Patent ID: 9149225
Filing Date: 2015-10-06
Classification: A61B

Abstract:
1. A method of non-invasively determining lung wetness, the method comprising: placing a sensor comprising a plurality of electrodes arranged in a proximal to distal active region on the subject's back so that the proximal to distal axis of the sensor extends cranially to caudally along the subject's back, and wherein the active region of the sensor is positioned lateral to the subject's spine; using the sensor to determine a relative spatial change in subsurface resistivities across frequencies (RSCSRAF) based on applied currents and detected voltages, wherein determining the RSCSRAF comprises normalizing a resistivity at a first frequency within a first subsurface region by a resistivity at a second frequency within the first subsurface region; and indicating if the lung is wet based on the relative spatial change in subsurface resistivities across frequencies, wherein the relative spatial change in subsurface resistivities across frequencies is determined using an inverse problem to solve for the spatial distribution of subsurface resistivities by minimizing the error between detected values and those produced by a forward model calculating a change in subsurface resistivities.