Question

Positron emission tomography (PET) is one of the best methods for functional imaging because [AIIMS 2003]
A) Isotopes with long half -lives are used
B) Isotopes with short half -lives are used
C) Positrons are directly involved used in imaging
D) Isotopes of basic body elements are used for imaging

Answer 1

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

➡️ Isotopes of basic body elements are used for imaging

Answer 2

Answer: Option (B) is the correct answer.

Explanation:

Positron emission tomography (PET) helps in the detection of disease in a human body. It is an imaging test and in a PET scan, areas of disease are depicted as bright spots.

Generally, the isotopes used in Positron emission tomography (PET) have short half -lives because the radioisotopes which are used for diagnosis emits gamma rays which have sufficient energy to pass away from the body.

So, with a short half life, the radiation soon decays once the imaging is complete.

Thus, we can conclude that positron emission tomography (PET) is one of the best methods for functional imaging because isotopes with short half -lives are used.