An individual is admitted to the hospital to investigate a recently discovered abdominal mass. To determine the metabolic rate of the mass, an imaging study is ordered, during which a radioisotope is injected into the patient's bloodstream. This study is
. Computed tomographic (CT) scan
B. Functional magnetic resonance image (fMRI)
C. Diffusion tensor image (DTI)
D. PET scan
ANS: D
Rationale: A PET scan is a nuclear imaging study in which emissions from a radioactive compound are examined to assess blood flow, oxygenation, glucose metabolism, and/or receptor location. Techniques such as CT, DTI, and fMRI rely on the use of x-ray images, radio waves, or magnetic fields.
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