title: An iso-integral mapping technique using magnetocardiogram, and its possible use for diagnosis of ischemic heart disease.
abstract: We have developed an iso-integral mapping technique that uses magneto-cardiogram (MCG) data to obtain a map as projected total current image on the torso from the heart. We have also investigated the applicability of iso-integral mapping to the diagnosis of ischemic heart disease. We simulated and measured the characteristics of two types of iso-integral maps: one using tangential (Bxy) components, and one using the normal component (Bz). Each vector component was measured by two types of superconducting quantum interference device (SQUID) system to determine the tangential and normal components. The tangential component of the magnetic field appeared to be equivalent to the current image in the myocardium projected on the observing plane, and we were able to obtain a projected total current image by integration of the tangential components during the depolarization and repolarization processes. And we found that the iso-integral maps of normal hearts showed similar pattern in both processes; however, those of ischemic hearts showed different patterns.
authors.affiliation: Hitachi Ltd., Central Research Laboratory, Kokubunji, Tokyo, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Tsukada
authors.forename: T
authors.initials: T
authors.lastname: Miyashita
authors.forename: A
authors.initials: A
authors.lastname: Kandori
authors.forename: T
authors.initials: T
authors.lastname: Mitsui
authors.forename: Y
authors.initials: Y
authors.lastname: Terada
authors.forename: M
authors.initials: M
authors.lastname: Sato
authors.forename: J
authors.initials: J
authors.lastname: Shiono
authors.forename: H
authors.initials: H
authors.lastname: Horigome
authors.forename: S
authors.initials: S
authors.lastname: Yamada
authors.forename: I
authors.initials: I
authors.lastname: Yamaguchi
mesh_terms: D000200:Action Potentials; D018780:Body Surface Potential Mapping / Q000379:methods*; D017097:Electric Impedance; D004562:Electrocardiography / Q000379:methods*; D004574:Electromagnetic Fields; D006801:Humans; D008280:Magnetics; D017202:Myocardial Ischemia / Q000175:diagnosis*; D012680:Sensitivity and Specificity