Calibration of an Orientation Sensor for Freehand 3D Ultrasound
Author Information
Author(s): Housden Richard James, Treece Graham M, Gee Andrew H, Prager Richard W
Primary Institution: Department of Engineering, University of Cambridge
Hypothesis
Can the Xsens MT9-B orientation sensor improve the accuracy of freehand 3D ultrasound reconstructions?
Conclusion
A hybrid system incorporating the MT9-B offers a good balance between quality and ease of use, although it does not fully eliminate linear drift.
Supporting Evidence
- The MT9-B can be calibrated to a precision of around 1°.
- Reconstruction accuracy is also around 1°.
- The MT9-B was able to eliminate angular drift in sensorless reconstructions.
Takeaway
This study shows that using a special sensor can help make 3D ultrasound images clearer, but it still has some problems with accuracy in certain directions.
Methodology
The MT9-B sensor was calibrated and its precision and accuracy were measured through repeated calibrations and comparisons with known orientations.
Potential Biases
Potential magnetic field distortions can affect the accuracy of the MT9-B readings.
Limitations
The MT9-B sensor does not correct for linear drift in the elevational direction.
Digital Object Identifier (DOI)
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