Utilization of a balanced steady state free precession signal model for improved fat/water decomposition.
Utilization of a balanced steady state free precession signal model for improved fat/water decomposition.
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DOI：
10.1002/mrm.25728
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发表时间：
2016-03
影响因子：
3.3
通讯作者：
Block, Walter F.
中科院分区：
文献类型：
--
作者：
Bancroft, Leah C. Henze;Strigel, Roberta M.;Hernando, Diego;Johnson, Kevin M.;Kelcz, Frederick;Kijowski, Richard;Block, Walter F.
基于化学位移的脂肪/水分解方法（如IDEAL）经常用于具有较大B 0不均匀性的挑战性成像环境。然而，它们不考虑由平衡SSFP采集引入的信号调制。在这里，我们展示了当bSSFP频率响应被适当地并入分解过程中使用的多峰频谱脂肪模型时的改进性能。平衡的SSFP允许快速成像，但也引入了具有周期性零点和通带的特征频率响应。相邻通带中的脂肪光谱分量将经历体相位偏移和幅度调制，其改变脂肪光谱分量之间的预期相长干涉和相消干涉。将bSSFP信号模型纳入脂肪/水分解过程，并用于在1.5特斯拉下生成4名正常志愿者的脂肪体模图像以及双侧乳房和膝关节图像。将bSSFP信号模型结合到分解过程中改善了脂肪/水分解的性能。该模型的结合允许快速bSSFP成像序列利用稳健的脂肪/水分解方法，如IDEAL。虽然只有一组成像参数，该方法是兼容的任何场强或TR。
Chemical shift based fat/water decomposition methods such as IDEAL are frequently used in challenging imaging environments with large B0 inhomogeneity. However, they do not account for the signal modulations introduced by a balanced SSFP acquisition. Here we demonstrate improved performance when the bSSFP frequency response is properly incorporated into the multi-peak spectral fat model used in the decomposition process. Balanced SSFP allows for rapid imaging but also introduces a characteristic frequency response featuring periodic nulls and pass bands. Fat spectral components in adjacent pass bands will experience bulk phase offsets and magnitude modulations that change the expected constructive and destructive interference between the fat spectral components. A bSSFP signal model was incorporated into the fat / water decomposition process and used to generate images of a fat phantom, and bilateral breast and knee images in four normal volunteers at 1.5 Tesla. Incorporation of the bSSFP signal model into the decomposition process improved the performance of the fat/water decomposition. Incorporation of this model allows rapid bSSFP imaging sequences to utilize robust fat/water decomposition methods such as IDEAL. While only one set of imaging parameters were presented, the method is compatible with any field strength or TR.
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