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J Korean Soc Radiol. 2014 Sep;71(3):128-131. English. Original Article. https://doi.org/10.3348/jksr.2014.71.3.128
Park JH , Choo KS , Jeon UB , Baik SK , Kim YW , Kim TU , Kim CW , Jeong DW , Lim SJ .
Department of Radiology, Research Institute for Convergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital, Pusan National University School of Medicine, Yangsan, Korea. kschoo0618@naver.com
Department of Radiology, Pusan National University Hospital, Pusan National University School of Medicine, Busan, Korea.
Department of Family Medicine, Pusan National University Yangsan Hospital, Pusan National University School of Medicine, Yangsan, Korea.
Department of Cardiology, Gim Hae Jungang Hospital, Gimhae, Korea.
Abstract

PURPOSE: The objective of this study is to compare image quality and radiation dose of high pitch (3) CT angiography (CTA) with 128-slice dual-source CT in lower extremity arteries with that of low pitch (0.6) CTA. MATERIALS AND METHODS: A total of 136 patients were divided into two groups; high pitch (3) group included 67 patients and low pitch (0.6) group included 69 patients. For quantitative analysis, we calculated the mean arterial attenuation, mean coefficient variation of arterial attenuations, mean contrast-to-noise ratio, mean figure of merit (FOM), and mean standard deviation of CT density of muscle. In addition, visual scores were used for qualitative evaluation, and radiation doses were reported in the two groups. RESULTS: The mean dose-length product was decreased by 31% at high pitch (409.49 +/- 37.71 mGy.cm vs. 592.98 +/- 59.69 mGy.cm), and the mean volume CT dose index was also significantly decreased at high pitch (2.91 +/- 0.14 mGy vs. 4.70 +/- 0.30 mGy). However, other quantitative analysis showed no significant intergroup differences, except in mean FOM. Visual scores showed no significant intergroup difference. CONCLUSION: Despite changing the pitch from 0.6 to 3, the image quality of CTA was not degraded and radiation dose was reduced by 31%.

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