title: Standard template of adult magnetocardiogram.
abstract: BACKGROUND
  We need to know the magnetocardiogram (MCG) features regarding waveform and two-dimensional current distribution in normal subjects in order to classify the abnormal waveform in patients with heart disease. However, a standard MCG waveform has not been produced yet, therefore, we have first made the standard template MCG waveform.
  
  
  RESULTS
  We used data from 464 normal control subjects' 64-channel MCGs (268 males, 196 females) to produce a template MCG waveform. The measured data were averaged after shortening or lengthening and normalization. The time interval and amplitude of the averaged data were adjusted to mean values obtained from a database. Furthermore, the current distributions (current arrow maps [CAMs]) were calculated from the produced templates to determine the current distribution pattern. The produced template of the QRS complex had a typical shape in six regions that we defined (M1, M2, M3, M4, M5, and M6). In the P wave, the main current arrow in CAMs pointing in a lower-left direction appeared in M1. In the QRS complex, the typical wave appeared in each region, and there were two main current arrows in M2 and M5. There were negative T waves in M1, M4, and M5, and positive T waves in M3 and M6, and the main current arrow pointing in a lower-left direction appeared in M2.
  
  
  CONCLUSIONS
  Template MCG waveforms were produced. These morphologic features were classified into six regions, and the current distribution was characterized in each region. Consequently, the templates and classifications enable understanding MCG features and writing clinical reports.
authors.affiliation: Advanced Research Laboratory, Hitachi, Ltd., Higashi-Koigakubo, Kokubunji, Tokyo, Japan.
authors.forename: Akihiko
authors.initials: A
authors.lastname: Kandori
authors.forename: Kuniomi
authors.initials: K
authors.lastname: Ogata
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Miyashita
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Watanabe
authors.forename: Kimio
authors.initials: K
authors.lastname: Tanaka
authors.forename: Masahiro
authors.initials: M
authors.lastname: Murakami
authors.forename: Yuji
authors.initials: Y
authors.lastname: Oka
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Takaki
authors.forename: Syuji
authors.initials: S
authors.lastname: Hashimoto
authors.forename: Yuko
authors.initials: Y
authors.lastname: Yamada
authors.forename: Kazuo
authors.initials: K
authors.lastname: Komamura
authors.forename: Wataru
authors.initials: W
authors.lastname: Shimizu
authors.forename: Shiro
authors.initials: S
authors.lastname: Kamakura
authors.forename: Shigeyuki
authors.initials: S
authors.lastname: Watanabe
authors.forename: Iwao
authors.initials: I
authors.lastname: Yamaguchi
mesh_terms: D000328:Adult; D004562:Electrocardiography; D005260:Female; D006801:Humans; D053798:Magnetocardiography / Q000379:methods; D008297:Male; D008875:Middle Aged; D012016:Reference Values