Title :
Magnetic source imaging within the human heart from simulated and measured MCG data
Author :
Tilg, B. ; Wach, P.
Author_Institution :
Dept. of Biophys., Graz Univ. of Technol., Austria
Abstract :
A reconstruction algorithm of the minimum-norm least-square (MNLS) type in order to locate focal and distributed electrical sources simultaneously within the human heart is presented. Reconstruction is applied to simulated and measured magnetocardiograms (MCGs). Synthetic MCG data are generated in the forward problem using a computer model of the entire human heart (cellular automaton) embedded in a standard boundary element (BE) thorax model. Real world MCG data are measured for a normal subject with the Magnes system (BTi, Inc., San Diego) by two antiparallel SQUID-probes on the anterior and posterior side of the human thorax. Isoparametric quadrilateral 8-node BEs are used for BE modeling. Reconstructions are demonstrated from measured MCG data during atrial and ventricular depolarization
Keywords :
boundary-elements methods; cellular automata; digital simulation; image reconstruction; magnetocardiography; medical image processing; Magnes system; antiparallel SQUID-probes; atrial depolarization; boundary element thorax model; cellular automaton; computer model; distributed electrical sources; focal electrical sources; forward problem; human heart; isoparametric quadrilateral 8-node boundary elements; magnetic source imaging; measured MCG data; minimum-norm least-square type algorithm; reconstruction algorithm; ventricular depolarization; Bioelectric phenomena; Biomedical measurements; Electric potential; Heart; Humans; Image reconstruction; Magnetic field measurement; Magnetic flux; Spatial resolution; Superconducting magnets;
Conference_Titel :
Computers in Cardiology 1995
Conference_Location :
Vienna
Print_ISBN :
0-7803-3053-6
DOI :
10.1109/CIC.1995.482559
