Which of the following imaging techniques involves the use of a contrast medium injected into the vein to visualize blood vessels?

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CT angiography involves the use of a contrast medium injected into the vein to visualize blood vessels. Nerve conduction studies measure the response of nerves to electrical stimulation, diagnostic ultrasound involves the use of high-frequency sound waves to create images of internal body structures, and fMRI measures changes in blood flow in the brain to visualize brain activity. None of these techniques involve the injection of a contrast medium to visualize blood vessels.

Which of the Following Imaging Techniques Involves the Use of a Contrast