a method for imaging a subject includes injecting the subject with a single dose of a radionuclide and acquiring , with a molecular breast imaging system , a first set of medical image data of a breast of the subject after injection of the single dose of a radionuclide . the method also includes acquiring , with a myocardial perfusion imaging system , a second set of medical image data of a portion of a cardiovascular system of the subject after the single dose of a radionuclide and reconstructing the first set of medical image data into a medical image of the breast of the subject and reconstructing the second set of medical image data into a medical image of the portion of the cardiovascular system of the subject .