Method and apparatus for relative calibration of a mobile X-ray C-arm and an external pose tracking system
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United States of America Patent
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N/A
Issued Date -
Dec 20, 2001
app pub date -
Feb 8, 2001
filing date -
Feb 10, 2000
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An external tracking system for use three dimensional (3D) reconstruction with X-ray C-arm systems comprises a set of marker or tool plates and a sensor system. It measures the 6D pose (position and orientation) of these tool plates relative to the sensor. The tool plate of such a tracking system is rigidly attached to the X-ray source frame of the C-arm system. In order to use an external tracking system for the recovery of projection geometry for 3D tomographic reconstruction, the relations of the external sensor coordinate systems to patient/world and X-ray coordinate systems have to be determined. Previously the transformation from tool plate to X-ray coordinate system has been determined based on CAD drawings and a calibration of the focal point of the X-ray system.
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