Department of Biological Sciences & the Pittsburgh NMR Center for Biomedical Research, Carnegie Mellon University, Pittsburgh, Pennsylvania, USA.
Magn Reson Med. 2013 Jun;69(6):1683-90. doi: 10.1002/mrm.24414. Epub 2012 Jul 26.
Cell tracking using perfluorocarbon labels and fluorine-19 (19F) MRI is a noninvasive approach to visualize and quantify cell populations in vivo. In this study, we investigated three-dimensional compressed sensing methods to accelerate 19F MRI data acquisition for cell tracking and evaluate the impact of acceleration on 19F signal quantification. We show that a greater than 8-fold reduction in imaging time was feasible without pronounced image degradation and with minimal impact on the image signal-to-noise ratio and 19F quantification accuracy. In 19F phantom studies, we show that apparent feature topology is maintained with compressed sensing reconstruction, and false positive signals do not appear in areas devoid of fluorine. We apply the three-dimensional compressed sensing 19F MRI methods to quantify the macrophage burden in a localized wounding-inflammation mouse model in vivo; at 8-fold image acceleration, the 19F signal distribution was accurately reproduced, with no loss in signal-to-noise ratio. Our results demonstrate that three-dimensional compressed sensing methods have potential for advancing in vivo 19F cell tracking for a wide range of preclinical and translational applications.
使用全氟碳标记物和氟-19(19F)MRI 进行细胞示踪是一种无创方法,可用于在体内可视化和定量细胞群体。在这项研究中,我们研究了三维压缩感知方法,以加速用于细胞示踪的 19F MRI 数据采集,并评估加速对 19F 信号定量的影响。我们表明,在不明显降低图像质量且对图像信噪比和 19F 定量准确性影响最小的情况下,成像时间可减少 8 倍以上。在 19F 体模研究中,我们表明压缩感知重建可保持明显特征拓扑结构,并且在没有氟的区域不会出现假阳性信号。我们将三维压缩感知 19F MRI 方法应用于体内局部创伤-炎症小鼠模型中定量巨噬细胞负荷;在 8 倍图像加速的情况下,19F 信号分布被准确再现,且信噪比无损失。我们的结果表明,三维压缩感知方法具有在广泛的临床前和转化应用中推进体内 19F 细胞示踪的潜力。
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