General Studies · Biological Psychology / Brain Imaging
Arrange the following steps in the correct chronological sequence for Positron Emission Tomography (PET) brain scanning: (1) Red indicates the highest metabolic activity, followed by yellow, green, and blue. (2) A radioactive tracer substance is injected into the bloodstream. (3) Highly active areas of the brain metabolize more blood flow and absorb the tracer. (4) Positrons emitted by the decay of the tracer are detected by the PET scanner.
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- 1(4) → (1) → (3) → (2)
- 2(1) → (2) → (4) → (3)
- 3(3) → (4) → (1) → (2)
- 4(2) → (3) → (4) → (1)✓
Correct answer
(2) → (3) → (4) → (1)
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