A fast diffusion weighted MR imaging technique using radial sampling = 방사형 샘플링을 이용한 고속 자기공명 확산 강조 영상법

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Diffusion weighted MRI obtains the contrast to use the spin`s Brownian motion. There is a need for an imaging sequence that can reduce the imaging time and provide a high resolution diffusion weighted image. By using a projection reconstruction imaging sequence, it is possible to obtain a high resolution diffusion weighted image. However, very long acquisition time is an inevitable problem of this sequence. So by em-ploying a sequence based on radial trajectories which projection views have different directional information of diffusion each other, a diffusion weighted can be produced quickly. The ordering about directions of diffu-sion gradients is proposed to reduce the artifacts for diffusion anisotropy in this paper. The computer simula-tions were performed to evaluate the proposed method. Experimental results from the phantom and brain stud-ies suggest that the new technique is more accurate as well as more fast. The proposed method can be used to obtain a high resolution diffusion weighted image in human brain and apply in air-tissue interface, where EPI cannot be employed, such as cholesteatoma.
Advisors
Park, Hyun-Wookresearcher박현욱
Description
한국과학기술원 : 전기및전자공학과,
Publisher
한국과학기술원
Issue Date
2012
Identifier
509465/325007  / 020113285
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 전기및전자공학과, 2012.8, [ v, 52 p. ]

Keywords

diffusion weighted imaging; diffusion tensor imaging; apparent diffusion coefficient; projection reconstruction; 확산강조 영상법; 확산텐서 영상법; 확산 계수; 투사 영상 복원; 자기공명영상; MRI

URI
http://hdl.handle.net/10203/180619
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=509465&flag=dissertation
Appears in Collection
EE-Theses_Master(석사논문)
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