Signal Space Separation Method for a Biomagnetic Sensor Array Arranged on a Flat Plane for Magnetocardiographic Applications: A Computer Simulation Study

Figure 7

(a) Plots of the mean signal gain , the noise gain , and their ratio versus the z coordinate of the origin z_ori. The signal sensor data were computed by setting the signal source at one of the voxel locations, and the signal gain G_S was obtained. The mean signal gain was computed by averaging G_S obtained from all voxel locations. (b) The mean interference gain versus z_ori. The plot with the broken line shows the case , and the plot with the solid line shows the case . The interference data b _I were computed by setting a source at 100 equally spaced locations on the surface of a sphere with a radius of , and the interference gain was obtained. The mean interference gain was computed by averaging obtained from all 100 source locations. The sphere with a radius is shown in the upper part.

(a)

(b)