM series "ep2d_diff_mddw_30_p2"... 100%
>> Assertion failed: (!gsl_isnan(distance)), function operator<, file
>> lib/file/dicom/image.cpp, line 191.
>> Abort trap: 6
>>
>> I can provide an example dataset if required.
>>
>> Thanks,
>> Amanda
>> _______________________________________________
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>> Mrtrix-discussion at www.nitrc.org
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>
>
>
>
> --
> Jacques-Donald Tournier (PhD)
> Brain Research Institute, Melbourne, Australia
> Tel: +61 (0)3 9035 7033