Electromagnetic system and method
AssigneeThe Ohio State University
InventorsVishwanath Subramaniam, Joseph West, Jennifer McFerran Brock, Emily Sequin, Duxin Sun, Peng Zou, Travis Hamilton Jones
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Abstract
Differences of electromagnetic (EM) properties between healthy and cancerous tissues allow detection of abnormal conditions occurring in a tissue of an animal, for example, intra-operative cancer detection. By using a time-varying EM field, electrical eddy currents are generated in the tissue sample, and assessed using phase-sensitive detection. In some aspects, a change in phase shift between the voltage in a receiver coil and the voltage in a driver coil provide a direct and immediate indication of differences in EM properties of specimens.
Claims26
A system for identifying an abnormal condition occurring in a tissue of an animal or human, comprising:
- a probe shaped in a configuration so that it may be hand-held comprising a driver coil and a receiver coil;
- an alternating current or power supply connected to the driver coil configured to provide a non-sinusoidal, asymmetric signal to the driver coil with a frequency of approximately 100 kHz or less for inducing eddy currents in the tissue when the probe is placed adjacent to the tissue;
- a measurement system, operably connected to the receiver coil and configured to measure a phase shift between the voltage or current on the driver coil and the voltage or current produced thereby in the receiver coil when the driver and receiver coils are positioned adjacent to the tissue, wherein the voltage or current produced in the receiver coil has at least a first and second duty cycle each comprised of multiple peaks and wherein the driver coil and receiver coil has inductances and capacitances so the last peak of the voltage or current produced in the first duty cycle coincides on a sloping side of the first peak of the second duty cycle;
- and
- a processing system operably connected to the measurement system, the processing system programmed with one or more software routines executing on the processing system to:
- 1) identify an abnormal condition in the structure of the tissue based upon the phase shift measured by the measurement system, and 2) develop an image of the tissue using the measured phase shift.
A method for identifying an abnormal condition occurring in a tissue of an animal or human, comprising the steps of:
- placing a probe adjacent to the tissue, the probe shaped in a configuration so that it may be hand-held comprising a driver coil and a receiver coil;
- connecting an alternating current or power supply to the driver coil;
- providing a non-sinusoidal, asymmetric signal to the driver coil with a frequency of approximately 100 kHz or less for inducing eddy currents in the tissue when the probe is placed adjacent to the tissue;
- connecting a measurement system to the receiver coil;
- measuring a phase shift between the voltage or current on the driver coil and the voltage or current produced thereby in the receiver coil when the driver and receiver coils are positioned adjacent to the tissue, wherein the voltage or current produced in the receiver coil has at least a first and second duty cycle each comprised of multiple peaks;
- introducing inductances and capacitances in the driver coil and receiver coil so the last peak of the voltage or current produced in the first duty cycle coincides on a sloping side of the first peak of the second duty cycle;
- connecting a processing system to the measurement system;
- and
- processing the measured phase shift data to identify an abnormal condition in the structure of the tissue and develop an image of the tissue.
A system for identifying an abnormal condition occurring in a tissue of an animal or human, comprising:
- a probe shaped in a configuration so that it may be hand-held comprising a driver coil and a receiver coil;
- an alternating current or power supply connected to the driver coil configured to provide a non-sinusoidal, asymmetric signal to the driver coil with a frequency of approximately 100 kHz or less for inducing eddy currents in the tissue when the probe is placed adjacent to the tissue;
- a measurement system, operably connected to the receiver coil and configured to measure a phase shift between the voltage or current on the driver coil and the voltage or current produced thereby in the receiver coil when the driver and receiver coils are positioned adjacent to the tissue, wherein the voltage or current produced in the receiver coil has at least a first and second duty cycle each comprised of multiple peaks;
- and
- a processing system operably connected to the measurement system, the processing system programmed with one or more software routines executing on the processing system to:
- 1) identify an abnormal condition in the structure of the tissue based upon the phase shift measured by the measurement system, and 2) develop an image of the tissue using the measured phase shift;
- and
- a capacitor added in parallel to the receiver coil so the last peak of the voltage or current produced in the first duty cycle coincides on a sloping side of the first peak of the second duty cycle.
Dependencies are inferred from the claim text.