1. A method for correcting fat-induced aberrations in ultrasound imaging, the method comprising: reconstructing a thermoacoustic absorption image of a region of interest using an assumed speed of sound value; segmenting the thermoacoustic absorption image into at least one region containing fatty tissue and at least one region containing lean tissue; creating a speed of sound map by assigning a speed of sound value to each region, the assigned speed of sound value being dependent on an amount of fatty tissue within that region; correcting aberrations for each region in the segmented thermoacoustic absorption image using a ratio of the assigned speed of sound value to the assumed speed of sound value, thereby generating a corrected thermoacoustic image; and correcting an ultrasound image of the region of interest using the corrected thermoacoustic image and the speed of sound map.