Which of the following diagnostic tests examines the blood vessels of the brain after the injection of a dye?
A) nerve conduction velocity
B) lumbar puncture
C) positron emission tomography
D) cerebral angiography
D
Explanation: Cerebral angiography is an X-ray of the blood vessels of the brain after an injection of radiopaque dye. A nerve conduction velocity test measures how fast an impulse travels along a nerve. A lumbar puncture is a puncture with a needle into the lumbar area to withdraw fluid for examination and for the injection of anesthesia. Positron emission tomography uses positively charged isotopes to image the brain's metabolically active tissue.
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