[Insight-users] itk::ImageSeriesReader - Use of ReverseOrderOn to Properly Orient Constructed Volume using a CT Data-set

[Mathieu Malaterre]

Ref:
http://www.itk.org/pipermail/insight-users/2008-July/026667.html

itk::GDCMSeriesFileNames will sort correctly in either cases.

-Mathieu

On Mon, Aug 11, 2008 at 11:07 PM, M. Wirtzfeld <wirtzfeld at rogers.com> wrote:
> Good afternoon,
>
> I have a question regarding the use of the itk::ImageSeriesReader class.
>
> I have two sets of images, a CT data-set and an MR data-set.  Both data-sets
> are of a single volume and consist of a sequence of DICOM images.
>
> My registration application reads a single DICOM image that acts as the
> fixed-image (in context of ITK), while the set of DICOM images is read using
> the aforementioned class in order to construct the volume or moving-image
> (again in the ITK context).
>
> When the registration application executes using the MR data-set,
> registration occurs.  However, when the CT data-set is used, the method
> "ReverseOrderOn" must be called to reverse filename order, otherwise the
> volume appears to be "flipped" and there is no overlap between the fixed-
> and moving-images.
>
> I use the itk::ImageFileReader class to read the fixed-image.  Given a
> single image is read using this class, it would not need a method like
> "ReverseOrderOn".  However, this may be the reason for the resulting
> "flipped" volume orientation.
>
> Is there an inherent DICOM characteristic or tag in the DICOM necessitating
> the need to call the "ReverseOrderOn" method?
>
> My immediate solution to this problem is to read the DICOM tag "Modality"
> (0008, 0060), and depending on the type of data-set being used, call the
> "ReverseOrderOn" method when constructing the volume.  This seems like a
> band-aid solution - therefore this posting.  If there is a more correct
> approach, I would certainly like to use it.
>
>
> Suggestions / comment are greatly welcomed!
>
>
> Thanks!
>
> Michael.
>
> Robarts Research
> London, ON
> Canada
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-- 
Mathieu