A major drawback associated with PET scans is that
A) they are not accurate.
B) they are dangerous.
C) they take a long time to acquire data.
D) they cannot detect which brain regions are active during a task.
Answer: C
Rationale: Positron Emission Tomography (PET) scans use low levels of radioactive glucose that is injected into the blood to visualize which areas of the brain are engaged by various tasks. A drawback is that PET scans take a long time to acquire—which is a problem when you want to see moment-by-moment activity of the brain.
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