TTT.2.5.4 Example
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#### TTT.2.5.4 Example

In this example the gantry performs one single rotation around the heart at 20 degrees per second, covering an arc of 200 degrees during 10 seconds. Approximately 10 cardiac cycles are acquired. The frame rate is 8 frames per second, resulting in 8 projections acquired at each cardiac cycle corresponding to 8 different cardiac phases.

Overall there will be 80 projections; 10 projections for each of the 8 cardiac phases. Each cardiac phase represents one acquisition context. The information of the cardiac trigger delay time is encoded for each projection. The projections are encoded as an XA Image with the Instance UID "C".

The reconstruction application creates 8 volumes, each volume is reconstructed by a back-projection from the 10 frames having the same cardiac trigger delay time, i.e., the frames acquired at the same cardiac phase. Each volume contains 256 frames. The 8 reconstructed volumes are encoded in one single X-Ray 3D Angiographic instance of Instance UID "Z".

Figure TTT.2.5-2. Common Attributes of 3D Reconstruction of Three Cardiac Phases

Figure TTT.2.5-3. Per-Frame Attributes of 3D Reconstruction of Three Cardiac Phases

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