基于椭圆信号模型的bSSFP成像带状伪影去除
Banding artifact removal for bSSFP imaging with an elliptical signal model.
作者信息
Xiang Qing-San, Hoff Michael N
机构信息
Department of Radiology, University of British Columbia, Vancouver, Canada; Department of Physics and Astronomy, University of British Columbia, Vancouver, Canada.
出版信息
Magn Reson Med. 2014 Mar;71(3):927-33. doi: 10.1002/mrm.25098.
PURPOSE
Balanced steady-state free precession (bSSFP) imaging has broad clinical applications by virtue of its high time efficiency and desirable contrast. Unfortunately, banding artifact is often seen as a result of signal modulation due to B0 inhomogeneity. This study aims to develop an effective method for banding artifact suppression.
METHODS
bSSFP is analyzed with an elliptical signal model. A simple analytical "Geometric-Solution" (GS) is presented to demodulate the signal from B0 inhomogeneity dependence with phase-cycled bSSFP data from both a computer simulation and experiments using phantom and human subjects.
RESULTS
The proposed algorithm is able to remove banding artifacts completely. It also compares favorably with the complex sum (CS), which is considered one of the more efficient methods for banding artifact correction.
CONCLUSION
Using an elliptical signal model, an analytical solution to the bSSFP banding problem has been found and demonstrated with simulation as well as phantom and in vivo experiments.
目的
平衡稳态自由进动（bSSFP）成像因其高时间效率和良好的对比度而具有广泛的临床应用。不幸的是，由于B0不均匀性导致的信号调制，常常会出现带状伪影。本研究旨在开发一种有效的带状伪影抑制方法。
方法
使用椭圆信号模型对bSSFP进行分析。提出了一种简单的解析“几何解”（GS），用于从B0不均匀性相关性中解调信号，该方法利用了来自计算机模拟以及使用体模和人体受试者的实验中经相位循环的bSSFP数据。
结果
所提出的算法能够完全消除带状伪影。它与复数求和（CS）相比也具有优势，复数求和被认为是用于带状伪影校正的更有效方法之一。
结论
利用椭圆信号模型，已经找到了bSSFP带状问题的解析解，并通过模拟以及体模和体内实验进行了验证。
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