Radio frequency impedance mapping
First Claim
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1. A method of determining one or more properties of a body positioned proximate an array of coils having one or more resonant properties, the method comprising acts of:
- detecting a change in at least one resonant property of at least one of the coils in the array; and
determining at least one electromagnetic property of at least one region of the body from the change in the at least one resonant property.
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Abstract
Methods and apparatus for determining dielectric properties such as conductivity, permittivity and/or permeability of a body are provided. An array of resonant coils (950) capable of generating electromagnetic radiation are provided proximate a body (950) to imaged. Properties of the array of coils are influenced by the loading effect of the body. More particularly, one or more resonant properties of the coils are perturbed, the perturbation of which may be measured to obtain an indication of the conductivity, permittivity and permeability of the loading body.
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Citations
119 Claims
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1. A method of determining one or more properties of a body positioned proximate an array of coils having one or more resonant properties, the method comprising acts of:
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detecting a change in at least one resonant property of at least one of the coils in the array; and
determining at least one electromagnetic property of at least one region of the body from the change in the at least one resonant property. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60)
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33. A method of determining one or more properties of a body, the method comprising acts of:
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positioning the body proximate a plurality of coils;
measuring at least one property of at least one of the plurality of coils; and
determining at least one electromagnetic property of at least one region of the body from the at least one property based on at least two of a resistive coupling, a capacitive coupling, and an inductive coupling between at least two of the plurality of coils. - View Dependent Claims (34, 35, 36, 37, 38)
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61. An apparatus for determining one or more properties of a body, the apparatus comprising:
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a plurality of coils having one or more resonant properties;
a first component coupled to the plurality of coils and adapted to provide at least one measurement of the plurality of coils indicative of a change in at least one resonant property of at least one of the plurality of coils; and
a second component coupled to the first component to receive the at least one measurement, the second component adapted to determine at least one electromagnetic property of at least one region of the body based on the change in the at least one resonant property. - View Dependent Claims (62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90)
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91. An apparatus for determining one or more properties of a body, the apparatus comprising:
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a plurality of coils;
a first component coupled to the plurality of coils, the first component adapted to provide at least one measurement of at least one property of the plurality of coils; and
a second component coupled to the first component to receive the at least one measurement, the second component adapted to determine at least one electromagnetic property of at least one region of the body from the at least one measurement based on at least two of a resistive coupling, a capacitive coupling, and an inductive coupling between two or more of the plurality of coils. - View Dependent Claims (92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116)
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117. A computer readable medium encoded with instructions capable of being executed on at least one processor, the instructions, when executed by the at least one processor, performing a method of determining one or more properties of a body positioned proximate a coil array, the method comprising acts of:
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defining an electromagnetic model of the coil array;
receiving an input including a measured impedance matrix of the coil array;
logically partitioning a volume associated with the model of the coil array and the body into a plurality of regions;
assigning trial values respectively to each of the plurality of regions, the trial values including at least one of conductivity, permittivity and permeability;
generating a trial impedance matrix from the assigned trial values according to the electromagnetic model of the coil array; and
reducing a distance between the trial impedance matrix and the measured impedance matrix. - View Dependent Claims (118, 119)
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Specification