The Potter-Bucky diaphragm.
HAUPT
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D000009:Abdominal Muscles; D003964:Diaphragm; D007049:Iatrogenic Disease; D008416:Mastoid / Q000000981:diagnostic imaging*; D009141:Musculoskeletal System; D011859:Radiography / Q000295:instrumentation*; D013679:Technology, Radiologic / Q000295:instrumentation*