Method and device for assessing the quality of a measurement of the electrical impedance in tissue

摘要

A device for assessing the quality of a measurement of the electrical impedance in tissue of a subject, wherein the tissue is skin, the device comprising: a unit (21) of impedance signal, arranged to obtain impedance data a area of ​​tissue of said subject tissue, said data comprising at least one measured impedance value in said region of tissue; a unit (22) for evaluation, arranged to apply an algorithm (10) evaluation data obtained impedance, so the quality of impedance data obtained are evaluated, the evaluation algorithm comprising: a part (11) preprocessing, configured to reduce the peaks and / or background noise data obtained impedance, so adjusted impedance data are obtained; a prefilter (12), configured to determine whether the impedance data set are not physiological and to reject data not physiological impedance by comparing the impedance data set with a predetermined interval of impedance data, in which they reject data that is outside that range; a filter (13) for acral skin, configured to determine whether data adjusted impedance were obtained from acral skin and to reject the impedance data showing properties typical acral skin; and a main classifier (14), configured to reject or approve data set impedance based on a plurality of parameters, including at least one parameter of the group consisting of the variation of the magnitude, phase variation, the absolute value the magnitude, the absolute value of the phase, the asymmetry of magnitude, asymmetry and phase variation of the position of the maximum phase, wherein if the prefilter (12), the filter (13) for skin acral or main classifier (14) rejects the impedance data of a measurement, it is judged that the measurement quality is poor, and if any between the prefilter (12), the filter (13) for acral skin or master sorter (14) rejects the impedance data of a measurement, it is judged that the quality of the measurement is of good quality; and a unit (23) display, arranged to display the evaluated quality of impedance data, such that it can take a decision on whether to use the impedance data to diagnose a condition of the tissue of the subject.