PET-CT is a method of diagnosing and observing the efficacy of malignant tumors, which is performed after the injection of drugs into the body to understand the concentration of these drugs in the body. PET-CT is a method of diagnosing and observing the efficacy of malignant tumors, which is performed by injecting drugs into the body to find out how these drugs are concentrated in the body, and if there is abnormal uptake, it may be a malignant tumor, but if there is no abnormal uptake, it is normal. Pregnant women and children are protected by a distance of three meters from the examiner. Radionuclide usually has a half-life of six hours and its wavelength is relatively short, so the distance of damage is also very short, but it has no damaging effect on the healthy adult population. Patients are advised not to overstress, the amount of drug injected is very small, although it is some radioactive material, it will be metabolized quickly and can only affect itself through blood vessels, so normal life is sufficient.
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