KK Use Cases For The Composite Instance Root Retrieval Classes (Informative)
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# KK Use Cases For The Composite Instance Root Retrieval Classes (Informative)

The use cases fall into five broad groups:

## KK.1 Clinical Review

### KK.1.1 Retrieval Based On Report References

A referring physician receives radiological diagnostic reports on CT or MRI examinations. These reports contain references to specific images. He chooses to review these specific images himself and/or show the patient. The references in the report point to particular slices. If the slices are individual images, then they may be obtained individually. If the slices are part of an enhanced multi-frame CT/MR object, then retrieval of the whole multi-frame object might take too long. The Composite Instance Root Retrieve Service allows retrieval of only the selected frames.

The source of the image and frame references in the report could be KOS, CDA, SR, presentation states or other sources.

Selective retrieval can also be used to retrieve 2 or more arbitrary frames, as may be used for digital subtraction (masking), and may be used with any multi-frame objects, including multi-frame ultrasound, XR etc.

Features of interest in many long "video" examinations (e.g., endoscopy) are commonly referenced as times from the start of the examination. The same benefits of reduced WAN bandwidth use could be obtained by shortening the MPEG-2, MPEG-4 AVC/H.264 or JPEG 2000 Part 2 Multi-component based stream prior to transmission.

### KK.1.2 Selective Retrieval Without References to Specific Slices

Retrieval using the Composite Instance Retrieve Without Bulk Data Retrieve Service allows determination and retrieval of a suitable subset of frames. This could for instance be used to retrieve only the slices with particular imaging characteristics (e.g., T2 weighting from an enhanced MR object).

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