Radiation Dose Reducing Effect during the AEC System in the Chest and Abdomen of the MDCT Scanning

흉부 및 복부에서 AEC 적용에 따른 MDCT의 선량 감소 효과

  • Published : 2009.03.28


The purpose of the current study was to compare radiation dose of 64MDCT performed with automatic exposure control (AEC) with manual selection fixed tube current. We evaluated the CT scans of phantom of the chest and abdomen using the fixed tube current and AEC technique. Objective image noise shown as the standard deviation of CT value in Hounsfield units was measured on the obtained images. Compared with fixed tube current, AEC resulted in reduction of the chest and abdomen in the CTDIvol (35.2%, 5.9%) and DLP (49.3%, 3.2%). Compared with manually selected fixed tube current, AEC resulted in reduced radiation dose at MDCT study of chest and abdomen.


AEC;Radiation dose;CTDI;Computed Tomography


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