TTT.2.4.2 Encoding Outline
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#### TTT.2.4.2 Encoding Outline

The rotational acquisitions can be encoded either as a single instance (e.g., "C") containing several rotations or as several instances (e.g., "C1", "C2", etc.) containing one rotation per instance. The rotational acquisitions can either be encoded as XA Image(s) with limited frame-specific attributes or as Enhanced XA Image(s), with frame-specific attributes encoded that inform the algorithms to reconstruct a volume data set.

The reconstructed volume data set is encoded as a single X-Ray 3D Angiographic instance. The reconstructed region covers typically the full field of view of the projected matrix size.

All frames of the original XA Images or Enhanced XA Images are used to reconstruct the volume.

The X-Ray 3D instance references the original acquisition instances and records attributes of the projections describing the acquisition context.

Figure TTT.2.4-1. Encoding of one 3D reconstruction from three rotational acquisitions in one instance

Figure TTT.2.4-2. Encoding of one 3D reconstruction from two rotational acquisitions in two instances

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