Electrical impedance tomography

Figure 1: A cross section of a human thorax from an X-ray CT showing current stream lines and equi-potentials from drive electrodes. Note how lines are bent by the change in conductivity between different organs.[1]

In this prototype, the electrodes are attached around a grapefruit which represents a child's head. Liquid is injected into the grapefruit to mimic brain haemorrhage.

Adhesive electrodes on chest of a 10 day old neonatal experimental subject [37]

EIT reconstruction (left) and impedance change over six breaths, from.[37] Data available on [38]

Electrical Impedance Tomography (EIT) is a non-invasive medical imaging technique in which an image of the conductivity or permittivity of part of the body is inferred from surface electrode measurements. Electrical conductivity depends on free ion content and differs considerably between various biological tissues (absolute EIT) or different functional states of one and the same tissue or organ (relative or functional EIT). The majority of EIT systems apply small alternating currents at a single frequency, however, some EIT systems use multiple frequencies to better differentiate between normal and suspected abnormal tissue within the same organ (multifrequency-EIT or electrical impedance spectroscopy).

单词	Electrical impedance tomography
释义	Electrical impedance tomography 英语百科 Electrical impedance tomography Electrical Impedance Tomography (EIT) is a non-invasive medical imaging technique in which an image of the conductivity or permittivity of part of the body is inferred from surface electrode measurements. Electrical conductivity depends on free ion content and differs considerably between various biological tissues (absolute EIT) or different functional states of one and the same tissue or organ (relative or functional EIT). The majority of EIT systems apply small alternating currents at a single frequency, however, some EIT systems use multiple frequencies to better differentiate between normal and suspected abnormal tissue within the same organ (multifrequency-EIT or electrical impedance spectroscopy).
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