Journal of the Korean Society of Radiology (대한영상의학회지)

The Korean Society of Radiology (대한영상의학회)
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Metallic Artifacts on MR Imaging and Methods for Their Reduction

MR 영상에서의 금속 인공물과 감소방법

  • Choo, Hye Jung (Department of Radiology, Inje University Busan Paik Hospital) ;
  • Lee, Sun Joo (Department of Radiology, Inje University Busan Paik Hospital) ;
  • Lee, Young Han (Department of Radiology, Research Institute of Radiological Science and Center for Clinical Imaging Data Science (CCIDS), Yonsei University College of Medicine)
  • 추혜정 (인제대학교 부산백병원 영상의학과) ;
  • 이선주 (인제대학교 부산백병원 영상의학과) ;
  • 이영한 (연세대학교 의과대학 영상의학교실, 방사선의과학연구소, 임상영상데이터사이언스센터)
  • Received : 2019.10.22
  • Accepted : 2019.12.17
  • Published : 2020.01.01
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Abstract

Metallic artifacts on MR imaging are typically induced by differences in magnetic susceptibility between the metallic implant and surrounding tissue. Conventional techniques for metal artifact reduction require MR machines with low field strength, shift in the frequency-encoding and phase-encoding directions according to the axis of metallic implant, increased receiver bandwidth and matrix, decreased slice thickness, and utilization of the short tau inversion recovery or Dixon method for fat-suppression. Slice-encoding for metal artifact correction and multi-acquisition variable-resonance image combination can dramatically reduce the number of metallic artifacts. However, these sequences have a considerably long acquisition time. Furthermore, the recently developed acceleration techniques including compressed sensing can solve this problem.

MR 영상에서 금속 인공물은 금속 삽입물과 주변 조직의 magnetic susceptibility의 차이에 의해 나타난다. 금속 인공물을 줄이는 일반적인 방법은 낮은 자장의 MR 장비를 사용하고, 금속물의 방향에 따라 주파수부호화 방향과 위상부호화 방향을 바꾸고, receiver bandwidth와 matrix를 높이며, 절편 두께를 작게 하고 short tau inversion recovery나 Dixon 기법을 사용하여 fat-suppression을 하는 것이다. Slice-encoding for metal artifact correction이나 multi-acquisition variable-resonance image combination을 통해 보다 강력하게 금속 인공물을 줄일 수 있다. 그러나 이 방법의 최대 단점은 촬영 시간이 길다는 것이나 최근 개발된 compressed sensing과 같은 고속화 기법을 통해 이를 해결할 수 있게 되었다.

Keywords

Acknowledgement

This material is based upon work supported by the Ministry of Trade, Industry & Energy (MOTIE, Korea) under industrial Technology Innovation Program. No.10062728.

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