Thyroid SPECT is a type of radionuclide diagnostics that allows you to track the accumulation of a radioisotope in thyroid tissue by studying layered sections of the organ and their volumetric reconstruction. With the help of the study, zones of reduced accumulation of RFP (“cold” nodes) and foci of hyperfixation (“hot” nodes) are identified, a quantitative assessment of functioning and non-functioning thyroid parenchyma is performed. SPECT expands the possibilities of two-dimensional planar scintigraphy in the diagnosis of diseases such as retrosternal goiter, nodular formations, thyroid cancer, hypo- and hyperthyroidism, etc. Hybrid examination (combination of SPECT and CT) gives an idea not only about the functional state of the tissue, but also about the size, contours, structure, anatomical and topographic features of the gland.