PET scans also show the functions or non-functions of brain activity, basically how active the brain is working. Researchers can compare images of healthy brains to the patients with mental diseases so that they can better understand the different diseases that have an impact on brain activity. PET scans show what parts of the brain work when a person is doing different activities such as reading, eating, memorizing, walking or even the emotions of getting scared. Fluorine-18 makes these scans work because of its long half-life.
You can use PET scans to monitor the effectiveness of treatments for a disease.
A whole-body PET scan image using 18F-FDG
Source:
http://www.google.com/imgres?q=pet+scans+fluorine-18&um=1&hl=en&sa=N&biw=1496&bih=868&tbm=isch&tbnid=YK9qHjGvfg9EEM:&imgrefurl=http://sitemaker.umich.edu/pet.chemistry/positron_emission_tomography&docid=5RY0H9JFNTs3dM&imgurl=http://sitemaker.umich.edu/pet.chemistry/files/fdg.jpg&w=340&h=280&ei=CY6EUJaHKor29gSV6IDoDQ&zoom=1&iact=rc&dur=175&sig=111680760797274087944&page=1&tbnh=149&tbnw=182&start=0&ndsp=34&ved=1t:429,r:7,s:0,i:92&tx=108&ty=75
http://en.wikipedia.org/wiki/Positron_emission_tomography
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