Abstract
Steady effort on research of the magnetocardiogram (MCG) has been made since the introduction of SQUID gradiometer to measure weak magnetic field of the heart. 1,2 The isomagnetic map was useful to study instantaneous magnetic field of each phase of cardiac cycle like the isopotential map. However, compared with the isopotential map, few studies on MCG mapping have been made, and previous studies on the MCG did not provide us with a clear answer about whether the MCG is a clinically useful tool. In order to obtain the answer, we should study the MCG more quantitatively in clinical setting. But most of the previous studies have been theoretical ones. Our studies on the MCG mapping in the clinical cases showed that in some conditions the MCG mapping was superior to the ECG mapping. These conditions were: (1) the detection of the opposing dipoles, 3,4 (2) detection of the current source close to t e anterior chest wall, 5,6 and (3) source localization (inverse solution). 7-10 In this paper, we compared the two mapping methods based on our clinical cases, to fill a gap between the theoretical studies and clinical cardiology.
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