1. The branch of medicine that deals with diagnostic images of anatomic structures made through the use of electromagnetic radiation or sound waves and that treats disease through the use of radioactive compounds. Radiological imaging techniques include x-rays, CT scans, PET scans, MRIs, and ultrasonograms.
2. The use of radiation for the scientific examination of material structures; radioscopy.
ra′di·o·logi·cal (-ə-lŏjĭ-kəl), ra′di·o·logic (-lŏjĭk) adj.
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