1. A system comprising: an imaging system comprising: a gamma camera that emits gamma rays to record a gamma image of a field of view including a portion of a patient's body, wherein the gamma camera comprises a collimator; an optical imaging modality that emits optical rays to record an optical image of the field of view including the portion of the patient's body; and a display device to display the an enhanced gamma image of the field of view that illustrates a characteristic of a disease in the field of view, wherein the enhanced gamma image is created based on a function of the optical image.