Model-based correction of position measurements
AssigneeBiosense Webster, Inc.
InventorsAssaf Govari, Andres Claudio Altmann, Yaron Ephrath
Life of this patent
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Abstract
Visualization of a probe when impedance-based measurement technology is being used is improved by stabilizing a displayed image of the probe or catheter. Using a model of reasonable probe shapes and a matching algorithm, an erroneous probe image is adjusted so that it assumes a realistic shape on a display. A range of positional variations is also incorporated in the model. When an apparent probe position exceeds a permissible range of motion, the probe image is constrained to a realistic position.
Claims18
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A method of determining a position of a probe that has been inserted into a body of a subject, comprising the steps of:
- maintaining a model of topologies comprising a range of shapes assumable by said probe;
- determining an apparent conformation of said probe in said body;
- establishing that said apparent conformation is outside said range;
- referencing said model to determine a true conformation of said probe;
- adjusting said apparent conformation to said true conformation and
- displaying said true conformation.
The method according to 5, further comprising the step of adjusting an apparent position of said probe to a true position responsively to said step of referencing said model.
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An apparatus for position sensing, comprising:
- a probe, comprising a plurality of probe electrodes, which is adapted to be inserted into a body of a subject;
- a plurality of body surface electrodes, which are adapted to be fixed to a surface of said body at respective locations;
- a display;
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- a controller, which is adapted to be coupled to said probe and to said body surface electrodes so as to pass electrical currents through said body between said probe electrodes and said body surface electrodes, and to determine position coordinates of said probe by measuring respective characteristics of said currents passing through said body surface electrodes, said controller being operative for:
- maintaining a model of topologies comprising a range of shapes assumable by said probe;
- determining an apparent conformation of said probe in said body;
- establishing that said apparent conformation is outside said range;
- referencing said model to determine a true conformation of said probe;
- adjusting said apparent conformation to said true conformation and
- displaying said true conformation.
Dependencies are inferred from the claim text.