Journal of the Korean Society of Radiology (한국방사선학회논문지)

The Korean Society of Radiology (한국방사선학회)
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Dose Reduction and Image Quality Assessment of the CareDose 4D Technique on Abdomen Liver Computed Tomography

복부 간 CT 검사에서 CareDose 4D 사용에 따른 선량 감소 및 화질 평가

  • Seok, Jong-Min (Department of Radiology, National Police Hostpital) ;
  • Jeon, Woo-Jin (Department of Radiology, National Police Hostpital) ;
  • Park, Young-Joon (Department of Radiological Science, Cheju Halla University) ;
  • Lee, Jin (Department of International Radilogical Science, Hallym University of Graduate Studies)
  • 석종민 (국립경찰병원 영상의학과) ;
  • 전우진 (국립경찰병원 영상의학과) ;
  • 박영준 (제주한라대학교 방사선학과) ;
  • 이진 (한림국제대학원대학교 국제방사선학과)
  • Received : 2017.04.14
  • Accepted : 2017.06.30
  • Published : 2017.06.30
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Abstract

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.

본 연구의 목적은 128 MDCT(Multi-detector computed tomography)의 CareDose 4D 선량감소 효과와 임상적 유용성을 평가하고자 시행되었다. Phantom과 임상 복부 검사 연구라는 두 가지 방법을 통해 128 MDCT CareDose 4D 시스템 적용 전후의 피사체 피폭선량과 영상 평가를 실시하였다. Phantom 연구에서는 CareDose 4D 적용 전후의 두 그룹에 대하여 중앙과 3, 6, 9, 12시의 방향으로 ROI(Region of interest)를 위치시켰고, 임상 연구에서는 간의 각 8구획에 대하여 CareDose 4D 적용 전 후 두 그룹에 대하여 ROI를 위치하여 CT Number, Noise, DLP(Dose length product)선량을 측정하였다. 측정결과 Phantom 및 임상연구에서 CT Number는 적용 전 후 값에 차이가 없었고(p>.05), 선량관련 CTDIvol(CT dose index volume) 측정값 및 유효선량은 CareDose 4D 적용 후가 낮았다 (p<.05). 결론적으로 CareDose 4D를 사용하면 영상의 화질을 저하시키지 않고 최적의 영상정보를 획득하면서 환자 선량이 감소되는 효과를 얻을 수 있다.

Keywords

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