Journal of the Korean Society of Radiology (한국방사선학회논문지)

The Korean Society of Radiology (한국방사선학회)
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Experimental Study of Chemical Shift Artifacts at 1.5T and 3.0T MRI using Gradient Echo Pulse Sequence

GE 펄스시퀀스을 이용한 1.5T와 3.0T MRI의 화학적 이동 인공물의 실험적 연구

  • Cheol, Kweon Dae (Department of Radiological Science, College of Health Science, Shinhan University)
  • 권대철 (신한대학교 보건과학대학 방사선학과)
  • Received : 2016.10.10
  • Accepted : 2016.11.30
  • Published : 2016.11.30
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Abstract

An experimental study was to use the parameter to determine the MRI artifact of chemical shift that occurs in water and fats. Scanning the image according to the encoding parameter and the bandwidth and change in 1.5T and 3.0T MRI to the SNR, we compared the CNR. In the image was confirmed that the occurrence of artefacts in the chemical shift of the water and oil. 3.0T more image artifacts in the 1.5T was confirmed that the relatively reduced. The width of the bandwidth it could be confirmed that according to the honeycombs artifacts decrease. Therefore, in order to reduce the artifacts in the MRI scan of the chemical shift runners weak field strength, is thought to be appropriate to widen the width of the bandwidth.

물과 지방에서 발생하는 화학적 이동의 인공물을 확인하기 위해 다양한 MRI parameter를 적용하여 실험하였다. MRI의 1.5T와 3.0T에서 parameter와 bandwidth 및 부호화 변화에 따른 영상을 스캔하여 SNR, CNR을 비교하였다. MRI 영상에서 물과 기름의 화학적 이동의 인공물의 발생을 확인할 수 있었고, 3.0T보다 1.5T에서의 영상이 인공물이 비교적 줄어드는 것을 확인할 수 있었다. Bandwidth의 폭이 넓어짐에 따라 인공물이 줄어드는 것을 확인할 수 있었다. 따라서 MRI검사에서 화학적 이동의 인공물을 감소하기 위해서는 주 자장의 세기가 약하고, bandwidth의 폭을 넓히는 것이 적절할 것으로 생각된다.

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