RESOLUTION ENHANCEMENT OF BIOMAGNETIC IMAGES USING THE METHOD OF ALTERNATING PROTECTIONS

Resolution of biomagnetic images using the technique of the alternatin g projections is proposed. Our image reconstruction procedure is divid ed in two steps. First, the biomagnetic inverse problem is solved by u se of the projection theorem to reconstruct an initial image of the cu rrent distribution from a given magnetic field profile. Although the c urrent distribution thus obtained has poor resolution, it can resemble the original shape of the current distribution. The second step impro ves the resolution of the reconstructed image by using the method of a lternating projections. The procedure assumes that images can be repre sented by line like elements and involves finding the line like elemen ts based on the initial image and projecting back onto the original so lution space. Simulation studies were performed on a set of parallel c onductors and a shape of the conductors in the form of letters, UWB@. All conductors were of line like thickness. Restored images closely re semble the original shape of the conductors.