期刊
NMR IN BIOMEDICINE
卷 28, 期 10, 页码 1294-1303出版社
WILEY-BLACKWELL
DOI: 10.1002/nbm.3383
关键词
quantitative susceptibility mapping; streaking artifact reduction; cerebral hematoma; multiple sclerosis
资金
- National Institutes of Health [NIBIB P41EB015897, NIBIB T32EB001040, NIMH R01MH096979, NINDS R01NS079653, NIMH R24MH106096, NHLBI R21HL122759]
- National Multiple Sclerosis Society [RG4723]
Quantitative susceptibility mapping (QSM) is a novel MRI technique for the measurement of tissue magnetic susceptibility in three dimensions. Although numerous algorithms have been developed to solve this ill-posed inverse problem, the estimation of susceptibility maps with a wide range of values is still problematic. In cases such as large veins, contrast agent uptake and intracranial hemorrhages, extreme susceptibility values in focal areas cause severe streaking artifacts. To enable the reduction of these artifacts, whilst preserving subtle susceptibility contrast, a two-level QSM reconstruction algorithm (streaking artifact reduction for QSM, STAR-QSM) was developed in this study by tuning a regularization parameter to automatically reconstruct both large and small susceptibility values. Compared with current state-of-the-art QSM methods, such as the improved sparse linear equation and least-squares (iLSQR) algorithm, STAR-QSM significantly reduced the streaking artifacts, whilst preserving the sharp boundaries for blood vessels of mouse brains in vivo and fine anatomical details of high-resolution mouse brains ex vivo. Brain image data from patients with cerebral hematoma and multiple sclerosis further illustrated the superiority of this method in reducing streaking artifacts caused by large susceptibility sources, whilst maintaining sharp anatomical details. STAR-QSM is implemented in STI Suite, a comprehensive shareware for susceptibility imaging and quantification. Copyright (C) 2015 John Wiley & Sons, Ltd.
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