TY - GEN
T1 - Improved image reconstruction from sensitivity-encoded data by wavelet denoising and tikhonov regularization
AU - Liang, Zhi Pei
AU - Bammer, Roland
AU - Ji, Jim
AU - Pelc, Norbert J.
AU - Glover, Gary H.
N1 - Publisher Copyright:
© 2002 IEEE.
PY - 2002
Y1 - 2002
N2 - Parallel magnetic resonance imaging through sensitivity encoding using multiple receiver coils has emerged as an effective tool to reduce imaging time. However, errors in both the estimated coil sensitivity maps and the measured data, and the ill-conditioned nature of the coefficient matrix (often associated with non-localized coils) can degrade image quality significantly, limiting speed enhancements. In this paper, we propose to use wavelet denoising to reduce noise in the coil sensitivity maps and a specially-designed TIkhonov regularization scheme to solve the ill-conditioned matrix equation. Experimental results show that these techniques produce significantly better images (with an improved signal-to-noise ratio and reduced aliasing artifacts) than conventional reconstruction methods based on matrix inversion with a diagonal regularization matrix.
AB - Parallel magnetic resonance imaging through sensitivity encoding using multiple receiver coils has emerged as an effective tool to reduce imaging time. However, errors in both the estimated coil sensitivity maps and the measured data, and the ill-conditioned nature of the coefficient matrix (often associated with non-localized coils) can degrade image quality significantly, limiting speed enhancements. In this paper, we propose to use wavelet denoising to reduce noise in the coil sensitivity maps and a specially-designed TIkhonov regularization scheme to solve the ill-conditioned matrix equation. Experimental results show that these techniques produce significantly better images (with an improved signal-to-noise ratio and reduced aliasing artifacts) than conventional reconstruction methods based on matrix inversion with a diagonal regularization matrix.
UR - http://www.scopus.com/inward/record.url?scp=84948687116&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84948687116&partnerID=8YFLogxK
U2 - 10.1109/ISBI.2002.1029302
DO - 10.1109/ISBI.2002.1029302
M3 - Conference contribution
AN - SCOPUS:84948687116
T3 - Proceedings - International Symposium on Biomedical Imaging
SP - 493
EP - 496
BT - 2002 IEEE International Symposium on Biomedical Imaging, ISBI 2002 - Proceedings
PB - IEEE Computer Society
T2 - IEEE International Symposium on Biomedical Imaging, ISBI 2002
Y2 - 7 July 2002 through 10 July 2002
ER -