Abstract
The paper presents a morphological study of real-time magnetocardiograms (MCGs) of a normal subject. The MCGs were measured by using a 3-D second-order gradiometer connected to three rf-SQUIDs in a prefabricated magnetically shielded room. The base line of the detecting coil for Bz is 2.8 cm and that of the coil for Bx and By is 1.4 cm. The magnetic field components perpendicular to the chest (Bz component) and tangential to the chest (Bx, By components) were studied. From isofleld contour maps and arrow maps of the QRS wave of the MCG, when multiple sources exist simultaneously, we can infer the locations and positions of different sources by combining the Bz component with the Bx and By components. The analyzed results showed that a method using of a 3-D second-order gradiometer that we developed is useful for discriminating the directions and locations of multiple sources.
