Method for localizing a medical instrument introduced into the body of an examination object
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Accused Products
Abstract
A method for localizing a medical instrument, in particular a catheter or guide wire, introduced into the body of an examination object, comprising the steps: arrangement of at least four electrodes on the body of the examination object, recording of three-dimensional image data of a body region of the examination object that is of interest by means of an imaging medical examination device, determination of a model of the electrical conductivity of the examination object as a function of the recorded three-dimensional image data, determination of the electric field distribution when a voltage and/or current is/are applied for at least three different electrode pairs formed from the four electrodes as a function of the conductivity model and the spatial positions of the electrodes, not all the electrodes lying in one plane, application of a voltage and/or a current at each electrode pair and determination of a voltage value at an electrode of the medical instrument for the at least three electrode pairs and determination of the spatial position of the medical instrument as the point of intersection of the equipotential surfaces assigned to the at least three voltage values at the electrode of the medical instrument.
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Citations
35 Claims
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1-15. -15. (canceled)
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16. A method for locating a medical instrument introduced into a body of an examination object, comprising:
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arranging at least four electrodes at the body of the examination object;
recording a three-dimensional image data of a body region of the examination object by an imaging medical examination device;
determining an electrical conductivity model of the examination object as a function of the three-dimensional image data;
determining an electric field distribution of the examination object as a function of the electrical conductivity model and spatial positions of the electrodes if a voltage is applied for at least three different electrode pairs formed from the four electrodes which do not all lies in one plane;
applying the voltage at each of the three electrode pairs respectively;
determining three voltage values at an electrode of the medical instrument for the applied voltage at each of the three electrode pairs respectively; and
determining a spatial position of the medical instrument as a point of an intersection of equipotential surfaces assigned to the three voltage values at the electrode of the medical instrument. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A method for locating a medical instrument introduced into a body of an examination object, comprising:
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arranging at least four electrodes at the body of the examination object;
recording a three-dimensional image data of a body region of the examination object by an imaging medical examination device;
determining an electrical conductivity model of the examination object as a function of the three-dimensional image data;
determining an electric field distribution of the examination object as a function of the electrical conductivity model and spatial positions of the electrodes if a current is applied for at least three different electrode pairs formed from the four electrodes which do not all lies in one plane;
applying the current at each of the three electrode pairs respectively;
determining three voltage values at an electrode of the medical instrument for the applied current at each of the three electrode pairs respectively; and
determining a spatial position of the medical instrument as a point of an intersection of equipotential surfaces assigned to the three voltage values at the electrode of the medical instrument.
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34. A device for locating a medical instrument introduced into a body of a patient, comprising:
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a patient supporting table which supports a patient having at least four electrodes arranged at the body of the patient;
a unit connected with the electrodes which generates and detects signals of the electrodes;
a medical imaging device which records a three-dimensional image data of a body region of the patient; and
a processing device which;
determines an electrical conductivity model of the patient as a function of the three-dimensional image data, determines an electric field distribution of the patient as a function of the electrical conductivity model and spatial positions of the electrodes if a voltage is applied for at least three different electrode pairs formed from the four electrodes which do not all lies in one plane, determines three voltage values at an electrode of the medical instrument after applying the voltage at each of the three electrode pairs respectively, and determines a spatial position of the medical instrument as a point of an intersection of equipotential surfaces assigned to the three voltage values at the electrode of the medical instrument. - View Dependent Claims (35)
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Specification