Extraction of Fetal Cardiac Signals from an Array of Maternal Abdominal Recordings PDF
Preview Extraction of Fetal Cardiac Signals from an Array of Maternal Abdominal Recordings
Extraction of Fetal Cardiac Signals from an Array of Maternal Abdominal Recordings RezaSameni Directedby: ChristianJutten MohammadB.Shamsollahi GIPSA-lab,INPG,Grenoble,France SharifUniversityofTechnology,Tehran,Iran July7,2008,Grenoble,France Overview 1outof125babiesarebornwithheartdefects [Mar,2005,Mininoetal.,2007,AHA,2008] Earlydetectionofcardiacabnormalitieshelpmedications andprecautionsduringdelivery Mostdefectsmanifestintheheart-rateandmorphology ofelectricalandmagneticcardiacsignals But,wedon’thavedirectaccesstothefetusandthefetal signalsrecordedfromthemother’sabdomenarevery weakwithhighinterferences NoninvasiveFetalCardiacSignalExtraction 2 Problem Definition Objective: Thenoninvasiveextractionoffetalcardiacsignalsfromanarrayof electrodesrecordedfromtheabdomenofapregnantwoman x 1 x 2 x (t) y (t) 1 1 x2(t) y2(t) xn x(t)= .. y(t)= .. . . x (t) y (t) n m x 3 Noisyobservationsignals Processedsignals x 4 Asetofelectricor magneticrecordings NoninvasiveFetalCardiacSignalExtraction 3 Outline 1 Background 2 StateoftheArt 3 Methods AnECGModelingandDenoisingFramework LinearMultichannelECGProcessing PeriodicComponentAnalysis SubspaceDecompositionbyDeflation 4 ConclusionandPerspectives NoninvasiveFetalCardiacSignalExtraction 4 Background Outline 1 Background 2 StateoftheArt 3 Methods AnECGModelingandDenoisingFramework LinearMultichannelECGProcessing PeriodicComponentAnalysis SubspaceDecompositionbyDeflation 4 ConclusionandPerspectives NoninvasiveFetalCardiacSignalExtraction 5 Background The Electrocardiogram Electrocardiogram(ECG):Overallelectricalactivityoftheheartrecorded fromthebodysurface R R R R TheR-peaksoftheECGareusedtoextracttheheart-beat NoninvasiveFetalCardiacSignalExtraction 6 Background What is the Vectorcardiogram? Vectorcardiogram(VCG):A3DrepresentationoftheECG, reconstructedfrom3ECGleads VCGoforthogonalECGleadsgivedipoleapproximationsforbody surfacepotentials: φ(t)≈a s (t)+a s (t)+a s (t) 1 1 2 2 3 3 NoninvasiveFetalCardiacSignalExtraction 7 StateoftheArt Outline 1 Background 2 StateoftheArt 3 Methods AnECGModelingandDenoisingFramework LinearMultichannelECGProcessing PeriodicComponentAnalysis SubspaceDecompositionbyDeflation 4 ConclusionandPerspectives NoninvasiveFetalCardiacSignalExtraction 8 StateoftheArt History of Fetal Electrocardiography 1906: M.CremerobservedthefetalECGusingstringgalvanometers [Cremer,1906] 1950’s: Improvementsinmeasurementandamplificationtechniques [Lindsley,1942] 1970’s: Introductionofsignalprocessingtechniquesinthisdomain [Farvet,1968,Widrowetal.,1975] 1990’s: Applicationofmultichannelsignalprocessinginthisdomain [vanOosterom,1986,Kanjilaletal.,1997,Zarzosoetal.,1997] Theproblemhassincebeenconsideredinbiomedicalandsignal processingcommunities.... NoninvasiveFetalCardiacSignalExtraction 9 StateoftheArt Objectives Fetalheart-rateanalysis[Wakai,2004] FetalECGmorphologyanalysis NoninvasiveFetalCardiacSignalExtraction 10
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