title: Gyrocardiography: a new non-invasive approach in the study of mechanical motions of the heart. Concept, method and initial observations.
abstract: The pumping action of the heart is performed by contraction of the myocardium fibers. We present a non-invasive technique named gyrocardiography (GCG) that comprises a sensor of angular motion, gyroscope, configured to obtain three-dimensional angular velocity signals. A tri-axial micro electromechanical (MEMS) gyroscope sensor was attached to the surface of the chest to obtain gyrocardiogram. Color-coded Doppler tissue imaging (DTI) was recorded simultaneously and synchronized with the GCG in an off-line analysis. By placing a region of interest longitudinally around the myocardium in DTI allowed us to investigate whether GCG can provide information indicative of the tissue velocity and relative strain rate of the myocardium. Experimental observations by simultaneously recorded GCG and color DTI suggests that a gyroscope sensor attached to the chest is indeed capable to monitor the myocardial deformation during the cardiac cycle and therefore can provide a gateway to clinically relevant information.
authors.forename: Mojtaba Jafari
authors.initials: MJ
authors.lastname: Tadi
authors.forename: Eero
authors.initials: E
authors.lastname: Lehtonen
authors.forename: Mikko
authors.initials: M
authors.lastname: Pankaala
authors.forename: Antti
authors.initials: A
authors.lastname: Saraste
authors.forename: Tuija
authors.initials: T
authors.lastname: Vasankari
authors.forename: Mika
authors.initials: M
authors.lastname: Teras
authors.forename: Tero
authors.initials: T
authors.lastname: Koivisto
mesh_terms: D057791:Cardiac Imaging Techniques; D003935:Diagnostic Techniques, Cardiovascular; D015150:Echocardiography, Doppler; D006321:Heart / Q000502:physiology*; D006801:Humans; D009200:Myocardial Contraction