How to delete one structure from loaded DICOM StructureSet

[mfizyczka]

I'd like to delete structures of Type "MARKER" from the Structure Set.

Using selector I can find these structures:

var selector = dcm.GetSelector();
var roiTypes = selector.RTROIObservationsSequence.Select(s => s.RTROIInterpretedType_);
foreach (var roiType in roiTypes)
{
if (roiType.Data == "MARKER")
{
// do sth, preferably delete from dcm / selector
}
}

How can I delete the structure?
I now that the same structure has to be deleted (based on ReferencedROINumber), from:

• RTROIObservationsSequence
• StructureSetROISequence
• ROIContourSequence