This image shows a brain tumor. The PET is very useful not only to detect a tumor when it's in the initial stages of growth, making the treatment more effective in eradicating it, but also to detect it's type, malignancy and spread, without the need to open the patient's brain to carry out a risky biopsy
PET is now being used by physicians to provide valuable information in many neurological diseases such as Alzheimer's disease, dementias, Parkinson's disease, Huntington's disease, and Down's Syndrome. It is also being extensively used in Psychiatry, because PET is very sensitive to biological brain alterations during episodes of schizophrenia, depression and other disorders.
In conclusion it has a brilliant future in medicine, psychology, psychiatry, and in the neurosciences in general, for studying the relation between structure and function.