Dr. Herschell F. Murry Profile

Dr. Herschell F. Murry

Director of Engineering at Polhemus Inc

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Proceedings Article | 24 April 1996 Paper

ac magnetic trackers for biomedical application: now and in the near future

Herschell Murry

Proceedings Volume 2676, (1996) https://doi.org/10.1117/12.238798

KEYWORDS: Transmitters, Magnetic tracking, Magnetism, Sensors, Metals, Biomedical optics, Distortion, Magnetic sensors, Tablets, Ionizing radiation

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A number of ac magnetic trackers have been, and are now being, used in the medical community for varied applications from describing electronically the exact shape of a subject to tracking movement of objects. A good reason for using this technology is that the magnetic fields pass through the body without occlusions and without ionizing radiation. This paper commences with descriptions of several such tools readily available, including our 3D input stylus and 3DRAW tablet defining object dimensions to 0.01' accuracy and our close-in Short Ranger transmitter operating precisely between 2' - 12' over the subject. For the future, R&D and military electronics sponsored topics such as a metal distortion insensitive magnetic source, a high performance 240 Hz (or up to eight sensors each operating at 30 Hz) tracker with the processing power to virtually eliminate metal distortion effects and an approach for building a biologically insertible tracker are discussed to indicate the potential for new tracking tools. Discussion of needs from the medical community is encouraged in order to better guide efforts in applying our specialty technology to biomedical applications where ewe are neophytes.

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