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• W4285227566 abstract "We propose a gastric electrical impedance tomography ( <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>${g}$ </tex-math></inline-formula> EIT) scheme that uses a 3D full Jacobian matrix <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$^ast text{J}$ </tex-math></inline-formula> and dual-step fuzzy clustering post-processing to automatically extract the gastric content volume <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>${V}$ </tex-math></inline-formula> . <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>${g}$ </tex-math></inline-formula> EIT has two stages: (i) computation of the full 3D Jacobian matrix <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$^ast text{J}$ </tex-math></inline-formula> , including all combinations of the current injection pattern <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>${I}$ </tex-math></inline-formula> and the impedance measurement <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>${Z}$ </tex-math></inline-formula> , in order to reconstruct the volumetric abdomen conductivity <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$sigma $ </tex-math></inline-formula> ; and (ii) clustering of the gastric composition <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$^{k} sigma $ </tex-math></inline-formula> (gastric wall <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>${k}={1}$ </tex-math></inline-formula> , gastric content <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>${k}={2}$ </tex-math></inline-formula> ) using dual-step fuzzy clustering post-processing, in order to automatically extract the volumetric gastric conductivity <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$^{k} sigma $ </tex-math></inline-formula> . Our <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>${g}$ </tex-math></inline-formula> EIT scheme is qualitatively evaluated using realistic abdomen phantoms representing three gastric accommodation phases, based on three different values for the gastric content volume filled with liquid meal: (A) <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>${V}_{A} = {100}$ </tex-math></inline-formula> mL; (B) <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>${V}_{B} = {300}$ </tex-math></inline-formula> mL; and (C) <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>${V}_{C} = {600}$ </tex-math></inline-formula> mL, for two abdomen shapes (a normal abdomen <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>${S}$ </tex-math></inline-formula> and a fatty abdomen <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>${L}$ </tex-math></inline-formula> ) through both simulation and experimental studies. The results show that <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>${g}$ </tex-math></inline-formula> EIT automatically estimates <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>${V}$ </tex-math></inline-formula> with a total mean volume error <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$langle widetilde {V}_{e}rangle $ </tex-math></inline-formula> that is 65.14% lower than a standard adjacent method. At the same time, <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>${g}$ </tex-math></inline-formula> EIT detects the gastric conductivity <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$sigma $ </tex-math></inline-formula> more effectively, with a total mean conductivity error <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$langle widetilde {textit {CE}} rangle $ </tex-math></inline-formula> and total mean root mean square error <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$langle widetilde {textit {rmse}}rangle ~33.68$ </tex-math></inline-formula> % and 25.53% lower than a standard adjacent method, respectively." @default.
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• W4285227566 date "2022-07-15" @default.
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• W4285227566 title "Gastric Electrical Impedance Tomography (gEIT) Based on a 3D Jacobian Matrix and Dual-Step Fuzzy Clustering Post-Processing" @default.
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