What is a key disadvantage of using PET scans?

• A. They are highly accurate
• B. No radiation is involved
• C. They require radioactive tracers
• D. They can only show structure

Answer: (C)

The choice of requiring radioactive tracers is a key disadvantage of using PET scans because this process involves exposure to low levels of radiation. While PET scans provide valuable information about metabolic processes and brain activity by tracking the distribution of these tracers in the body, the need for radioactive substances raises concerns regarding safety and potential health risks associated with radiation exposure.

In contrast, the other options highlight positive attributes or misconceptions. For instance, while PET scans are indeed highly accurate in detecting metabolic changes, this is not necessarily a disadvantage. The absence of radiation is not characteristic of PET scans; they inherently involve it due to the use of radioactive tracers, which are essential for their functioning. Additionally, PET scans do more than just show structure; they are primarily used to assess functional processes, offering insights into how organs and tissues are functioning rather than purely their structural anatomy.