RADIOSURGERY
\ɹˌe͡ɪdɪə͡ʊsˈɜːd͡ʒəɹi], \ɹˌeɪdɪəʊsˈɜːdʒəɹi], \ɹ_ˌeɪ_d_ɪ__əʊ_s_ˈɜː_dʒ_ə_ɹ_i]\
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A stereotactic neurosurgery in which the usual rigid needles or probes are replaced with beams of ionizing radiation directed toward an intracranial target so as to achieve local tissue destruction. No skin incision or skull opening is required. It is performed with the "gamma knife", a self-contained unit with 201 cobalt-60 sources or with an isocentric linear accelerator (linac). (Goodman, M.L., Southern Medical Journal, vol. 83, May 1990, pp. 551-4)
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