Imaging ventilation and perfusion using Electrical Impedance Tomography

Date: November 4th, 2021

Speaker: Dr. David Isaacson

Affiliation: Rensselaer Polytechnic Institute

Title: Imaging ventilation and perfusion using Electrical Impedance Tomography

Abstract: Electrical Impedance Tomography systems apply patterns of electrical currents to an array of electrodes on a subjects chest. They measure the resulting voltages. From this data they reconstruct and display real time images of the interior electrical conductivity and permittivity inside the chest. Mathematically this is an inverse boundary value problem for Maxwell’s Equations.

Since lungs filled with air , or depleted of blood, have lower conductivity, than lungs depleted of air or filled with blood, movies of the conductivity distribution can show the changes in volumes of air and blood in the lungs during ventilation and perfusion.

The mathematical basis for this technology will briefly be explained. Movies and images will be shown of ventilation and perfusion , and images of a ventilation perfusion index within each lung will be shown.