Question

Positron emission tomography (PET) is one of the best methods for functional imaging because

• A. Isotopes of basic body elements are used for imaging.
• B. Isotopes with long half-lives are used.
• C. Isotopes with short half-lives are used.
• D. Positrons are directly involved used in imaging.

Answer 1

The correct option is A Isotopes of basic body elements are used for imaging.

PET or positron emission tomography is a nuclear medicine, functional imaging technique that produces a three-dimensional image of functional processes in the body.
The system detects pairs of gamma rays emitted indirectly by a positron-emitting radionuclide which is introduced into the body on a biologically active molecule. To conduct the scan, a short-lived radioactive tracer isotope is injected into the living subject.
Therefore, the correct answer is option A.