Detecção de Fraturas Ósseas em Fantomas por Espectroscopia de Impedância

Giovanni  Gueler Dalvi; Pedro Bertemes Filho

doi:10.29384/rbfm.2021.v15.19849001614

Authors

Giovanni Gueler Dalvi Universidade do Estado de Santa Catarina https://orcid.org/0000-0001-7704-6523
Pedro Bertemes Filho Universidade do Estado de Santa Catarina https://orcid.org/0000-0002-5264-4874

DOI:

https://doi.org/10.29384/rbfm.2021.v15.19849001614

Keywords:

Electrical impedance spectroscopy; Biological phantom; Bone fractures.

Abstract

Most imaging diagnostic techniques for the detection of bone fractures uses equipment that emits radiation, which can be harmful to human health, even in small doses. Undoubtedly, studies are needed and new techniques are seeking towards the reduction of such x-ray exposures. The aim of this article is to develop a 3D biological phantom in order to investigate the sensitivity of detecting fractured bones by using electrical impedance spectroscopy. Also, it is investigated the effects of different electrode distance to the sensitivity of the measuring technique. Measurements were performed by a commercial Impedance Spectroscope from Zurich Instruments (model HF2IS) in the frequency range from 1 kHz to 1 MHz. Four circular electrodes (model MELCTEC) were used to connect the phantom to the HF2IS. The HF2IS was firstly calibrated by measuring a 100 Ω resistor and 1% accuracy. Both magnitude and phase calibrated vectors were calculated and then used to adjust the bone-phantom data. The results showed that the values of modulus and phase for the pure simulator and with fractured bone are very close while for the whole bone they present notable variation, mainly in frequencies above 100 kHz. It was observed that the distance between electrodes causes a small effect in the impedance modulus, whereas the phase changes are more significant at high frequency. It was also observed that impedance phase is more sensitive to electrode geometry with and without fractured bones. This might be a useful tool for don´t imaging fractures of human bones as a low cost, non-invasive and non-harmful approach human health.

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