IMPEDANCE REGISTRATION AND CATHETER TRACKING
First Claim
1. A method for determining information about a position of an object within a distribution of materials having different complex conductivities, the method comprising:
- causing current to flow in the distribution;
measuring an electrical signal at each of multiple locations in the distribution of materials in response to the current flow;
providing spatial information about the distribution of materials with respect to a first reference frame, the spatial information indicative of regions of different complex conductivity in the distribution of materials; and
determining the position of the object with respect to the spatial information about the distribution of materials based on the measured electrical signals and the spatial information.
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Accused Products
Abstract
Methods and systems are disclosed for determining information about a position of an object within a distribution of materials having different complex conductivities. The method includes: (i) causing current to flow in the distribution; (ii) measuring an electrical signal at each of multiple locations in the distribution of materials in response to the current flow; (iii) providing spatial information about the distribution of materials with respect to a first reference frame, the spatial information indicative of regions of different complex conductivity in the distribution of materials; and (iv) determining the position of the object with respect to the spatial information about the distribution of materials based on measured electrical signals and the spatial information. In certain embodiments, the object is a catheter inserted into a patients heart cavity for cardiac mapping.
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Citations
40 Claims
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1. A method for determining information about a position of an object within a distribution of materials having different complex conductivities, the method comprising:
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causing current to flow in the distribution; measuring an electrical signal at each of multiple locations in the distribution of materials in response to the current flow; providing spatial information about the distribution of materials with respect to a first reference frame, the spatial information indicative of regions of different complex conductivity in the distribution of materials; and determining the position of the object with respect to the spatial information about the distribution of materials based on the measured electrical signals and the spatial information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 39)
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16. A method for determining a transformation for registering first and second reference frames for a distribution of materials, the method comprising:
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causing current to flow in the distribution; measuring an electrical signal at each of multiple locations in the distribution of materials in response to the current flow; providing spatial information about the distribution of materials with respect to the first reference frame, the spatial information indicative of regions of different complex conductivity in the distribution of materials; providing positions in the second reference frame for the multiple locations at which the electrical signals are measured; and determining the transformation based on the measured electrical signals, the spatial information about the distribution of materials, and the positions in the second reference frame for the multiple locations at which the electrical signals are measured. - View Dependent Claims (17)
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18. A system for determining information about a position of an object within a distribution of materials having different complex conductivities, the system comprising:
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electronics for causing current to flow in the distribution; electronics for measuring an electrical signal at each of multiple locations in the distribution of materials in response to the current flow; and an electronic processor coupled to current causing and signal measuring electronics, wherein the electronic processor is configured to determine the position of the object with respect to spatial information about the distribution of materials based on the measured electrical signals and the spatial information, wherein the spatial information is indicative of regions of different complex conductivity in the distribution of materials with respect to a first reference frame. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 40)
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37. A system for determining a transformation for registering first and second reference frames for a distribution of materials, the system comprising:
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electronics for causing current to flow in the distribution; electronics for measuring an electrical signal at each of multiple locations in the distribution of materials in response to the current flow; and an electronic processor coupled to the current causing and signal measuring electronics and configured to determine the transformation based on the measured electrical signals, a spatial information about the distribution of materials with respect to the first reference frame, and positions in the second reference frame for the multiple locations at which the electrical signals are measured, wherein the spatial information about the distribution of materials with respect to the first reference frame is indicative of regions of different complex conductivity in the distribution of materials. - View Dependent Claims (38)
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Specification