What is a PET-CT scan?
A PET-CT scan is an advanced imaging study that combines two different technologies in a single device:
PET (Positron Emission Tomography) - images the metabolic (functional) activity of tissues.
CT (Computed Tomography) - provides a precise anatomical image of the body's structure.
In combination, these technologies allow physicians to see not only what organs look like, but how they are functioning, and to pinpoint the location of disease sites with maximum precision.
What advantage does this scan have over other imaging studies?
The significant advantage is the ability to detect changes in the function of cells. Because many diseases are characterized by a change in metabolic activity before any structural change of the organ occurs, PET-CT can identify disease sites at a far earlier stage than standard imaging techniques.
How is the scan performed?
The scan consists of three main stages:
-
Injection: The patient is injected with a small, personalized dose of a radioactive substance (the tracer). This amount is considered safe.
-
Waiting period: Following the injection, the patient waits approximately one hour. This time is necessary to allow the tracer to be optimally absorbed by the body's tissues.
-
Scanning: The patient lies inside the PET-CT scanner. The camera detects the radiation emitted by the tracer in the body and translates it into an image that reflects metabolic activity.
Is the tracer dangerous?
No. The scan uses a very small amount of radioactive material that has been individually tailored to each patient to ensure their safety while achieving precise results.
What is the role of CT in the combined scanner?
While the PET camera identifies the suspicious “activity,” the CT provides the anatomical map. Together, they enable the medical staff to determine the precise location of disease sites and characterize them optimally. |