Which of Following Statements Most Accurately Describes a PET Scan

Which of following statements most accurately describes a PET scan?

A) A procedure used to examine the blood vessels
B) A procedure used to examine the spinal cord
C) An imaging procedure that uses radiation to produce cross sections of the brain
D) An imaging technique that produces an image of the brain using sound waves sent through the skull
E) Inserting a needle into the lumbar region of the spine in order to collect spinal fluid