Tomography) could distinguish between ischaemic and haemorrhagic stroke and permit the urgent use of thrombolytic drugs in patients with acute stroke. Two systems have been designed for this purpose: the IIRC EIT comprises a single multiplexed current source and 16 parallel recording channels and the UCLH Mk2.5 is similar but with a single impedance measuring circuit multiplexed to 16 electrodes. They record from 10 Hz to 500 kHz and 20 Hz to 1.6 MHz, respectively. The purpose of this study was to compare their performance in saline filled tanks, with a view to eventual use in acute stroke. Cylinders of banana, and potato, 20 % of the diameter of a saline filled spherical tank, 10 cm in diameter, were imaged using time difference at different frequencies. Performance of the two systems was similar: both reconstructed images and derived impedance spectra corresponded closely to direct measurements. The spectral properties of banana and potato were respectively suitable as test objects for normal and ischaemic brain
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