| abstract |
A computerized method of determining the slow wave of a gastrointestinal tract comprising the steps of providing an ingestible capsule ( 20 ) having a pressure sensor ( 29 ), having a subject ingest the capsule, recording measurements from the pressure sensor as the capsule passes through the gastrointestinal tract of the subject, transmitting the measurements to a processor ( 31 ), conditioning the measurements ( 42 ) to provide pressure data as a function of a time interval ( 60 ), interpolating missing pressure data in the time interval ( 43 ), filtering the pressure data as a function of a desired bandpass ( 44 ), differencing the pressure data ( 45 ), windowing the pressure data ( 46 ), applying a sample size and an overlap between samples to segment the pressure data ( 47 ), applying a Fourier transform to the segmented pressure data to provide frequency pressure data ( 48 ), selecting an FFT frequency bandpass ( 49 ), computing power spectrum density of the transformed pressure data for the FFT bandpass ( 50 ), and plotting the transformed pressure data ( 53 ), whereby a dominate pressure frequency ( 70 ) correlating to a slow wave of at least a portion of the gastrointestinal tract is provided. |