1. An imaging apparatus for an object in change comprising: a magnetic resonance imaging (MRI) system having a computer, and a plurality of channels which produce corresponding images of the object in change using alternate lines of k-space, the computer combining the individual images into a composite image of the object, the MRI system acquiring alternate lines of temporally resolved data, wherein the MRI system requires at least one frame of temporally resolved data at full resolution acquired over two time frames, wherein each channel includes a coil element and a signal receiver that retains image data corresponding to a region of the object closest to the coil element, wherein the region includes at least 50% of the data, wherein the individual image from each coil element is imaged at different intensities to form a fully resolved image, and wherein the computer forms a ratio map for each channel separately using the corresponding fully resolved image.