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JKMRS Volume 24, No 3, pp 66, Partial Solution for Concomitant...
2020년 09월 20일 / 조회수: 489

 

Partial Solution for Concomitant Gradient Field in Ultra-low Magnetic Field: Correction of Distortion Artifact

 

 

Seong-Joo Lee and Jeong Hyun Shim*

 

 

Quantum Magnetic Imaging Team, Korea Research Institute of Standards and Science (KRISS), 267, Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea

 

 

 

 

Received Sep 14, 2020; Revised Sep 16, 2020; Accepted Sep 16, 2020

 


Abstract In ultra-low field magnetic resonance imaging (ULF-MRI), the strength of a static magnetic field can be comparable to that of gradient field. On that occasion, the gradient field is accompanied by concomitant gradient field, which yields distortion and blurring artifacts on MR images. Here, we focused on the distortion artifact and derived the equations capable of correcting it. Its usefulness was confirmed through the corrections in both simulated and experimental images. This solution will be effective for acquiring more accurate images in low and/or ultra-low magnetic fields.

 

Keywords ULF-NMR, ULF-MRI, Concomitant gradient field

 

* Address correspondence to: Jeong Hyun Shim, Quantum Magnetic Imaging Team, Korea Research Institute of Standards and Science (KRISS), 267, Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea, Tel: 82-42-350-1038; E-mail: jhshim@kriss.re.kr


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