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Evaluation of the performance of the Multifrequency Electrical Impedance Tomography (MFEIT) intended for imaging acute stroke

Romsauerova, A; McEwan, A; Fabrizi, L; Holder, DS; (2007) Evaluation of the performance of the Multifrequency Electrical Impedance Tomography (MFEIT) intended for imaging acute stroke. In: Scharfetter, H and Merwa, R, (eds.) 13TH INTERNATIONAL CONFERENCE ON ELECTRICAL BIOIMPEDANCE AND THE 8TH CONFERENCE ON ELECTRICAL IMPEDANCE TOMOGRAPHY 2007. (pp. 543 - 547). SPRINGER

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Abstract

MEEIT (Multi-Frequency Electrical Impedance Tomography) could be used to distinguish between ischaemic and haemorrhagic stroke and permit the urgent use of throm -bolytic drugs in patients with acute stroke. The UCLH Mk2.5 comprises a single impedance measuring circuit multiplexed to 32 electrodes which can record from 20 Hz; to 1.6 MHz. The purpose of this study was to test its performance in liquid filled tanks with resistive or complex backgrounds, with a view to image stroke. Cylinders of banana, potato and gel, 20% of the diameter of a cylindrical or head shaped tank with real human skull were imaged using time difference or linear frequency difference reconstruction algorithms. The UCLH Mk2.5 worked well: both reconstructed images and derived impedance spectra in tanks with the uniform background of 0.1% NaCl saline corresponded closely to direct impedance measurements. With a complex background of pieces of carrot in 0. 1% NaCl saline, frequency difference reconstruction of gel and potato was successful in the cylindrical 2D tank, but not the head shaped 3D tank. At present, it appears that the accuracy across the frequency of the UCLH Mk2.5 is not sufficient to the smaller frequency difference changes in the head shaped tank and further calibration studies are in progress to improve this. The spectral properties of the mixture of saline and carrot and potato obtained from the 2D tank were respectively suitable as test objects for normal and ischaemic brain.

Type: Proceedings paper
Title: Evaluation of the performance of the Multifrequency Electrical Impedance Tomography (MFEIT) intended for imaging acute stroke
Event: 13th International Conference on Electrical Bioimpedance/8th Conference on Electrical Impedance Tomography
Location: Graz, AUSTRIA
Dates: 2007-08-29 - 2007-09-02
ISBN-13: 978-3-540-73840-4
Keywords: MFEIT, complex background, uniform background, stroke
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Neuro, Physiology and Pharmacology
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng
URI: http://discovery.ucl.ac.uk/id/eprint/121544
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