Passage: 3D images are calculated from a set of projections acquired during a rotation of the C-Arm around the patient. The volume reconstruction is performed on a separate workstation. The C-Arm and the workstation are connected a communicate continuously. For example, when the user virtually rotates the volume on the workstation to view the anatomy from a certain perspective, the parameter of this view can be transmitted to the angio system, which then drives the C-arm to exactly the same perspective for fluoroscopy. In the same way, if the C-arm angulation is changed, this angulation can be transmitted to the workstation which updates the volume to the same perspective as the fluoroscopic view. The software algorithm that stands behind this process is called registration and can also be done with other DICOM images, such as CT or MRT data acquired preoperatively.

Question: What is the algorithm the helps the process of transmitting to the angio system?
registration