What is the characteristic feature of neuroimaging using PET scans?

The characteristic feature of neuroimaging using PET scans is that it assesses metabolic activity. Positron Emission Tomography (PET) is particularly valuable in studying the brain's functionality by measuring the uptake and utilization of glucose or other tracers that the brain uses for energy. This metabolic activity is indicative of neuronal function, allowing clinicians and researchers to observe how different areas of the brain are active or at rest in various physiological and pathological states.

In contrast, PET does not primarily focus on structural abnormalities, which are typically assessed using other imaging modalities such as MRI or CT scans. While PET can provide some information regarding blood flow as a metabolic indicator, it is not its primary function. Similarly, while PET can involve imaging soft tissue, the essential characteristic that distinguishes it from other imaging techniques is the assessment of metabolic processes.