In medicine terms the difference between angiography and venography

is that angiography is a medical imaging technique in which an X-ray image is taken to visualize the inside of blood vessels and organs of the body, with particular interest in the arteries, veins and the heart chambers while venography is a diagnostic procedure in which an X-ray of the veins, a venogram, is taken after a special dye is injected into the bone marrow or veins.