The purpose of this study was to evaluate the clinical efficacy of 128 MDCT (multi-detector computed tomography) for reducing the CareDose 4D dose and comparing the image quality with the fixed tube current technique. For this purpose, we conducted the phantom and clinical studies to evaluate the exposure dose and image of the subject before and after applying the CareDose 4D system in abdominal examination using 128 MDCT. In the phantom study, ROI (Region of interest) was located at the center, 3, 6, 9, 12 o'clock, into two groups: group A without CareDose 4D and Group B applied were measured. In the clinical study, ROI was located at the liver 8 segments, divided into two groups too. The measured items were CT number, noise, and dose length product (DLP) dose. The result of CTDIvol (CT Dose Index volume) measurements in phantom and clinical studies were lower than those before CareDose 4D application, and dose and effective dose were also measured lower (p<.05). There was no difference in CT number before and after application (p>.05). In conclusion, using CareDose 4D, we can obtain optimal image information without deteriorating image quality while reducing patient dose.

• Jin Lee(Department of International Radilogical Science, Hallym University of Graduate Studies) Corresponding Author
• Young-Joon Park(Department of Radiological Science, Cheju Halla University, Department of Medical Science, Soonchunhyang University)
• Woo-Jin Jeon(Department of Radiology, National Police Hostpital, Department of Biomedical Engineering, Chungnam National University)
• Jong-Min Seok(Department of Radiology, National Police Hostpital)