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Angiography/Angiogram
Technique that shows up blood vessels on an X-ray. It is done by injecting X-ray dye (contrast) into the blood vessel. An angiogram is a picture of one or more blood vessels which are filled with X-ray dye. Angiography usually refers to arteries; venography is the study of veins using X-ray dye.
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Arteriogram
An X-ray of an artery after the injection of dye.
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Artery
Vessels that carry blood away from the heart.
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Arthrography, Arthrogram
The visualization of a joint by X-ray after the injection of dye into the joint.
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Artifact
In radiology, something artificial that appears on a medical image but is not a part of the living tissue being examined. The image distortion could be due to an obstruction, such as a surgical metal clip, or to a problem with the imaging equipment.
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Aspirate, aspiration
Withdrawal of a fluid from the body by suction, usually through a needle or syringe.