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http://dx.doi.org/10.7742/jksr.2017.11.6.453

Evaluation of Radiation Dose and Image Quality according to CT Table Height  

Lee, Jongwoong (Department of Radiology Kyung Hee University Hospital)
Jung, Hongmoon (Department of Radiological Science Daegu Health College)
Publication Information
Journal of the Korean Society of Radiology / v.11, no.6, 2017 , pp. 453-458 More about this Journal
Abstract
Computed Tomography (CT) provides information on the Diagnostic Reference Level Computed Tomography Dose Index (CTDI) and Dose Length Product (DLP) for accurate diagnosis of patients. However, it does not provide a dose change according to the table height for the diagnostic reference level provided by the CT equipment. The purpose of this study was to evaluate the image and dose according to the table height change using phantom (PMMA: Polymethyl Methacrylate) in order to find the optimal image and the minimum dose during computed tomography examination. When examining using a 32 cm PMMA phantom with the same thickness as the abdomen of an adult, there was little change in dose with table height. However, the noise evaluation of the image caused a high fluctuation of noise depending on the table height. and in the case of the 16 cm PMMA phantom, the change of the noise was small, but the dose change was about 30%. In conclusion, the location of the patient and the center of the detector are important during computed tomography (CT) examinations. In addition, table height setting is considered to be important for examinations with optimized image and minimum dose.
Keywords
CT radiation dose; CT table height dose; CT patient thickness dose;
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