1. A method for removing background field from a spatial region of interest in magnetic resonance imaging using magnetic susceptibility for contrast, comprising: obtaining, from a magnetic resonance imaging system, magnetic resonance imaging data using magnetic susceptibility for contrast; calculating, by a processing system, the background field by decomposing a field measured inside the spatial region of interest into a field generated by dipoles outside the spatial region of interest; and generating and outputting, by the professing system, magnetic susceptibility maps with enhanced contrast based on removing the calculated background field, wherein removing the calculated background field comprises subtracting the calculated background field from a total measured field.