a positron emission tomography (PET) scan is an imaging test that allows your doctor to check for diseases in your body. The scan uses a special dye containing radioactive tracers. These tracers are either swallowed, inhaled, or injected into a vein in your arm depending on what part of the body is being examined
Caffeine is usually not dangerous when used carefully. Depressants are a group of drugs that slow down the activity in the brain and body. and coffee helps you stay awake.
