Radiotherapy objects were DICOM’s first foray into non-image Composite Instances - i.e. data to be stored long-term without pixel data. They are stored, handled, retrieved etc. exactly the same way as images. There are 7 radiotherapy objects:
Radiotherapy Image Radiotherapy Dose Radiotherapy Structure Set Radiotherapy Plan Radiotherapy Beams Treatment Record Radiotherapy Brachy Treatment record Radiotherapy Treatment Summary All these can of course be handled by DicomObjects, but only the Image and Dose can be displayed in a viewer.