Gastric functional monitoring by gastric electrical impedance tomography (gEIT) suit with dual-step fuzzy clustering

Abstract

Abstract Gastric Function has been successfully estimated by gastric electrical impedance tomography ( g EIT) Suit with dual-step fuzzy clustering. The g EIT Suit which are made of elastic cloth with dual-planar electrodes and compact data acquisition (DAQ) system measures gastric impedance Z to visualize the gastric conductivity distribution σ. The dual-step fuzzy clustering extracts the clustered gastric conductivity distribution k σ, which accurately estimates the gastric function . The g EIT Suit with dual-step fuzzy clustering are applied to eight healthy persons during liquid meal consumption to estimate the gastric function under gastric accommodation phase of 200, 400 and 600 mL based on the gastric emptying phase. As the results, the g EIT Suit successfully estimate the gastric function. By the measured impedance Z, the subjects have a mean temporal impedance $$\overline{\Delta \mathbf{Z} }$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mover> <mml:mrow> <mml:mi>Δ</mml:mi> <mml:mi>Z</mml:mi> </mml:mrow> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> = − 9.27 [Ohm] and p -value of that $$\overline{\mathbf{Z} }$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mover> <mml:mi>Z</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> p ( Z ) = 0.0013[–]as the t-test result. In the case of gastric conductivity distribution σ, the subjects have a value of spatial mean conductivity distribution ⟨σ⟩ = 0.23[–] and p -value of that ⟨σ⟩ p (σ) = 0.0140[–]. Lastly, in the case gastric volume V , subjects have a gastric volume V = 12.44 [%] and p -value p ( V ) = 0.0664[–].