TTT.2.5.2 Encoding Outline
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#### TTT.2.5.2 Encoding Outline

The rotational acquisition can either be encoded as XA Image or as Enhanced XA Image. The XA instance (let's call it "C") is encoded in the Series "B" of the Study "A".

Each reconstruction is related to one cardiac phase corresponding to a sub-set of frames of the rotational acquisition. Therefore, each cardiac phase represents one acquisition context.

Each reconstruction leads to one volume, all volumes are encoded in one single X-Ray 3D Angiographic instance ("Z"). Each volume is for a different cardiac phase. All volumes share the same stack id.

Figure TTT.2.5-1. Encoding of various 3D reconstructions at different cardiac phases

### Note

1. This figure shows only the first three cardiac phases. An implementation may chose how many phases it will reconstruct.

2. Projection frames are assigned to a phase based on their cardiac trigger delay time. The rotation speed and acquisition pulse rate will not necessarily align uniformly with the cardiac cycle (especially if the heartbeat is irregular). Thus different phases may end up with different number of projections assigned to them. The reconstructed volumes will have the same space.

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