Optically tracked, single-coil, scanning magnetic induction tomography

Joe R. Feldkamp; Stephen Quirk

doi:10.1117/12.2254435

9 March 2017 Optically tracked, single-coil, scanning magnetic induction tomography

Joe R. Feldkamp, Stephen Quirk

Proceedings Volume 10132, Medical Imaging 2017: Physics of Medical Imaging; 101324P (2017) https://doi.org/10.1117/12.2254435
Event: SPIE Medical Imaging, 2017, Orlando, Florida, United States

Abstract

Recent work has shown the feasibility of single-coil, magnetic induction tomography, for visualizing a 3D distribution of electrical conductivity in portions of the human body. Loss is measured in a single, planar coil consisting of concentric circular loops while the coil is relocated to various non-redundant positions and orientations in the vicinity of the target. These loss values, together with measured coil position and orientation, are processed by a quantitative mapping equation that enables reconstruction of an electrical conductivity image. Up until now, the position of the coil had to be established by a template, which required assignment of locations for the coil to visit without necessarily giving any prior consideration to target geometry. We have now added optical tracking to our existing single-coil device so that position and orientation are tracked automatically, allowing collection of coil loss data at arbitrary positions or orientations as needed. Optical tracking is accomplished via a set of IR reflective spheres mounted on the same enclosure that supports the coil. Position for a select sphere within the set, together with the four quaternions specifying optical body orientation, is fed to a laptop at the same time coil loss data is streamed to the same laptop via Bluetooth. The coil center can be tracked with sub-millimeter accuracy while orientation angle is known to a fraction of a degree. This work illustrates the use of single-coil MIT in full, position-orientation-tracked scan mode while imaging laboratory phantoms. Phantoms are based upon simple materials having biologic conductivity (< 5 S/m), including a cut of bone-in steak. The goal is not just to reconstruct an image that contains the features of the actual target, but also return correct conductivity values for the various features within the image.

Citation Download Citation

Joe R. Feldkamp and Stephen Quirk "Optically tracked, single-coil, scanning magnetic induction tomography", Proc. SPIE 10132, Medical Imaging 2017: Physics of Medical Imaging, 101324P (9 March 2017); https://doi.org/10.1117/12.2254435

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