Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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The clinical usefulness of 64 channel MDCT and 128 channel DSCT in coronary CT angiography

관상동맥 전산화단층촬영에서 64 channel MDCT와 128 channel DSCT의 임상 유용성 평가

  • Choi, Nam-Gil (Department of Radiology, Chonnam National University Hospital) ;
  • Choi, Jae-Seong (Department of Radiology, Chonnam National University Hospital) ;
  • Han, Jae-Bok (Department of Radiology, Dongshin university)
  • 최남길 (전남대학교병원 영상의과) ;
  • 최재성 (전남대학교병원 영상의과) ;
  • 한재복 (동신대학교 방사선학과)
  • Received : 2010.10.13
  • Accepted : 2010.11.19
  • Published : 2010.11.30
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Abstract

This study was retrospectively to compare the exposure dose and the imaging quality in coronary CT angiography by using the 64 channel multidetector computed tomography and the 128 channel DSCT. Effective dose was calculated dose length product (DLP) by multiplied the convention factor of chest (0.017). Imaging quality was assessed by radiologists using the 5-point Likert scale. The DLP was ranged from 851 to $1277mGy{\cdot}cm$ (mean: 17.23 mSv) in the 64 channel MDCT and from 82 to $110mGy{\cdot}cm$ (mean: 1.58 mSv) in the of 128 channel DSCT, respectively. The score of imaging quality was respectively $3.31{\pm}0.62$ in 64 channel MDCT and $4.05{\pm}0.46$ in the 128 channel DSCT. The exposure dose of 128 channel DSCT has decreased 1ess 1/10. The score of imaging quality was significant difference between two modalities and the frequency (>4 good) in the 128 channel DSCT is about three times than that of the 64 channel MDCT. Therefore, the 128 channel DSCT in coronary CT angiography is clinically more effective modality for both investigators and patients.

64채널 MDCT(multidetector computed tomography)와 128채널 DSCT(dual source computed tomography)를 이용한 관상동맥 전산화단층촬영 시 유효선량과 획득한 영상의 질을 평가함으로서 임상에서의 유용성을 평가하고자 하였다. 피폭선량은 선량길이곱(dose length product: DLP)에 흉부 조직의 가중치(0.017)을 곱하여 유효선량(mSv)으로 계산하였으며, 영상 평가는 심장촬영검사 후 영상의학과 전문의가 5점 Likert 척도(5점 최상)로 평가하였다. DLP 값은 64 채널 MDCT에서는 $851{\sim}1277\;mGy{\cdot}cm$ (평균 유효선량: 17.23mSv), 128 채널 DSCT에서는 $82{\sim}110\;mGy{\cdot}cm$ (평균 유효선량: 1.58mSv)로 각각 분포하였다. 영상 평가점수는 64 채널 MDCT에서 $3.31{\pm}0.62$(4점 이상 34명), 128channel DSCT에서 $4.05{\pm}0.46$(4점 이상 96명)으로 각각 나타났다. 유효선량은 64채널 MDCT에 비해 128채널 DSCT가 1/10 이상 감소함을 알 수 있었다. 영상 평가점수는 통계적으로 유의한 차이를 보였으며 4점 이상 점수의 빈도는 128채널 DSCT에서 2.8배 높게 나타났다. 결론적으로 관상동맥 전산화단층촬영검사에서는 128채널 DSCT가 64채널 MDCT에 비해 환자가 받는 유효선량은 감소하고 영상 평가점수는 높게 나타나 임상에서 보다 유용할 것으로 판단된다.

Keywords

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