The radioactive isotope (radiotracer) accumulates in areas where there is a high level of chemical or metabolic activity – these are called ‘hot spots’.
Hot spots can be used to identify uncontrolled over-production of cells caused by cancer.
If there is reduced activity in areas of your body, there will be lower amounts of radiotracer.
These ‘cold spots’ can be used to identify organs, glands or other parts of your body that are not functioning properly.
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