In general, angiography refers to visualization of the blood vessels (whether arteries or veins) using a dye under a special x-ray machine. Virtually, it is a term used when arteries are visualized. There is what is known as a venous phase, where after injecting the dye into the arteries going to a certain organ, the veins that are draining the blood coming out of this organ will show the dye but weakly.
Venography refers to visualization of veins. The dye is injected into the veins directly with very good visualization to diagnose any diseases of the veins such as blood clots.
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