DICOM PS3.17 2019b - Explanatory Information

TTT.2.7 Case #7: Spatial Registration of 3D X-Ray Angiography With Enhanced XA

This application case is related to the spatial registration of the X-Ray 3D volume with a static projection acquisition on the same anatomical region during the procedure.

TTT.2.7.1 User Scenario

The image acquisition system performs two different 2D acquisitions at two different times of the interventional procedure: one rotational acquisition with a 3D reconstruction, and one static acquisition.

Between the two acquisitions, the table position has changed with respect to the Isocenter. As the acquisitions are performed with the X-Ray Detector centered on the Isocenter, in the second static acquisition the anatomical region of the 3D volume is not centered anymore at the Isocenter due to the table movement. It's assumed that there is still part of the anatomy of the 3D volume that is projected in the static acquisition.

During the intervention the 3D volume is segmented to extract some anatomy that is less or not visible in the static acquisition (e.g., injected vessels, heart chambers). The user will want to display such 3D anatomy over the 2D static image to visually assess the placement of interventional devices like guide wires, needles etc. The patient position on the table does not change during the procedure.

Rotational acquisition and the corresponding 3D reconstruction

Figure TTT.2.7-1. Rotational acquisition and the corresponding 3D reconstruction


Static Enhanced XA acquisition at different table position

Figure TTT.2.7-2. Static Enhanced XA acquisition at different table position


DICOM PS3.17 2019b - Explanatory Information