Which nuclear medicine procedure uses a radioactive substance that emits positrons?
A) ultrasound
B) MRI
C) CT scan
D) PET scan
D
Explanation: A) Ultrasound uses sound waves, not positrons.
B) MRI uses magnets and radio waves, not positrons.
C) CT scan does not use positrons.
D) Correct! PET stands for positron emission tomography.
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Indicate whether the statement is true or false