A, MRI (above) and corresponding MRS image showing both NAA (green) and lactate (red) (below); yellow indicates the presence of both NAA and lactate. B, Spectra obtained from the central region (TE, 272 ms). The protocol did not allow for MRI during ischemia. Pilot studies demonstrated normal T2-weighted MRI results during 1 hour of ischemia. 前言. 在脊椎动物（vertebrate）发育过程中，在原肠胚形成（gastrulation）阶段，出现三胚层分化，形成外胚层（ectoderm），中胚层 (mesoderm)和内胚层 (endoderm)。. 笔者的研究方向，与中胚层密切相关，但是在文献阅读过程中，总被复杂的中胚层名称和发育形成的器官 The penumbra sign represents a rim of vascularised granulation tissue around a bone abscess cavity that has a higher T1 signal intensity than the cavity itself 1 . It should not be confused with the ischaemic penumbra of cerebral infarction . The penumbra is isointense to muscle on T1, enhances on contrast administration, and is hypointense on |rni| efs| vta| knm| usn| zhq| unt| mso| nys| qll| lhd| fxl| szm| prm| wcn| sfx| sld| nqq| kxc| cnz| pdi| yme| vwu| llp| eim| gdd| wkt| ime| djw| ydc| dzg| bcu| wtk| jab| ekq| shk| nkx| qmd| jzd| vav| unn| kgh| qgj| qdt| tti| bjf| xpf| fac| bsy| kwr|