Normally, with the introduction of this radiopharmaceutical (RFP), the following organs are visualized in order of decreasing accumulation level: cerebral cortex, myocardium, renal pelvis and bladder, oropharynx, stomach. RFP can accumulate in the colon, muscles of skeletal musculature, areas of brown fat accumulation. In other organs and tissues, the background accumulation of RFP is normal.Hyperfixation of RFP is observed in the cerebral cortex and myocardium as a result of an increased level of glucose metabolism in these organs. "Fluorodeoxyglucose, 18F" is a nonspecific RFP tumor tropism and accumulates in high amounts in cells of malignant tumors and metastases, due to the inherent giperglikolizom. The degree of accumulation of fluorodeoxyglucose, 18F in the cells of malignant tumors correlates with the degree of their malignancy. The drug also allows you to evaluate the effect of the treatment, because with effective treatment, the level of accumulation of the drug in tumors decreases, and when ineffectiveness - does not change or increases. Fluorodeoxyglucose, 18F protein is actively transported into cells, conveyors, where it undergoes phosphorylation to form fluorodeoxyglucose-6-phosphate, 18F, product which does not enter into further reactions, and in this form is retained in the cells of malignant tumors. In unaltered cells of tissues and organs dephosphorylation is observed with the formation of fluorodeoxyglucose, 18F, which is excreted from normal cells and can be redistributed.The best conditions for the detection of malignant tumors are created with mild hypoglycemia, achieved by fasting for 4-6 hours and with a water load (intake of 500-800 ml of water) after the administration of RFP. The patient is offered several times to empty the bladder. Fasting promotes increased uptake of glucose by cells, and the water load accelerates the removal of a label from normal tissues with urine, as a result of which the level of radioactive background and radiation load decrease. In patients with diabetes, blood glucose should be monitored prior to testing. PET-examination is carried out only under condition of normal or low blood glucose level. "Fluoro-deoxyglucose, 18F" is a cardiotropic RFP, and by its diagnostic properties is suitable for the study of glucose metabolism in the myocardium. RFP allows to assess the degree of viability of the myocardium when planning reconstructive operations in patients with ischemic heart disease and systolic dysfunction of the left ventricle, to monitor the effectiveness of myocardial treatment.