METHOD FOR ELECTROIMPEDANCE TOMOGRAPHY
First Claim
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1. A method for data acquisition by means of a device for electroimpedance tomography, the method comprising the steps of:
- attaching electrodes conductively to a circumference of a test subject at spaced locations in order to generate an image of the electric resistance over the cross-sectional area covered by the electrodes by means of a reconstruction algorithm from voltage potential difference measurements caused at the remaining electrodes by current feeds via the remaining electrodes;
identifying an electrode as a defect electrode, which has no contact with the body, by means of an impedance measurement;
performing current feeds such that at least the defect electrode is jumped over; and
determining voltage potentials over the defect electrode in an area of the defect electrode in such a way the defect electrode is jumped over at least once.
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Abstract
A method for electroimpedance tomography makes possible an analysis and reconstruction of an image of the electric resistance in the presence of a defect electrode (A). The method includes the steps of identifying an electrode as a defect electrode (A), which has no contact with the body, by means of an impedance measurement, of performing current feeds such that at least the defect electrode (A) is jumped over, and of determining voltage potentials in the area of the defect electrode (A) over the defect electrode (A) in such a way that the defect electrode (A) is jumped over at least once.
8 Citations
13 Claims
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1. A method for data acquisition by means of a device for electroimpedance tomography, the method comprising the steps of:
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attaching electrodes conductively to a circumference of a test subject at spaced locations in order to generate an image of the electric resistance over the cross-sectional area covered by the electrodes by means of a reconstruction algorithm from voltage potential difference measurements caused at the remaining electrodes by current feeds via the remaining electrodes; identifying an electrode as a defect electrode, which has no contact with the body, by means of an impedance measurement; performing current feeds such that at least the defect electrode is jumped over; and determining voltage potentials over the defect electrode in an area of the defect electrode in such a way the defect electrode is jumped over at least once. - View Dependent Claims (2, 3, 4, 5)
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6. A method of electroimpedance tomography data acquisition comprising the steps of:
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attaching electrodes conductively to a circumference of a test subject at spaced locations; generating an image of the electric resistance over the cross-sectional area covered by the electrodes using a reconstruction algorithm from voltage potential difference measurements between measuring pairs of electrodes upon current feed at a feed pair of electrodes wherein a feed position and measuring positions are changed to change the feed pair of electrodes and to change the measuring pairs of electrodes and a data set of voltage potential difference measurements between measuring pairs of electrodes is provided for the feed pair of electrodes and the electrodes comprising the feed pair of electrodes change for each feed position to provide changed measuring positions with further data sets of voltage potential difference measurements; identifying an electrode as a defect electrode by impedance measurement; performing current feeds such that an electrode adjacent to the defect electrode is used to form the feed pair of electrodes instead of the defect electrode; determining voltage potential differences such that an electrode adjacent to the defect electrode is used to form one of the measuring pairs of electrodes instead of the defect electrode. - View Dependent Claims (7, 8, 9, 13)
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10. An electroimpedance tomography data acquisition system comprising:
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electrodes for attachment conductively to a circumference of a test subject at spaced locations; a control unit for generating an image of the electric resistance over the cross-sectional area covered by the electrodes using a reconstruction algorithm from voltage potential difference measurements between measuring pairs of electrodes upon current feed at a feed pair of electrodes wherein a feed position and measuring positions are changed to change the feed pair of electrodes and to change the measuring pairs of electrodes and a data set of voltage potential difference measurements between measuring pairs of electrodes is provided for the feed pair of electrodes and the electrodes comprising the feed pair of electrodes change for each feed position to provide changed measuring positions with further data sets of voltage potential difference measurements, the control unit; identifying an electrode as a defect electrode by impedance measurement; performing current feeds such that an electrode adjacent to the defect electrode is used to form the feed pair of electrodes instead of the defect electrode; determining voltage potential differences such that an electrode adjacent to the defect electrode is used to form one of the measuring pairs of electrodes instead of the defect electrode. - View Dependent Claims (11, 12)
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Specification