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Nuclear medicine is the use of radioactive substance in diagnosis and treatment of diseases. Nuclear medicine is an imaging method that can show some diseases priorly compared to a number of methods. 

Radioactive substance and/or special compounds made of these substances are administered to the body via vein, respiration, taking orally or more specific ways by the examination in nuclear medicine. Distribution of the medicine in the body is examined by the type and location of the disease and photographs and films are taken or mathematical analysis is performed and physiological images of the organ or system examined are obtained. The disease is diagnosed based on these results.

Images taken in nuclear medicine reflect the functions of organs and functional disorders due to disease. These images are called as “scintigraphy”.

Nuclear medicine examinations are used or diagnosis, process and evaluation of response to the treatment of the disease. Diagnosis tests include scintigraphic imaging of thyroid, bone, heart, kidney and other many organs and disease. At the same time, radioactive substances are administered for treatment of thyroid diseases, tumors, inflammatory diseases and cancers involving bones.  

Films taken for imaging with these radioactive substances are called as scintigraphy in nuclear medicine. More superior 3-dimensioned images of scintigraphy are called SPECT (single photon emission computerized tomography) and PET (positron emission tomography).