지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록· 키워드
오류제보하기
Parallel imaging technique can provide several advantages for a multitude of MRI applications. Especially,in SENSE technique, sensitivity maps were always required in order to determine the reconstruction matrix, therefore,a number of difference approaches using sensitivity information from coils have been demonstrated to improve of image quality. Moreover, many filtering methods were proposed such as adaptive matched filter and nonlinear diffusion technique to optimize the suppression of background noise and to improve of image quality. In this study, we performed SENSE reconstruction using computer simulations to confirm the most suitable method for the feasibility of filtering effect and according to changing order of polynomial fit that were applied on variation of spatial resolution of sensitivity map. The image was obtained at 0.32T(Magfinder II, Genpia, Korea) MRI system using spin-echo pulse sequence(TR/TE = 500/20 ms, FOV = 300 mm, matrix = 128 × 128, thickness = 8 mm). For the simulation, obtained image was multiplied with four linear-array coil sensitivities which were formed of 2D-gaussian distribution and the image was complex white gaussian noise was added. Image processing was separated to apply two methods which were polynomial fitting and filtering according to spatial resolution of sensitivity map and each coil image was subsampled corresponding to reduction factor(r-factor) of 2 and 4. The results were compared to mean value of geomety factor(g-factor) and artifact power(AP) according to r-factor 2 and 4. Our results were represented while changing of spatial resolution of sensitivity map and r-factor, polynomial fit methods were represented the better results compared with general filtering methods. Although our result had limitation of computer simulation study instead of applying to experiment and coil geometric array such as linear, our method may be useful for determination of optimal sensitivity map in a linear coil array.
목차
등록된 정보가 없습니다.
참고문헌 (12)
참고문헌 신청
D.J. Larkman / 2006 / Beyond the g-Factor Limit in Sensitivity Encoding Using Joint Histogram Entropy / Mag. Reson. Med 55 (1) : 153 ~ 160
D.W. McRobbie / 2004 / MRI From Picture to Proton, 2nd ed / Cambridge Univ. Press : 137 ~
H. Omer / 2010 / A Graphical Generalized Implementation of SENSE Reconstruction Using Matlab / Concepts Magn. Reson. Part A 36 (3) : 178 ~ 186
H.J. Tian / 2007 / A Robust Method for Parallel MRI SENSE Reconstruction / Proc. 1st IEEE ICBBE : 679 ~ 681
J.B. Son / 2004 / Adaptive SENSE Reconstruction for Parallel Imaging with Massive Array Coils / Proc. 26th IEEE EMBS : 1064 ~ 1067
D.W. McRobbie / 2004 / MRI From Picture to Proton, 2nd ed / Cambridge Univ. Press : 137 ~
H. Omer / 2010 / A Graphical Generalized Implementation of SENSE Reconstruction Using Matlab / Concepts Magn. Reson. Part A 36 (3) : 178 ~ 186
H.J. Tian / 2007 / A Robust Method for Parallel MRI SENSE Reconstruction / Proc. 1st IEEE ICBBE : 679 ~ 681
J.B. Son / 2004 / Adaptive SENSE Reconstruction for Parallel Imaging with Massive Array Coils / Proc. 26th IEEE EMBS : 1064 ~ 1067
이 논문의 저자 정보
최근 본 자료
댓글(0)
0