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- W2499355178 abstract "Electrical I mpedance Tomography ( EIT) i s a non -invasive i maging technique which consists on placing a number of electrodes (normally 8, 16 or 32) e quidistantly a round the pe riphery of t he object t o be s tudied. O ne of t he preferred m ethods f or o btaining a pr ojection f or i mage r econstruction us es an alternating current signal injected between a p air of adjacent electrodes and the voltage developed in the periphery is measured using the rest of the electrodes. An image reconstruction algorithm is then used to produce an image or resistiv- ity map o f th e cr oss-section. The non-invasive n ature o f t he t echnique has r e- sulted i n numerous bi omedical a pplications r eported o ver t he past t hree d ec- ades. However, since EIT is a s oft-field sensing technique most of the reported works use current excitation frequencies in the alpha of low-beta frequency dis- persion ranges. In particular for breast cancer detection using biompedance in- formation, i t h as been r eported, and g enerally accep ted, t hat t umors e xhibit a significant i mpedance ch ange i n t he m id- and h igh-beta f requency di spersion ranges. T herefore, i t i s o f g reat i nterest t o increase t he cu rrent ex citation f re- quency. In addition, it is common to find that the preferred i mage reconstruc- tion methods are qualitative (i. e. Weigthed Backprojection), to benefit robust- ness and reconstruction speed, since quantitative methods are iterative, and may fail to converge when noise is present in the measured voltage signals. The au- thors pr esent a n E IT da ta a cquisition s ystem for obt aining da ta f rames us ing current excitation frequencies from the alpha- to mid-beta frequency dispersion ranges. T he eq uipment g enerates t he cu rrent ex citation s ignal b y d irect d igital synthesis that allows current excitation frequency sweeping. Thus, in effect, the equipment is an impedance spectroscopy imaging system. T he equipment was used t o o btain images of a v olunteer's t high t o a ssess t he pe rformance o f t he equipment. Images were reconstructed using qualitative (Weighted Backprojec- tion) and quantitative (Modified Newton-Raphson) image reconstruction meth- ods, a t different f requencies r anging f rom 20 0 K Hz t o 20 M Hz. Q uantitative images were in a greement with th e qualitative im ages. A s frequency i s i n-" @default.
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- W2499355178 date "2014-01-01" @default.
- W2499355178 modified "2023-09-22" @default.
- W2499355178 title "Electrical Impedance Spectroscopy imaging of the thigh using current excitation frequencies in the mid-ß frequency dispersion range." @default.
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