運動負荷3-D MCGのST分節の検討

概要

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We measured three-dimensional (3D) magnetocardiograms (MCGs) of rest time (Rest MCGs) and exercise-induced MCG (ex-MCGs) using a second-order gradiometer connected to a 39-channel superconducting quantum interference device (SQUID). This system can detect the magnetic field component perpendicular to the chest (Bz) and tangential to the chest (Bx and By). Time-frequency analysis (wavelet analysis) was applied to the rest and ex-MCGs to examine the frequency distribution of the QT segment. These results were reconfirmed in a t-test. Spatial distribution of the ST segment with a power map showed a more significant change than the QRS complex (Bz and Bx components). Singular value decomposition (SVD), having a time window (48 ms) and a shift time (5 ms), was applied to both MCG data. The ST segments of both MCG data were divided into 10 intervals to examine the spatial distribution between the rest MCG and the ex-MCG in detail. We found that the Bx component showed more significant change in power maps than the Bz and By components in the ex-MCG.
社団法人日本磁気学会の論文
2008-01-01