RT Image¶

The RT Image IOD was introduced 1996, so it was one of the very first DICOM objects, defined in Supplement 11.

This IOD adresses the requiremens for image transfer found in general radiotherapy applications performed on conventional simulators, virtual simulators, and portal imaging devices. Such images have a conical imaging geometry and may either be acquired directly from the device, or digitized using a film digitizer. They may or not may have superimposed curves describing beam limiting device (collimator) openings, beam modifying devices, patient structures and target volumes. Numeric beam data parameters may also be recorded with the image, indicating the parameter values at the time the image was taken or created. [From Supplement 11]

The RT Image IOD Module Table consists of some well-known modules (e. g. Patient, General Study, General Image, Image Pixel, ...) but contains - as any RT objects in DICOM - a special Series module, named RT Series Module. The only new module special for this IOD is the RT Image Module. The Multi-Frame Module is included to allow for storing Multi-Frame images. Examples are "multiple exposure portal images" or time-dependendent multiframes to allow for tracking movements for example. For the latter case the Cine Module is also part of the RT Image IOD.