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Removal of interference from fetal MEG by frequency dependent subtraction

J. Vrba, J. McCubbin, R.B. Govindan, S. Vairavan, P. Murphy, H. Preissl, C.L. Lowery, H. Eswaran
2012 NeuroImage  
SUBTR was found to perform well in simulations and on real fMEG recordings, and has a potential to improve the detection of fetal brain signals.  ...  Fetal magnetoencephalography (fMEG) recordings are contaminated by maternal and fetal magnetocardiography (MCG) signals and by other biological and environmental interference.  ...  MATERIALS AND METHODS OP Fetal MEG recording is contaminated by maternal and fetal MCG (mMCG and fMCG).  ... 
doi:10.1016/j.neuroimage.2011.08.103 pmid:21930216 pmcid:PMC3254788 fatcat:uri23nymefei3gdcf5wjwsmu6u

Quantification of fetal magnetoencephalographic activity in low-risk fetuses using burst duration and interburst interval

Srinivasan Vairavan, Rathinaswamy B. Govindan, Naim Haddad, Hubert Preissl, Curtis L. Lowery, Eric Siegel, Hari Eswaran
2014 Clinical Neurophysiology  
Methods-Spontaneous MEG brain activity was examined in 22 low-risk fetal recordings with gestational age (GA) ranging from 30-37 weeks.  ...  Objective-To identify quantitative MEG indices of spontaneous brain activity for fetal neurological maturation in normal pregnancies and examine the effect of fetal state on these indices.  ...  Acknowledgments This study was supported by grants from the National Institutes of Health (NIH) R01EB007826 and 5R01NS036277-03, USA, and Hubert Preissl was supported by DFG (TR-SFB 654).  ... 
doi:10.1016/j.clinph.2013.11.018 pmid:24361251 pmcid:PMC4035423 fatcat:huu3ijpghbbwhef7geojiuvi4m

Fetal MEG evoked response latency from beamformer with random field theory

J. McCubbin, J. Vrba, P. Murphy, J. Temple, H. Eswaran, C.L. Lowery, H. Preissl
2010 NeuroImage  
Analysis of fetal magnetoencephalographic brain recordings is restricted by low signal to noise ratio (SNR) and non-stationarity of the sources.  ...  There was at least one significant response for 62% of fetal and 95% of newborn recordings with gestational age (GA) between 28 and 45 weeks from 29 subjects.  ...  In previous work an 'actogram' was used to identify fetal movement based on MCG variations and then select segments with relatively stable MCG.  ... 
doi:10.1016/j.neuroimage.2009.08.019 pmid:19686855 pmcid:PMC2764827 fatcat:6g5n7fklhbebrphvt4gzuz3b34

Validation of the flash-evoked response from fetal MEG

J McCubbin, P Murphy, H Eswaran, H Preissl, T Yee, S E Robinson, J Vrba
2007 Physics in Medicine and Biology  
These results confirm that the combined application of a beamformer model search and bootstrap significance test provides a validation of the flash-evoked response observed in OP processed fetal MEG channels  ...  Flash-evoked responses can be recorded from the fetus in utero.  ...  Acknowledgements The work was supported by the US National Institutes of Health under grants 1R01NS367704A1 and 1R33EB00978-01.  ... 
doi:10.1088/0031-9155/52/19/005 pmid:17881801 pmcid:PMC2600492 fatcat:3rlumkhntnfozntpinzsy3cgze

Selection of Reference Channels Based on Mutual Information for Frequency-Dependent Subtraction Method Applied to Fetal Biomagnetic Signals

D. Escalona-Vargas, E. R. Siegel, P. Murphy, C. L. Lowery, H. Eswaran
2017 IEEE Transactions on Biomedical Engineering  
Fetal magnetoencephalography (fMEG) recordings are measured in the presence of maternal (mMCG) and fetal (fMCG) magnetocardiograms, and other biological and environmental interferences.  ...  We measured the performance of SUBTR at removing mMCG and fMCG signals in two steps for different number of references in 38 real datasets. The evaluation was based on MCG amplitude reduction.  ...  National Institute of Health (NIH) under Grant NIBIB/1R01EB07826.  ... 
doi:10.1109/tbme.2016.2591443 pmid:27416588 pmcid:PMC5541937 fatcat:fi2azny4gbev5pwy65w43kalui

Magnetocardiography measurements with 4He vector optically pumped magnetometers at room temperature

S Morales, M C Corsi, W Fourcault, F Bertrand, G Cauffet, C Gobbo, F Alcouffe, F Lenouvel, M Le Prado, F Berger, G Vanzetto, E Labyt
2017 Physics in Medicine and Biology  
In this paper, we present a proof of concept study which demonstrates for the first time the possibility to record magnetocardiography (MCG) signals with 4 He vector optically-pumped magnetometers (OPM  ...  MCG signals from a phantom and two healthy subjects are successfully recorded.  ...  In parallel, future work will concentrate on designing an OPM array dedicated to multichannel MCG/MEG recordings enabling mapping approaches. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17  ... 
doi:10.1088/1361-6560/aa6459 pmid:28257003 fatcat:sg6v6utshrbozdcy42fgpll4xu

Toward noninvasive monitoring of ongoing electrical activity of human uterus and fetal heart and brain

S. Lew, M.S. Hämäläinen, Y. Okada
2017 Clinical Neurophysiology  
Svenja Knappe of the University of Colorado Boulder and Dr. Vishal Shah of QuSpin, inc, Louisville, CO, for the information on the opti- Conflict of interest None.  ...  of any FM scanner as it is the case for any MEG or MCG measurements.  ...  recording bandwidth of 25 Hz).  ... 
doi:10.1016/j.clinph.2017.08.026 pmid:29100065 pmcid:PMC5697525 fatcat:f5xoervlljhlzfht6n2h32cwbu

Model-based Bayesian filtering of cardiac contaminants from biomedical recordings

R Sameni, M B Shamsollahi, C Jutten
2008 Physiological Measurement  
as the EEG, EMG, and also for canceling maternal cardiac signals from fetal ECG/MCG.  ...  In this paper, it is shown that this framework may be effectively used for removing cardiac contaminants such as the ECG, MCG, and ballistocardiographic artifacts from different biomedical recordings such  ...  Dirk Hoyer from the Biomagnetic Center of the Department of Neurology, Friedrich Schiller University, Jena, Germany, for providing the MCG recordings, and Dr.  ... 
doi:10.1088/0967-3334/29/5/006 pmid:18460766 fatcat:ca6obhcz6rg47ipu7muspvqgfy

SQUIDs in biomagnetism: a roadmap towards improved healthcare

Rainer Körber, Jan-Hendrik Storm, Hugh Seton, Jyrki P Mäkelä, Ritva Paetau, Lauri Parkkonen, Christoph Pfeiffer, Bushra Riaz, Justin F Schneiderman, Hui Dong, Seong-min Hwang, Lixing You (+17 others)
2016 Superconductors Science and Technology  
Subsequently, in 1970 , Cohen et al (1970 reported the recording of a magnetocardiogram using a Superconducting QUantum Interference Device (SQUID).  ...  will make MEG systems more accessible.  ...  Various attempts have been made to commercialize multichannel SQUID arrays for biomagnetic applications such as MEG or adult and fetal MCG (see, e.g., [83] ).  ... 
doi:10.1088/0953-2048/29/11/113001 fatcat:q5ux5ojuz5ewtdewd6ibq2bxgu

Characterizing atomic magnetic gradiometers for fetal magnetocardiography

I. A. Sulai, Z. J. DeLand, M. D. Bulatowicz, C. P. Wahl, R. T. Wakai, T. G. Walker
2019 Review of Scientific Instruments  
As an application, we consider the problem of fetal magnetocardiography (fMCG) detection in the presence of a large background maternal MCG signal.  ...  It allows for optimally setting the measurement baseline and for quickly assessing the advantage, if any, of performing a measurement in a gradiometric mode.  ...  Finally, in section IV, we consider the problem of detecting fetal magneto-cardiography (fMCG) in the presence of the large maternal MCG signal.  ... 
doi:10.1063/1.5091007 pmid:31472627 pmcid:PMC6690843 fatcat:3jo3eyo6q5a7tcnoifu3aovz6y

Cervical Ripening and Labor Induction: A Current Review

Hamid Hadi, Charles Hodson
2007 Journal of the Islamic Medical Association of North America  
In this revlew, we present cellular and biochemical events in cervk:aI ripeJling and discuss the indications and contralndlcatlons of labor l!  ...  When performed with an unripe cervix, it results in prolonged labor, potential medical compliad:ions, and an increased rate of cesarean seclio:o.  ...  The incidence of tachysystole is reduced by 5096 when the 25 meg instead of the 50 meg misoprostol regimen is used for cervical ripening.  ... 
doi:10.5915/39-1-5251 fatcat:44wzz3u43jhrtfrdiuk2uaz7lm

Current Status and Future of Cardiac Mapping in Atrial Fibrillation [chapter]

Doosang Kim, Hyuk Ah
2012 Atrial Fibrillation - Basic Research and Clinical Applications  
Therefore, in order to manage AF successfully, we should get detailed information of AF activity in atrium using a high sensitive mapping methodology.  ...  AF is a major concern in general population worldwide.  ...  Fetal MCG recordings are another important application of magnetic measurements to detect the heart rate of the fetus and even some cardiac abnormalities throughout the course of pregnancy [61] , because  ... 
doi:10.5772/25905 fatcat:236gdkknjrbhbezj7qbxvhg55a

A pilot study: Auditory steady-state responses (ASSR) can be measured in human fetuses using fetal magnetoencephalography (fMEG)

Dorothea Niepel, Bhargavi Krishna, Eric R. Siegel, Rossitza Draganova, Hubert Preissl, Rathinaswamy B. Govindan, Hari Eswaran, Emanuele Bartolini
2020 PLoS ONE  
Analysis of the included 37 fetal recordings revealed a statistically significant response for the phase coherence between trials for the MF of 27 Hz but not for 42 Hz.  ...  In conclusion, this pilot study is the first description of a method to detect human ASSRs in fetuses. The findings warrant further investigations of the developing fetal brain.  ...  Acknowledgments We thank the team of the SARA lab for recruiting and the subjects and maintaining the SARA device. We also gratefully thank all women for their participation.  ... 
doi:10.1371/journal.pone.0235310 pmid:32697776 fatcat:72bmo6wprjat7coondzk5bdjsm

A pilot Study: Auditory Steady-State Responses (ASSR) can be measured in human Fetuses using fetal Magnetoencephalography (fMEG) [article]

Dorothea M Niepel, Bhargavi Krishna, Eric R Siegel, Rossitza Draganova, Hubert Preissl, Rathinaswamy B Govindan, Hari Eswaran
2019 bioRxiv   pre-print
Analysis of the included 37 fetal recordings revealed a statistically significant response for the phase coherence between trials for the MF of 27 Hz but not for 42 Hz.  ...  In conclusion, with the present study it was possible to detect human fetal ASSRs for the first time. These findings warrant further investigations of the developing fetal brain.  ...  Acknowledgements We thank the team of the SARA lab for recruiting and the subjects and maintaining the SARA device. We also gratefully thank all women for their participation. Bibliography  ... 
doi:10.1101/610303 fatcat:uddkwaeodncvfpcfvo7pdtg4sq

Whole-Head Magnetoencephalogram and Its Application in Developmental Communication Disorders Research: A Review

Aimin Liang, Huanqi Wu, Yuyu Ma, Xiaoyu Liang, Yifan Jia, Yang Gao, Xiaolin Ning, Jiancheng Fang
2021 IEEE Access  
Although it has been widely recognized in cognitive and clinical neuroscience, the application of MEG in studies of the typical and atypical development of the brain in the early stage of life is still  ...  Thus, MEG recordings are technically feasible for infants and children over seven years old who are experiencing remarkable changes in brain maturation, as long as they can stay reasonably well during  ...  In addition, they used traditional MEG instead of pediatric MEG, which may not have been optimal for the detection of the children's neuromagnetic fields. In the follow-up study by Sowman et al.  ... 
doi:10.1109/access.2021.3063054 fatcat:g6kxmogxgvbzhp5ydc3m7fytyy
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