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> For extra points, have alignment sticker targets you can attach to the body to track the patient if they move

This is roughly how surgical navigation systems work. The leaders in this area are companies like BrainLab and Medtronic, usually using optical tracking sensors (e.g. from Northern Digital), or sometimes electromagnetic, with accuracy in the 1-5mm range. For neurosurgery (the area I'm most familiar with), several companies offer tracked ultrasound integration, usually for live overlay and comparison with pre-operative MR or CT images.

> combine it with the positioning sensors of a VR system

For any folks interested in this, there is an active, excellent open source project called PLUS focused on ultrasound, tracking, and sensor data acquisition, as well as volume reconstruction [2]. There's also an associated 3d visualization ecosystem [3].

[1] http://www.ndigital.com/ [2] https://app.assembla.com/spaces/plus/wiki [3] http://www.slicer.org




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