Multi-slice myelin water imaging for practical clinical applications at 3.0 T.

Multi-slice myelin water imaging for practical clinical applications at 3.0 T.
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DOI:
10.1002/mrm.24527
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发表时间:
2013-09
影响因子:
3.3
通讯作者:
Reddick, Wilburn E.
Reddick, Wilburn E.
中科院分区:
医学3区
文献类型:
--
作者:
Guo, Junyu;Ji, Qing;Reddick, Wilburn E.

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髓鞘水显像是一种很有前途的无创技术,用于评估白质疾病,如多发性硬化症和其他白质脑病(LE),并监测儿童早期的髓鞘形成。遗憾的是,图像质量差和采集时间长是实际临床应用的主要障碍。本研究提出了一种新的后处理方法,利用加权正则化非负最小二乘算法和非局部平均滤波器(T2SPARC),采用高效的多片采集方案,即T2频谱分析,克服了这些障碍,实现了更短的采集时间、更高的图像质量和更大的体积覆盖。来自健康志愿者和LE患者的体内结果表明,T2SPARC方法可以在11分钟内生成10片髓鞘水分数(MWF)图。该方法还产生了一些有用的副产品,如细胞内和细胞外水分数(IEWF)和长T2组织水分数(LWF)图,可以量化不同脑疾病的病变。
Myelin water imaging is a promising, noninvasive technique for evaluating white matter diseases such as multiple sclerosis and other leukoencephalopathies (LE), and monitoring myelination in early childhood. Unfortunately, poor image quality and a long acquisition time are major obstacles to practical clinical applications. In this study, a novel postprocessing method with an efficient multi-slice acquisition scheme, called T2 spectrum analysis using a weighted regularized non-negative least squares algorithm and non-local mean filter (T2SPARC), is presented to overcome these obstacles and achieve a shorter acquisition time, higher image quality, and large volume coverage. In vivo results from healthy volunteers and a patient with LE showed that the T2SPARC method can generate robust and high-quality myelin water fraction (MWF) maps of 10 slices within 11 minutes. This method also yields some useful byproducts such as intra- and extracellular water fraction (IEWF) and long T2 tissue water fraction (LWF) maps, which can quantify lesions in different brain diseases.
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