EP2950705A1 - Method for testing plausibility - Google Patents
Method for testing plausibilityInfo
- Publication number
- EP2950705A1 EP2950705A1 EP13714538.9A EP13714538A EP2950705A1 EP 2950705 A1 EP2950705 A1 EP 2950705A1 EP 13714538 A EP13714538 A EP 13714538A EP 2950705 A1 EP2950705 A1 EP 2950705A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- determined
- impedance
- measured values
- measurement
- measurement values
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7221—Determining signal validity, reliability or quality
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/053—Measuring electrical impedance or conductance of a portion of the body
Definitions
- the invention relates to a method for checking the plausibility of electrical impedance measured values which are determined when measuring the bio-impedance of a person.
- the measurement of the electrical impedance of a person is typically carried out using a so-called body composition analyzer (BCA) to draw conclusions about the composition of the body of the person concerned.
- BCA body composition analyzer
- proportions by weight of muscle mass, bone, fat and water are determined.
- the person often takes a positioning on a measuring device and stands here with the feet each on two pairs of electrodes.
- hand-held electrodes are manually seized or contracted.
- the quality of the measured values and thus also the quality of the information about the composition of the body derived therefrom depend on a multiplicity of disturbing factors. These are, for example, the posture, the quality of the contact with the electrodes and the positioning of the electrodes relative to the body.
- the aim is to make do with the shortest possible measuring duration and, if possible, to take into account only qualitatively good measured values. With the previously known methods, this is not possible in a completely satisfactory manner.
- the object of the invention is to improve a method of the type mentioned in the introduction such that an automated plausibility of the measured values can be carried out.
- This object is achieved according to the invention in that real parts and imaginary parts of the impedance measured values are determined for a plurality of different frequencies and with respect to their local localization in a complex representation plane represented by a coordinate axis for the imaginary part and a coordinate axis for the real part is defined, are compared with a desired course and that the measured value is assessed as not plausible when exceeding a predetermined deviation from the desired course.
- the method according to the invention can be graphically illustrated by the fact that in the complex plane a desired course is represented, which reproduces for all frequencies between zero and infinity a typical positioning of the real parts and the imaginary parts of the impedance measured values. If the real part and / or the imaginary part of a specific measured value is at a distance from the point on the nominal course associated with its measuring frequency, which exceeds a maximum permissible deviation in magnitude and / or phase, the relevant measured value is not plausible.
- the intention is not to use a set course which is not invariably located in the complex number plane, but to check on the basis of the specifically determined measured values whether these lie on a curve shape which corresponds to the desired course.
- a method implementation can thus, for example, between the specifically determined Measured values are interpolated and from this the resulting curve are determined. This profile is then compared with respect to its curve shape and the frequency-dependent positioning of the individual measured values with the predetermined desired course.
- a typical process implementation is defined by using a circle segment in the complex plane as the target profile.
- the frequency is changed from a minimum value to a maximum value when carrying out the measurement.
- the minimum value is zero Hertz and the maximum value is infinity.
- at least three measured values are determined.
- Fig. 1 is an electrical equivalent circuit diagram of the human
- Fig. 3 is a locus for the electrical resistance of
- FIG. 5 shows a diagram for illustrating a comparison of present measured values with calculated values from the fit curve according to FIG. 4,
- Fig. 7 is another illustration for viewing
- Fig. 1 illustrates an electrical equivalent circuit diagram (1) for the human body in the measurement of bio-impedance.
- the equivalent circuit diagram comprises two mutually parallel branches (2, 3), wherein in the branch (2) has a resistance
- branches (2, 3) are each brought together in the region of connections (7, 8).
- the capacitor (6) is shown in the equivalent circuit diagram (1) only by way of example. In particular, it is also thought to use a so-called “Constant Phase Element” instead of the capacitor (6).
- the "Constant Phase Element” behaves much like a non-ideal capacitor.
- Fig. 2 shows the impedance of the equivalent circuit diagram (2) within the complex number plane in the form of a locus (9). It can be seen that for a DC case, and thus for a frequency of zero, the impedance has only a real part, which is determined by the resistor (4). As the frequency increases, the real part decreases and the amount of imaginary part increases first. At an infinite frequency, the magnitude of the imaginary part of the impedance is zero again and the impedance has only a real part resulting from the parallel connection of the resistors (4, 5).
- the exact semicircular locus (9) shown results in consideration of the capacitor (6) in the equivalent circuit diagram (1). If the already mentioned “Constant Phase Element” is used instead of the capacitor (1), then the locus (9) has the shape of a shorter circular section.
- the desired curve profile can be determined geometrically, for example.
- the relevant circle section is determined with the aid of three interpolation points from the series of measurements and Subsequently, a determination of the component values of the equivalent circuit diagram takes place.
- the intersection between the locus and the real axis with the greater distance to the imaginary axis corresponds to the value of the resistor (4).
- the intersection between the locus and the real axis with the smaller distance to the imaginary axis corresponds to the value of the parallel connection of the two resistors (4, 5). The values of these two resistors are defined by this.
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/DE2013/000060 WO2014117758A1 (en) | 2013-01-29 | 2013-01-29 | Method for testing plausibility |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2950705A1 true EP2950705A1 (en) | 2015-12-09 |
Family
ID=48049721
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13714538.9A Ceased EP2950705A1 (en) | 2013-01-29 | 2013-01-29 | Method for testing plausibility |
Country Status (4)
Country | Link |
---|---|
US (1) | US20150320361A1 (en) |
EP (1) | EP2950705A1 (en) |
DE (1) | DE112013006532A5 (en) |
WO (1) | WO2014117758A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015118770A1 (en) | 2015-11-03 | 2017-05-04 | Seca Ag | Combination measuring device for measuring the weight and at least one further body parameter of a subject |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5807272A (en) * | 1995-10-31 | 1998-09-15 | Worcester Polytechnic Institute | Impedance spectroscopy system for ischemia monitoring and detection |
NO20025803D0 (en) * | 2002-12-03 | 2002-12-03 | Idex Asa | Live finger |
WO2008064426A1 (en) * | 2006-11-30 | 2008-06-05 | Impedimed Limited | Measurement apparatus |
ES2549385T3 (en) * | 2008-11-10 | 2015-10-27 | Impedimed Limited | Fluid indicator |
-
2013
- 2013-01-29 EP EP13714538.9A patent/EP2950705A1/en not_active Ceased
- 2013-01-29 DE DE112013006532.0T patent/DE112013006532A5/en not_active Withdrawn
- 2013-01-29 US US14/655,410 patent/US20150320361A1/en not_active Abandoned
- 2013-01-29 WO PCT/DE2013/000060 patent/WO2014117758A1/en active Application Filing
Non-Patent Citations (2)
Title |
---|
None * |
See also references of WO2014117758A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE112013006532A5 (en) | 2016-02-25 |
US20150320361A1 (en) | 2015-11-12 |
WO2014117758A1 (en) | 2014-08-07 |
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