摘 要:該文章給出了CT劑量指數(CTDI)的定義、以及在臨床醫學和設備質量控制方面的應用。并對多排螺旋CT中CT劑量指數的物理意義作了特別說明。重點討論了CT劑量指數(CTDI)的測量原理、方法等相關技術,并且比較了國際電工委員會(IEC)和美國食品藥品監督管理局(FDA)關于CT劑量指數(CTDI)的定義及計算方法的差異,使讀者了解CT劑量指數(CTDI)發展和演變。 關鍵詞:CT;CTDI;劑量指數;測量;質量控制 中圖分類號:TH774 文獻標識碼:A 文章編號:1672-4984(2007)04-0033-04 Research and measurement on CT dose index GUO Hong-tao1, LIU Yong2, YUAN Shu-hua3 (1.Beijig Institute of Metrology and Testing,Beijing 100013,China; 2.TOSHBA Sanguang Medical Corporation,Beijing 100102,China; 3.Beijing Hospital,Beijing 100730,China) Abstract: This article introduces the definition and expression of the computed tomography dose index (CTDI), the application in the clinical medicine and medicinal equipments testing, especially emphasized the physical meaning of CTDI for Spiro Scanning Computer Tomography and the its measurement. The author also compared the definition of CTDI and the computational formulas used in the CTDI measurement of International Electrotechnical Commission (IEC) and American Food and Drug Administration (FDA) and explained the evolution and evolvement of CTDI.
Key words: Computer tomography; CTDI; Dose index; Measurement; QC