How Does a PET Scan Work?

How Does a PET Scan Work?


A PET scan creates 3-D images of the body.
It does this by using radioactive tracers, which are usually administered to a patient
through intravenous injection. The tracers are made up of carrier molecules that are
tightly bonded to a radioactive atom, called an isotope. The carrier molecule can interact
with or bind to specific proteins or sugars in the body. The carrier molecule that will
be used depends on what the doctor is looking for. If she suspects cancer, or is monitoring
a known cancer’s growth, she may use FDG, a modified form of glucose, which gets absorbed
by tissues. When tissues absorb a lot of glucose, it may indicate a cancerous tumor. The radiation
from the tracers poses little danger to the patient since they quickly pass out of the
body. The isotope produces small particles called positrons, which interact with surrounding
electrons. This interaction results in the complete annihilation of both particles, releasing
two photons that speed off in opposite directions. The detectors in the PET scanner measure these
photons and use this information to create an image of the distribution of FDG in the
body.

47 comments / Add your comment below

  1. If you would like child-friendly, fun to watch and easy to understand patient educational material please visit http://youtu.be/PkHV4AWqNFg 

  2. Seems like if we got rid of sugars, cancer wouldnt have anything to live off of.
    And these scans are causing cancer to grow, by feeding it sugar.
    Very stupid doctors.. now I know why they have repeat customers. ( patients)

  3. This is what comes to mind when people say humans are stupid. Those people are projecting. Humans are clearly not stupid. Just..most of us are.

  4. Nuclear Medicine Industry Present Scenario and the Growth Prospects with Forecast 2024

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    The global nuclear medicine market has gained sustainable growth owing to increasing number of new cancer and cardiovascular cases, since nuclear medicines are used as a diagnostic tool for these diseases. Continuing research and studies demonstrating positive results is widening the scope of radioisotope applications for the diagnosis and treatment of bone diseases, respiratory diseases, thyroid-related diseases, and conditions of the digestive tract.

  5. Einstein's famous equation, E=mc^2 is wrong otherwise garbage also can be used to make nuclear bombs as long as it is matter or it has mass. Energy and matter can't interchange one another according to Einstein's famous equation. One must have photons before one can emit out  photons. Photons are particles and they have mass. All forms of EMWs are dynamic photons per volume per time in different saturations. Generally, when a matter meets with its counterpart anti-matter annihilation may or may not take place provided either the matter or the anti-matter or both are saturated with photons in the first place because Einstein's famous equation is not true. We suspect the metabolism of the radioactive glucose will dissipate out  sufficient heat to be detected by PET scanner in diagnosing cancerous condition of a patient. Positrons are rather rare on earth. In addition, only anti-neutron within the nucleus of a anti-matter radioisotope may undergo positron emission by ejecting its positrons to the surroundings. PET scanner seemed like detecting photons rather than positrons. The whole idea of how PET scanner works has been misunderstood completely. If you are interested in real discoveries, I would recommend you to read my book, The Unification Theory – Volume One and you will be amazed with lots of new, interesting discoveries. In God I trust.

  6. So, since cancer must have lots of sugar to spread and grow, it takes up the molecule attached to sugar much faster than regular tissue? It almost seems that if someone cut their sugar intake if might make their body much less enticing for cancer growth.

  7. she sayd LITTLE DANGER since it goes fast out of the body but what is little then?? what can happen? am having an panic attack here becaus enext week i have to do an pet scan jesusz

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