We are working on tracking images with Electromagnetic Tracker (Polhemus Fastrak) using PLUS/Slicer. We have position data from the emt and images from ultrasound system:
Q How do we obtain real-time transform matrices from the tracker ?
I am actually quite curious about that system. Can you get coordinates (e.g., as pointLists, or continuous curves) from that device directly into Slicer?
Yes, you can add the device to slicer using SlicerIGT and get the coordinate values from the EMT in real-time. These tutorials might be helpful: User tutorial | SlicerIGT