Hi,

I have a question regarding the series UID of dicom rtstructs.

It seems to me that the series UID of an rtstruct should match the
series UID from which the segmentation was made.  For instance, if I
segment off of a CT image, then the rtstruct that's produced should
have the same series UID as that CT Image, but a different instance
UID (to indicate that it's a different bit of information in the same
series).

I mention this because I'm trying to create rtstructs using this code
here:
http://www.insight-journal.org/browse/publication/316

However, they are creating their own series UID as part of creating
the rtstruct.

If I have multiple 3D series as part of a study (say, one with
contrast and one without), how can I be sure with which series the
rtstruct is associated?

Thanks!

Structure sets should always be in a different series (different Series
Insatnce UID), because:

- the structure sets are produced in a different piece of equipment
   than the images

- they have a different value for Modality

Each structure set optionally references:

- the frame of reference (+/- transforamtion) to which they apply

- the referenced study and series UIDs that contain the images
   "which are used in defining the" the structure set

See PS 3.3 C.8.8.5 Structure Set module.

I don't know whether the tool that you describe includes this
information, but if it doesn't you could add it, since it is
presumably an open source tool.

David

On 2/4/10 12:13 PM, mmr wrote:
> Hi,
>
> I have a question regarding the series UID of dicom rtstructs.
>
> It seems to me that the series UID of an rtstruct should match the
> series UID from which the segmentation was made.  For instance, if I
> segment off of a CT image, then the rtstruct that's produced should
> have the same series UID as that CT Image, but a different instance
> UID (to indicate that it's a different bit of information in the same
> series).
>
> I mention this because I'm trying to create rtstructs using this code
> here:
> http://www.insight-journal.org/browse/publication/316
>
> However, they are creating their own series UID as part of creating
> the rtstruct.
>
> If I have multiple 3D series as part of a study (say, one with
> contrast and one without), how can I be sure with which series the
> rtstruct is associated?
>
> Thanks!