Electrical impedance tomography with non-stationary electrodes

Abstract

This paper explores the limitation that is imposed on the spatial resolution of electrical impedance tomographic images by the relatively low numbers of independent projections. In the present work the levels of recoverable image content are improved by attaching electrodes to a rotating central impeller. Incorporating the rotational motion of the electrode array into an optimized measurement strategy provides more independent measurements without compromising the stability of a consistently regularized inverse solution. A new measurement strategy, together with a mesh mapping algorithm, delivers improved results, in terms of the image contrast, from experiments on a small laboratory vessel. Initial findings suggest that the use of non-stationary electrodes has the potential to produce images with four times the amount of independent information over a conventional EIT measurement technique. The challenges in implementing an impeller-mounted electrode array are briefly discussed.

Absolute Reconstructions Using Rotational Electrical Impedance Tomography for Breast Cancer Imaging

“…Several recent studies ([9]–[13]) in both industrial and medical applications have explored fusing together multiple sets of data with the objective of improving image quality. These approaches have been termed EIT with non-stationary electrodes [9], scanning EIT (SEIT) ([10], [11]), rotational EIT (rEIT) [12], and rotary planar electrical impedance mammography (RPEIM) [13].…”

“…These approaches have been termed EIT with non-stationary electrodes [9], scanning EIT (SEIT) ([10], [11]), rotational EIT (rEIT) [12], and rotary planar electrical impedance mammography (RPEIM) [13]. SEIT has been applied to rotating electrodes in a tank [10] and to translating electrodes across a surface [11].…”

Spatial resolution in electrical impedance tomography: A topical review

“…According to Murphy and York [19], to increase the number of independent observations for EIT, a method of rotation using a mixing impeller is used. Studies show that when the current driving electrodes are attached to the impeller blades, the central sensitivity will be improved and an increased number of independent measuring positions is achieved.…”

Non-invasive process tomography in chemical mixtures – A review

“…Soft-field tomography means that the sensitivity of the medium imaged depends on the distribution of the measured parameter in the whole volume [34]. Alternatively, it will cause a challenge in solving the inverse problem of the medium of interest.…”