The use of high-frequency sound waves to record echoes on an oscilloscope and film is:
A) electroencephalography.
B) myelogram.
C) ultrasonography.
D) positron emission tomography.
C
Explanation:
A) Electroencephalography records the electrical activity of the brain.
B) A myelogram is an x-ray of the spinal cord after injecting a contrast medium.
C) Correct.
D) Positron emission tomography is a nuclear imaging procedure.
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