Simultaneous Quantification of Anisotropic Microcirculation and Microstructure in Peripheral Nerve.

Simultaneous Quantification of Anisotropic Microcirculation and Microstructure in Peripheral Nerve.
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DOI:
10.3390/jcm11113036
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发表时间:
2022-05-27
影响因子:
3.9
通讯作者:
--
中科院分区:
医学2区
文献类型:
--
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周围神经损伤是一项重大的公共卫生挑战,神经灌注是评估损伤严重程度和预后前景的潜在生物标志物。在这里,我们应用了一种新颖的形式,结合了体素内不相干运动(IVIM)和扩散张量成像(DTI)来同时表征大鼠坐骨神经中的各向异性微循环和微结构。与死后测量结果的比较显示,体内 IVIM-DTI 信号包含一个快速隔室(2.32 ± 0.04 × 10−3 mm2/s 平均扩散率,平均值 ± sem,n = 6,配对 t 检验 p < 0.01),这可能归因于微循环,此外还有一个与死后神经具有相似平均扩散率的较慢隔室(1.04 ± 0.01 与 0.96 ± 0.05 × 10−3 mm2/s, p > 0.05)。尽管需要进一步的研究和技术改进,但这项初步研究证明了将 IVIM-DTI 方法应用于周围神经以在存在各向异性组织微结构的情况下量化灌注的可行性和潜力。
Peripheral nerve injury is a significant public health challenge, and perfusion in the nerve is a potential biomarker for assessing the injury severity and prognostic outlook. Here, we applied a novel formalism that combined intravoxel incoherent motion (IVIM) and diffusion tensor imaging (DTI) to simultaneously characterize anisotropic microcirculation and microstructure in the rat sciatic nerve. Comparison to postmortem measurements revealed that the in vivo IVIM-DTI signal contained a fast compartment (2.32 ± 0.04 × 10−3 mm2/s mean diffusivity, mean ± sem, n = 6, paired t test p < 0.01) that could be attributed to microcirculation in addition to a slower compartment that had similar mean diffusivity as the postmortem nerve (1.04 ± 0.01 vs. 0.96 ± 0.05 × 10−3 mm2/s, p > 0.05). Although further investigation and technical improvement are warranted, this preliminary study demonstrates both the feasibility and potential for applying the IVIM-DTI methodology to peripheral nerves for quantifying perfusion in the presence of anisotropic tissue microstructure.
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