Impedance Parameter Values
First Claim
1. ) A method of determining parameter values used in impedance analysis of a subject, the method including, in a processing system:
- a) determining a number of impedance measurements at a corresponding number of frequencies;
b) determining estimates of the parameter values;
c) determining theoretical impedance values based on the parameter value estimates;
d) comparing the theoretical impedance values to the measured impedance values;
e) determining at least one modification direction for at least one of the parameter value estimates in accordance with the results of the comparison; and
,f) modifying at least one parameter value estimate in accordance with the determined direction, the parameter values being determined at least in part from one or more modified parameter value estimates.
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Accused Products
Abstract
A method of determining parameter values used in impedance analysis of a subject. The method includes using a processing system to determine a number of impedance measurements at a corresponding number of frequencies. The impedance measurements are used to determine estimates of parameter values, with the estimates being used to determine theoretical impedance values based on the parameter value estimates. The theoretical impedance values are compared to the measured impedance values to allow a modification direction to be determined for at least one of the parameter value estimates. This is then used to modify at least one parameter value estimate, with the parameter values being determined at least in part from one or more modified parameter value estimates.
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Citations
24 Claims
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1. ) A method of determining parameter values used in impedance analysis of a subject, the method including, in a processing system:
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a) determining a number of impedance measurements at a corresponding number of frequencies; b) determining estimates of the parameter values; c) determining theoretical impedance values based on the parameter value estimates; d) comparing the theoretical impedance values to the measured impedance values; e) determining at least one modification direction for at least one of the parameter value estimates in accordance with the results of the comparison; and
,f) modifying at least one parameter value estimate in accordance with the determined direction, the parameter values being determined at least in part from one or more modified parameter value estimates. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. ) Apparatus for determining parameter values used in impedance analysis of a subject, the apparatus including a processing system for:
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a) determining a number of impedance measurements at a corresponding number of frequencies; b) determining estimates of the parameter values; c) determining theoretical impedance values based on the parameter value estimates; d) comparing the theoretical impedance values to the measured impedance values; e) determining at least one modification direction for at least one of the parameter value estimates in accordance with the results of the comparison; and
,f) modifying the at least one parameter value estimate in accordance with the determined direction. - View Dependent Claims (20, 21)
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22. ) (canceled)
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23. ) A method of diagnosing the presence, absence or degree of one or more conditions in a subject, the method including, in a processing system:
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a) determining a number of impedance measurements at a corresponding number of frequencies; b) determining estimates of the parameter values; c) determining theoretical impedance values based on the parameter value estimates; d) comparing the theoretical impedance values to the measured impedance values; e) determining at least one modification direction for at least one of the parameter value estimates in accordance with the results of the comparison; f) modifying at least one parameter value estimate in accordance with the determined direction, the parameter values being determined at least in part from one or more modified parameter value estimates; and
,g) using the determined parameter values in diagnosing the presence, absence or degree of one or more conditions in the subject.
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24. ) An apparatus for determining parameter values used in impedance analysis of a subject, the apparatus comprising:
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a) means for determining a number of impedance measurements at a corresponding number of frequencies; b) means for determining estimates of the parameter values; c) means for determining theoretical impedance values based on the parameter value estimates; d) means for comparing the theoretical impedance values to the measured impedance values; e) means for determining at least one modification direction for at least one of the parameter value estimates in accordance with the results of the comparison; and
,f) means for modifying at least one parameter value estimate in accordance with the determined direction, the parameter values being determined at least in part from one or more modified parameter value estimates.
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Specification