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[利用磁共振成像对儿童大脑正常髓鞘形成的荟萃分析]

[Normal myelination in childhood brains using MRI--a meta analysis].

作者信息

Staudt M, Krägeloh-Mann I, Grodd W

机构信息

Sektion experimentelle Kernspinresonanz des ZNS, Radiologische Universitätsklinik, Tübingen.

出版信息

Rofo. 2000 Oct;172(10):802-11. doi: 10.1055/s-2000-7898.

DOI:10.1055/s-2000-7898
PMID:11111291
Abstract

PURPOSE

To establish age limits for the assessment of normal myelination of the brain on T1-weighted (T1w) and T2-weighted (T2w) images.

METHOD

Comparison of previous publications (Barkovich et al. 1988, Grodd 1993, Hayakawa et al. 1990, Hittmair et al. 1994, Martin et al. 1988/1990/1991, Nakagawa et al. 1998, Staudt et al. 1993/1994, Stricker et al. 1990).

RESULTS

Despite technical and methodological differences, these studies principally agreed on the timing of myelination for most regions of the brain. Thus, a common time-table could be established: At 1 month, myelin is visible on both T1w and T2w in the medulla oblongata, tegmentum pontis, cerebellar peduncles and vermis, quadrigeminal plate, decussation of superior cerebellar peduncles, thalamus, posterior limb of internal capsule, optic radiation, corona radiata. Thereafter, the myelin-typical signal in the different regions of the brain should be present at the following ages (M = months): anterior limb of internal capsule (2 M: T1w; 7 M: T2w), splenium of corpus callosum (4 M: T1w; 6 M: T2w), genu of corpus callosum (6 M: T1w; 8 M: T2w), centrum semiovale (2 M: T1w; 7 M: T2w). Branching of myelin into the gyri of the telencephalon (= arborization) appears at the latest at: occipital lobe (5 M: T1w; 12 M: T2w) and frontal lobe (7 M: T1w; 14 M: T2w).

CONCLUSION

These extracted age limits can be used for a more reliable assessment of myelination than the time-tables from a single study.

摘要

目的

确定在T1加权(T1w)和T2加权(T2w)图像上评估大脑正常髓鞘形成的年龄界限。

方法

比较先前的出版物(Barkovich等人,1988年;Grodd,1993年;Hayakawa等人,1990年;Hittmair等人,1994年;Martin等人,1988/1990/1991年;Nakagawa等人,1998年;Staudt等人,1993/1994年;Stricker等人,1990年)。

结果

尽管存在技术和方法上的差异,但这些研究在大脑大多数区域的髓鞘形成时间上基本达成一致。因此,可以建立一个通用的时间表:1个月时,延髓、脑桥被盖、小脑脚和蚓部、四叠体板、上小脑脚交叉、丘脑、内囊后肢、视辐射、放射冠在T1w和T2w上均可见到髓鞘。此后,大脑不同区域的典型髓鞘信号应在以下年龄出现(M = 月):内囊前肢(2M:T1w;7M:T2w),胼胝体压部(4M:T1w;6M:T2w),胼胝体膝部(6M:T1w;8M:T2w),半卵圆中心(2M:T1w;7M:T2w)。髓鞘分支进入端脑回(= 树状分布)最晚出现在:枕叶(5M:T1w;12M:T2w)和额叶(7M:T1w;14M:T2w)。

结论

与单一研究的时间表相比,这些提取的年龄界限可用于更可靠地评估髓鞘形成情况。

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