1. A method of generating a multi-modality anatomical atlas, the method comprising: receiving first and second medical images of a region-of-interest (ROI) of a same individual, the first and second medical images being acquired by different first and second imaging modalities; generating first and second feature images based on the first and second medical images, the first and second feature images including a same designated anatomical feature of the ROI; determining a transformation function by registering the first and second feature images; applying the transformation function to the first and second medical images to register the medical images; and generating a multi-modality anatomical atlas, the multi-modality anatomical atlas including the first and second medical images, wherein the first and second medical images are first and second reference images, the multi-modality anatomical atlas including an organ model that corresponds to an organ in the ROI.