Reading sequences correctly

[A.Bird]

I am working with Radiotherapy Dicom.  The plan file has many sequences in it and therefore it's important to have certainty in the methods used to read sequences.  I have managed to read tags out of the sequences, but I should really write a method which is able to retrieve a tag from within nested sequences, e.g. Beam,ControlPoints.  I would like some help figuring out how this is correctly/best done.

So for example, I'd like to retrieve the the MLC position in Control point 4 in beam 3.  Obviously, any nested sequence solution will need the same thing - so perhaps scope is beyond RT.

Many thanks for any help.
Andrew.

[Michael Knapp]

final DicomElement de = dataset.get(tag);
if (de != null)
{
    for (int i=0; i<de.countItems(); i++)
    {
         DicomObject nested = de.getDicomObject(i);
         // ....


    }
}

[A.Bird]

Thankyou, very much appreciated.  Is tagpath an alternative? or have I misunderstood the API there.

Thanks again,
Andrew

[Michael Knapp]

tagPath should also work:

de.getNestedDicomObject(new int[] { tag1, index1, tag2, index2 });