PET scanning: What is it and How Does It work?

A positron emission tomography, also called a PET scan, makes use of radiation to show activity inside the body on a cellular level. The procedure is most commonly used in neurology, cancer treatment, and cardiology.

Associated with a CT or MRI scan, this PET scan can generate multidimensional, color images of the within workings of the human body. You can easily locate Pet ct Bangalore centers or in your area. It displays not only what an organ appears like, but how it gets worked. A PET scan is usually to diagnose specific health conditions, to plan treatment, to find out how a current condition is developing, and to find out how effective a treatment is.

Have a look at some quick facts

Following are some key points about PET scans.

  • PET scans are generally used to diagnose a health situation or to track how it is growing.
  • It is used alongside a CT or MRI scans, it can display how a portion of the body is working.
  • These scans are often put to use to investigate epilepsy, cancer, Alzheimer’s disease, and heart ailment.
  • A scan is not at all painful, but patients must not consume any type of food for at least four to six hours before a scan. The patients must drink plenty of water.

How does a PET scan work?

In a PET scan, a machine notices radiation that is emitted by a radiotracer. A radiotracer made up of radioactive material that is marked to a natural chemical like glucose. Such a radiotracer is injected into the body wherein it runs to the cells that use glucose for energy.  The more energy any group of cell’s requiring, the more the radiotracer is going to build up in that location. It would show up on images that are rebuilt by a computer. The cells or any type of activity is going to be showed up as “hot spots” or that of “cold spots.” for your information the active areas are bright on a PET scan. These are called “hot spots.” in the areas where cells require less energy, the areas are going to be less bright. These are known as “cold spots.”  as compared to that of normal cells, cancer cells are absolutely active in using glucose, so a radiotracer that is made up of glucose is going to light up areas of cancer. You know a radiologist is going to examine the image generated on the computer and report the findings to a professional or doctor.

One example of a glucose-based radiotracer is fluorodeoxyglucose (FDG). In this FDG, radioactive fluoride molecules get tagged to glucose to make a radiotracer. FDG is the radiotracer most apparently used in the present time. Similarly, Instead of glucose, oxygen can also get used.

You know PET scans are a vital part of the diagnostic process in epilepsy and cancer and can straightway inform the next stage of treatment. As mentioned earlier also, PET scans often get used with CT or MRI scans to assist make a diagnosis or to get maximum data related to a health condition and the process of any treatment. Where an MRI or CT scan shows how a portion of the body appears, a PET scan can easily reveal how it is operating or functioning.


PET scanning can reveal which area of the brain the epilepsy is impacting. It can help doctors to take a decision regarding the most suitable treatment, and it can be effective if surgery is essential.

Alzheimer’s disease

PET scans can be helpful to diagnose Alzheimer’s disease.  It does so by measuring the uptake of sugar in particular parts of the brain. Brain cells that are impacted by Alzheimer’s incline to use glucose more gradually than normal cells.

Heart disease

A PET scan can really be helpful in detecting which areas of the heart have been injured or scarred, and it can be helpful in identifying circulation problems in the working of the heart. Such information can help plan treatment options for a heart ailment.


PET scans can underline or reveal the presence and stage of cancer. It also shows whether and where it has scattered and helped medical professionals decide on treatment. A PET scan can give a clue of how effective chemotherapy is working, and it can discover a recurring tumor sooner than other methods.

Medical research

It might also interest you that researchers can learn important information by making use of PET scans, mainly about the operation of the brain.

What is the difference between PET, CT, and MRI SCANS?

A CT or MRI scan can measure the size and shape of the organs in the body and tissue. However, they cannot measure how these work.

A PET scan can show how a specific organ works, but in the absence of a CT or MRI image, it might be challenging to locate the exact location of activity inside the body. It is true that if you combine a PET scan with a CT scan, it could give a better-rounded image of the situation of a patient.

A quick look into PET procedure

A PET scan is generally an outpatient procedure. Generally, the patient should not intake any food for at least four to six hours before the scan, but they must take plenty of water. They might have to evade caffeine for at minimum twenty-four hours before the scan.  The doctor will inject a tiny amount of radiotracer into a vein. The tracer might also be breathed in as a gas, consumed by mouth, or injected into an organ. Relying on which the organ is involved; it could take from thirty to ninety minutes for the radiotracer to reach the aimed part of the body.In the meantime, the patient is normally going to be asked to stay still and not speak. A few patients may be given medication to ease up.


Thus, choose the best pet CT scan center in Bangalore and go ahead with the procedure for exact evaluation of your body. It is better to get an exact picture of your health condition than to regret later on.