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PET Scan (Positron Emission Tomography)

PET Scan

A brain imaging technique that uses radioactive tracers to observe brain activity and metabolism in real time. It shows how the brain is actually working at any given moment.

Details

What Is a PET Scan (Positron Emission Tomography)?

A PET scan is a functional brain imaging technique that involves injecting a small amount of a radioactive tracer into the body, then capturing how that substance is distributed and metabolized in the brain. What makes it special is that it reveals the brain's activity and function — not just its structure.

How a PET Scan Works

A radioactive tracer (commonly FDG, which is glucose tagged with a radioactive substance) travels through the bloodstream to the brain. Regions of the brain that are more active consume more glucose. The positrons emitted in this process collide with nearby electrons, releasing gamma rays, which the PET scanner detects to create a 3D map of brain activity.

What a PET Scan Can Reveal

  • Metabolic activity in the brain: Which regions are highly active and which are underactive
  • Neurotransmitter systems: The distribution and function of dopamine and serotonin receptors
  • Neurodegenerative disease diagnosis: Early detection of changes associated with Alzheimer's disease
  • Drug effects: How a therapeutic medication acts within the brain

    • PET Scans and Mental Health Research

    PET scans have deepened our understanding of mental health:

  • Depression: Patterns of reduced frontal lobe metabolism and overactivation of the amygdala have been confirmed
  • Anxiety disorders: Abnormal activation patterns in specific brain regions have been observed
  • Addiction: Changes in the reward circuit (dopamine system) can be directly visualized
  • Tracking treatment effects: Changes in brain activity before and after psychotherapy can be objectively measured

    • Limitations of PET Scans

  • Because radioactive substances are used, repeated scanning is limited
  • Temporal resolution is lower compared to fMRI
  • Costs are high and the equipment is large

    • Brain imaging technology is a tool for understanding the biological basis of the mind, but truly caring for the mind begins with warm attention and consistent self-care. Mindy is always here to support you on that journey.

    💡 Real-Life Example

    When a person's brain is scanned with a PET scan during meditation, you can see the frontal lobe lighting up with greater activity compared to a resting state.

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    Related Terms

    도파민
    뇌영상
    전전두엽
    세로토닌

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    This content is for educational purposes and does not replace professional medical diagnosis.