k-space water-fat decomposition with T2* estimation and multifrequency fat spectrum modeling for ultrashort echo time imaging.
k-space water-fat decomposition with T2* estimation and multifrequency fat spectrum modeling for ultrashort echo time imaging.
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DOI：
10.1002/jmri.22121
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发表时间：
2010-04
影响因子：
4.4
通讯作者：
Du, Jiang
中科院分区：
文献类型：
--
作者：
Wang, Kang;Yu, Huanzhou;Brittain, Jean H.;Reeder, Scott B.;Du, Jiang
关键词：
目的：证明一种基于化学位移的水-脂肪分离方法(理想)与二维超短回波时间(UTE)序列相结合的可行性，用于对脂肪抑制较强的短T2组织进行成像和量化。将二维多层UTE数据采集方案与理想的处理相结合，包括估计、化学位移伪影校正和脂肪频谱的多频建模，对短T2组织(如跟腱和半月板)进行了体内外图像处理。文中还研究了将一种先进的场图估计技术，如区域生长(RG)方法，融入到这种组合方法中。理想结合UTE成像是可行的，同时估计和化学位移伪影校正可以获得良好的跟腱和半月板的水-脂分离。脂肪光谱的多频率建模产生了更完整的水-脂肪分离，并对化学位移伪影进行了更准确的校正。RG计划有助于避免水脂互换。UTE数据采集与理想的结合在短T2组织的成像和量化方面具有潜在的应用，从而消除了可能直接抑制短T2信号的脂肪抑制脉冲的必要性。
To demonstrate the feasibility of combining a chemical shift-based water-fat separation method (IDEAL) with a 2D ultrashort echo time (UTE) sequence for imaging and quantification of the short T2 tissues with robust fat suppression. A 2D multislice UTE data acquisition scheme was combined with IDEAL processing, including estimation, chemical shift artifacts correction, and multifrequency modeling of the fat spectrum to image short T2 tissues such as the Achilles tendon and meniscus both in vitro and in vivo. The integration of an advanced field map estimation technique into this combined method, such as region growing (RG), is also investigated. The combination of IDEAL with UTE imaging is feasible and excellent water-fat separation can be achieved for the Achilles tendon and meniscus with simultaneous estimation and chemical shift artifact correction. Multifrequency modeling of the fat spectrum yields more complete water-fat separation with more accurate correction for chemical shift artifacts. The RG scheme helps to avoid water-fat swapping. The combination of UTE data acquisition with IDEAL has potential applications in imaging and quantifying short T2 tissues, eliminating the necessity for fat suppression pulses that may directly suppress the short T2 signals.
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