Journal of the Korean Society of Radiology (한국방사선학회논문지)

The Korean Society of Radiology (한국방사선학회)
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The Study on Reduction of Image Distortion by using Single-Shot Turbo Spin Echo in Brain Stem Diffusion MRI

자기공명 확산강조영상검사 시 영상왜곡 감소에 관한 연구

  • Choi, Kwan-Woo (Department of Radiology, Asan Medical Center) ;
  • Lee, Ho-Beom (Department of Radiology, Asan Medical Center) ;
  • Na, Sa-Ra (Department of Radiology, Asan Medical Center) ;
  • Yoo, Beong-Gyu (Department of Radiotechnology, Wonkwang Health Science University) ;
  • Son, Soon-Yong (Department of Radiotechnology, Wonkwang Health Science University)
  • 최관우 (서울아산병원 영상의학과) ;
  • 이호범 (서울아산병원 영상의학과) ;
  • 나사라 (서울아산병원 영상의학과) ;
  • 유병규 (원광보건대학교 방사선과) ;
  • 손순룡 (원광보건대학교 방사선과)
  • Received : 2016.05.18
  • Accepted : 2016.06.30
  • Published : 2016.06.30
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Abstract

Single-shot echo planar imaging(SS-EPI) is well established as high sensitivity for ischemic stroke. However, it is prone to susceptibility artifact in brain stem that diminish the image quality. single-shot turbo spin echo(SS-TSE) is a new DWI technique that can reduce susceptibility artifact. Thus, this research was conducted so as to reduce geometric distortion in brain stem by using single-shot turbo spin echo technique. Thirty patients without brain disease underwent diffusion MR on a 3T scanner with SS-EPI and SS-TSE. Obtained images with both sequences were analyzed for geometric distortion and error percentage as well. Image quality in terms of geometric distortion of SS-TSE were found to be significantly better than those for SS-EPI. And error percentage was considerably reduced for 2.4% of b0 image(from 11.1% to 8.7%), 1.2% of b1000 image(from 11.4% to 10.1%), respectively. In summary, diffusion MR using SS-TSE significantly reduce geometric distortion compared to SS-EPI in brain stem and may provide improved diagnostic performance.

본 연구는 DWI 검사 시 자화율 차이로 인해 뇌줄기에 발생하는 영상의 왜곡을 새로운 SS-TSE를 적용하여 감소시키고자 하였다. 연구방법은 2015년 7월부터 동년 9월까지 DWI 검사를 검사한 30명을 대상으로, 기존의 SS-EPI 기법과 새로운 SS-TSE를 적용하여 기법에 따른 뇌줄기의 왜곡과 오차율을 비교평가 하였다. 연구결과, 새로운 SS-TSE 적용 시 왜곡이 감소된 것을 볼 수 있으며, 오차율 또한 b0 영상은 2.4%(11.1%에서 8.7%), b1000 영상은 1.2%(11.4%에서 10.1%) 감소하는 것을 볼 수 있었다. 결론적으로, 뇌줄기의 DWI 검사 시 본 연구의 SS-TSE를 이용하면 기존 기법 사용 시 발생하는 영상의 왜곡을 감소시킬 수 있어 진단적 가치가 높은 영상을 획득할 수 있다.

Keywords

References

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