title: A multipurpose CT-guided stereotactic instrument of simple design.
abstract: The instrument is based upon a radiolucent ring fixed to the skull by four pins. This locks into a frame for CT scanning from which the x, y and z stereotactic coordinates are derived. The head ring may be locked into a compatible support on the operating table for biopsy. A similar support and localization system is used for rotational radiotherapy. With the current 14 MeV apparatus, fields as small as 2 cm in diameter are available with 90% dosage fall-off in the surrounding 1-cm shell.
mesh_terms: D001706:Biopsy / Q000295:instrumentation; D001921:Brain / Q000473:pathology; D001927:Brain Diseases / Q000532:radiotherapy / Q000601:surgery*; D001931:Brain Mapping / Q000295:instrumentation; D004567:Electrodes, Implanted; D006801:Humans; D013238:Stereotaxic Techniques / Q000295:instrumentation*; D014057:Tomography, X-Ray Computed / Q000295:instrumentation*