Impedance measurement process
First Claim
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1. Apparatus for use in performing impedance measurements on a subject, the apparatus comprising:
- a) an electrode array having a number of electrodes configured to form a rectangular array;
b) a signal generator for generating signals to be applied to the subject using drive electrodes of the array;
c) a sensor for determining measured signals induced across the subject using measurement electrodes of the array;
d) a switching device coupled to the electrode array; and
,e) a processing system that controls the switching device to selectively interconnect the signal generator and the sensor to the selected ones of the electrodes, which therefore function as drive and measurement electrodes, the processing system configured to control the switching device to;
cause a first measurement to be performed at a first site using first and second electrodes as drive electrodes and using third and fourth electrodes as measurement electrodes;
cause a second measurement to be performed at the first site using first and third electrodes as drive electrodes and using second and fourth electrodes as measurement electrodes;
determine a presence, absence or degree of an anomaly at the first site using the first and second measurements;
cause a third measurement to be performed at a second site using third and fifth electrodes as drive electrodes and using fourth and sixth electrodes as measurement electrodes;
cause a fourth measurement to be performed at the second site using third and fourth electrodes as drive electrodes and using fifth and sixth electrodes as measurement electrodes; and
determine a presence, absence or degree of an anomaly at the second site using the third and fourth measurements.
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Abstract
A method for use in performing impedance measurements on a subject. The method includes, in a processing system, determining at least one first impedance value, measured at a site using a first electrode configuration, determining at least one second impedance value, measured at the site using a second electrode configuration, and determining the presence, absence or degree of an anomaly using the first and second impedance values.
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Citations
21 Claims
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1. Apparatus for use in performing impedance measurements on a subject, the apparatus comprising:
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a) an electrode array having a number of electrodes configured to form a rectangular array; b) a signal generator for generating signals to be applied to the subject using drive electrodes of the array; c) a sensor for determining measured signals induced across the subject using measurement electrodes of the array; d) a switching device coupled to the electrode array; and
,e) a processing system that controls the switching device to selectively interconnect the signal generator and the sensor to the selected ones of the electrodes, which therefore function as drive and measurement electrodes, the processing system configured to control the switching device to; cause a first measurement to be performed at a first site using first and second electrodes as drive electrodes and using third and fourth electrodes as measurement electrodes; cause a second measurement to be performed at the first site using first and third electrodes as drive electrodes and using second and fourth electrodes as measurement electrodes; determine a presence, absence or degree of an anomaly at the first site using the first and second measurements; cause a third measurement to be performed at a second site using third and fifth electrodes as drive electrodes and using fourth and sixth electrodes as measurement electrodes; cause a fourth measurement to be performed at the second site using third and fourth electrodes as drive electrodes and using fifth and sixth electrodes as measurement electrodes; and determine a presence, absence or degree of an anomaly at the second site using the third and fourth measurements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification