Event Abstract Back to Event Detection of Fetal Movement using Spatio-Temporal Magnetocardiogram Rathinaswamy Govindan1*, Srinivasan Vairavan2, Umit Ulusar3, Hubert Preissl4, 5, Pam Murphy1 and Curtis Lowery1 1 University of Arkansas for Medical Sciences, Department of Obstetrics and Gynaecology, United States 2 University of Arkansas at Little Rock, United States 3 University of Arkansas at Little Rock, Graduate Institute of Technology, United States 4 University of Tuebingen, MEG-Center,University Hospital, Germany 5 University of Arkansas, Department for Obstetrics and Gynecology, Medical College, United States Fetal movement is used to understand the behavioral states and thereby the maturation of the fetus. Wakai proposed an approach to track fetal movement by studying the variation of the amplitude of the R-wave, (a major component of a cardiogram) over time. This technique is called the actocardiogram. However, if the fetus is located far away from the sensors, the variation in the R-wave amplitude is small and hence fetal movement cannot be reliably captured. Here we propose a novel approach to fetal movement detection using the spatio-temporal magnetocardiogram recorded by a 151 SQUID sensor system. Through signal space projection we attenuate the maternal cardiac signals. Using an adaptive Hilbert transform approach we identify the R-markers . At a given R-marker, we define center of gravity (COG) as the product of the sensor coordinates with their corresponding magnitude of the R amplitude and normalize this quantity by the sum of the magnitude of R amplitudes from all the sensors. Using this procedure we compute COG at all R-points and compute the average value (ave-COG) of all COGs. To define the actocardiogram, we compute the distance between COG obtained at each R-point and the ave-COG. By applying this procedure to our data, we show that the actocardiogram displays accelerations whenever there is acceleration in the fetal heart rate. To this end, for the movements identified by this approach, we calculate their duration and study its variation with gestational age. R.T. Wakai, Assessment of fetal neurodevelopment via fetal magnetocardiography, Exp. Neurology, 190; S65-71, 2004. U. D. Ulusar, R.B. Govindan, J. D. Wilson, C. L. Lowery, H. Preissl, H. Eswaran, Adaptive rule based fetal QRS complex detection using Hilbert transform, IEEE EMBS 2009, Minneapolis, MN, USA: , p. T23. Conference: Biomag 2010 - 17th International Conference on Biomagnetism , Dubrovnik, Croatia, 28 Mar - 1 Apr, 2010. Presentation Type: Poster Presentation Topic: Fetal and neonatal biomagnetism Citation: Govindan R, Vairavan S, Ulusar U, Preissl H, Murphy P and Lowery C (2010). Detection of Fetal Movement using Spatio-Temporal Magnetocardiogram. Front. Neurosci. Conference Abstract: Biomag 2010 - 17th International Conference on Biomagnetism . doi: 10.3389/conf.fnins.2010.06.00167 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 26 Mar 2010; Published Online: 26 Mar 2010. * Correspondence: Rathinaswamy Govindan, University of Arkansas for Medical Sciences, Department of Obstetrics and Gynaecology, Little Rock, United States, RBGovindan@uams.edu Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Rathinaswamy Govindan Srinivasan Vairavan Umit Ulusar Hubert Preissl Pam Murphy Curtis Lowery Google Rathinaswamy Govindan Srinivasan Vairavan Umit Ulusar Hubert Preissl Pam Murphy Curtis Lowery Google Scholar Rathinaswamy Govindan Srinivasan Vairavan Umit Ulusar Hubert Preissl Pam Murphy Curtis Lowery PubMed Rathinaswamy Govindan Srinivasan Vairavan Umit Ulusar Hubert Preissl Pam Murphy Curtis Lowery Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.