Procedure for measurement of conductivity in vivo for develop an anatomic atlas for electric impedance tomography. / Procedimento de medida de condutividade in vivo para desenvolver um atlas anatômico de tomografia por impedância elétrica.

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

07/06/2010

RESUMO

This paper presents a procedure for measuring conductivity in biological tissues of swine chests in vivo. This will allow an increase of resolution in images of EIT, describing the probability of occurrence in such images in a population sample. The EIT is a recently developed technique for obtaining medical images and monitoring biological tissues. Given the measured electrical potentials in a body boundary and current injected inside it, this technique estimates the distribution of conductivity inside such body. The experimental conductivity data in tissues of swine chests are used to compose an anatomical atlas, used as a regularization of EIT inverse problem. Biological tissues are conductive and their electrical properties, like conductivity and permittivity, may change depending on the physiological state. Certain biological tissue states are associated with changes in physical structure or ionic composition and may be dependent by changes in tissues passive electrical properties. These changes in electrical properties can be functional medical images. The animals used for the experiments have weight between 25 and 30 kg. These measurements are performed using an impedance analyzer and an experimental conductivimeter with 125 kHz of frequency.

ASSUNTO(S)

biological tissue conductivity condutivímetro electrical impedance impedância elétrica tecidos biológicos tomografia tomography

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