Characterisation of the neonatal brain using myelin-sensitive magnetisation transfer imaging

Characterisation of the neonatal brain using myelin-sensitive magnetisation transfer imaging
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使用髓磷脂敏感磁化转移成像表征新生儿大脑

DOI:
10.1162/imag_a_00017
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发表时间:
2023
期刊:
Imaging Neuroscience
影响因子:
--
通讯作者:
Cábez M
Cábez M
中科院分区:
--
文献类型:
--
作者:
Cábez M

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早产儿脑病的一个主要特征是发育中的白色物质发育不良和随后的髓鞘形成不足。磁化传递成像(MTI)提供了髓鞘形成的替代标记,包括磁化传递率(MTR)和磁化传递饱和度(MTsat)。使用来自105名新生儿的数据,我们在发育中的大脑中检测MTR和MTsat,并研究这些标记物如何受到扫描时胎龄和早产的影响。我们探讨了这两个措施的相关性与分数各向异性(FA),径向扩散率(RD)和T1 w/T2 w比,这是常用的标记白色物质的完整性在早期生活。我们使用了两种互补的分析方法:体素分析整个白色物质骨架,并在16个主要的白色物质束感兴趣的分析。我们发现MTR和MTsat与扫描时的胎龄呈正相关。在足月年龄的早产儿有较低的MTsat值在胼胝体的背侧和压部,而MTR较高的中央白色物质区域,皮质脊髓束和钩束。MTI指标与其他MRI参数的相关性显示,在体素水平上,T1 w/T2 w与MTsat和MTR之间存在中度正相关,但在束水平上,FA与这些指标具有更强的正相关性。RD与MTI指标的相关性最强,特别是与主要白色物质束中的MTsat。观察到的MTI指标的变化与出生后早期髓鞘密度的增加一致,与足月对照组相比,足月年龄的早产儿髓鞘形成和细胞/轴突密度较低。此外,MTI衍生的功能和传统的措施,从扩散MRI之间的相关性提供了新的理解髓鞘的贡献,非特异性成像指标,通常用于早期脑发育。
A cardinal feature of the encephalopathy of prematurity is dysmaturation of developing white matter and subsequent hypomyelination. Magnetisation transfer imaging (MTI) offers surrogate markers for myelination, including magnetisation transfer ratio (MTR) and magnetisation transfer saturation (MTsat). Using data from 105 neonates, we characterise MTR and MTsat in the developing brain and investigate how these markers are affected by gestational age at scan and preterm birth. We explore correlations of the two measures with fractional anisotropy (FA), radial diffusivity (RD) and T1w/T2w ratio which are commonly used markers of white matter integrity in early life. We used two complementary analysis methods: voxel-wise analysis across the white matter skeleton, and tract-of-interest analysis across 16 major white matter tracts. We found that MTR and MTsat positively correlate with gestational age at scan. Preterm infants at term-equivalent age had lower values of MTsat in the genu and splenium of the corpus callosum, while MTR was higher in central white matter regions, the corticospinal tract and the uncinate fasciculus. Correlations of MTI metrics with other MRI parameters revealed that there were moderate positive correlations between T1w/T2w and MTsat and MTR at voxel level, but at tract level FA had stronger positive correlations with these metrics. RD had the strongest correlations with MTI metrics, particularly with MTsat in major white matter tracts. The observed changes in MTI metrics are consistent with an increase in myelin density during early postnatal life, and lower myelination and cellular/axonal density in preterm infants at term-equivalent age compared to term controls. Furthermore, correlations between MTI-derived features and conventional measures from diffusion MRI provide new understanding about the contribution of myelination to non-specific imaging metrics that are often used to characterise early brain development.
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