脑白质

Materials and Methods: The MRI findings of 64 cases of subcortical arteriosclerotic encephalopathy were analyzed and compared with the CT results in 34 cases.

材料和方法：分析64例皮层下动脉硬化性脑白质病的MRI表现，并与34例CT结果比较。

Methods: Retrospective investigation on cranial CT and clinical was carried out in our 100 admitted cases with LA.

对100例脑白质稀疏患者的CT及临床资料进行回顾性分析研究。

Results: In 13 cases with leukoencephalopathy, 11 cases had diffusive even lesions of SCC, 2 cases had thin banding marginate lesions at the back part of splenium. The brain lesions of leukoencephalopathy were symmetric, 4 cases didn't show any change in follow-up MRI examination.

结果：脑白质病(n=13)中11例MRI呈弥漫均匀形SCC灶，2例为边缘薄带形SCC灶，脑内病灶均为均匀、连续、对称分布，4例MRI复查未见明显变化。

Objective: In cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy arteriolar walls are thickened with destruction of vascular smooth muscle cells and deposits of granular osmiophilic material.

目的：伴有皮层下梗死和脑白质病的常染色体显性遗传性脑动脉病的病理特征是血管损害，首先侵及中-小动脉，以血管平滑肌细胞变性为特征并可见嗜锇酸颗粒物质沉积。

Of the 19 cases,19 fetus were found,MRI confirmed 14 cases considered or suspected as fetal corpus callosum agenesis by US(8 cases are completed agenesis of corpus collosom-CACC,6 cases are partial agenesis of corpus collosom-PACC, and 5 cases had took on autopsy),however 3 cases are mild enlargement of lateral cerebral ventricle and 2 cases are leukodystrophy.In these cases,MRI confirmed a Dandy-Walker syndrome and a lipoma of corpus callosum suspected by US,detect a Dandy-Walker syndrome and a microcephalus made missed diagnoses by US.The fetal corpus callosum and additional cerebral anomalies were shown more clearly on MR T_2-weighted images.

胎儿胼胝体长度与额枕径的比值在24～36孕龄阶段相对较恒定。2、19例孕妇共检出胎儿19个，MRI证实超声疑诊的胎儿胼胝体发育不全14例(完全型胼胝体发育不全8例，部分型胼胝体发育不全6例，有胎儿尸检结果对照者5例)，3例为单纯侧脑室轻度扩张，2例考虑脑白质发育不良，合并Dandy—Walker综合征1例，胼胝体脂肪瘤1例，检出超声漏诊合并Dandy-Walker综合征1例及脑小畸形1例。

The signal intensity characteristic of MRI associated with brain myelinization is helpful to differentiate the normal and abnormal brain maturation.Also,T1WI is much more useful in the detection of immature myelin and in monitoring of normal brain development in the first 6 months of life.On the other hand,T2WI is more useful after 6 months of life.

不同月龄段不同解剖部位正常脑髓鞘化具有各自MRI信号特征，有利于评判是否脑发育正常和患脑白质病，T1WI评估未成熟髓鞘较好，T2WI确定髓鞘是否成熟较好。

Results Irregular symmetrical sheets of lesions with low density around bilateral ventricles were seen in all patients and 62 cases around the front horns, 53 cases retral horns and 38 cases beside the ventricles.

结果 ：72例患者 CT平扫均见双侧侧脑室前后角及体部旁或半卵圆中心区脑白质大小不等斑片状不规则的大致对称的低密度影，发生在侧脑室前角周围 6 2例，后角周围 5 3例，侧脑室体旁 38例，半卵圆区 19例，伴有腔隙性脑梗死 4 1例。

Results DTI demonstrated that the influences of space-occupying effect and infiltrating invasion of brain tumor and peritumoral edema on white matter fiber tracts could be divided into three types: displacement, syzygium and destruction.

结果 DTI显示脑白质纤维束受脑肿瘤占位效应、浸润和瘤周水肿等影响，而表现为移位、融合和破坏三种形式，可合并两种或三种形式存在。

Purpose Perfusion-weighted images were acquired to analyze quantitatively the changes of cerebral hemodynamics in adult unmedicated patients with obsessive-compulsive disorder after symptom provocation.

高分辨率MRI三维全脑结构像发现OCD成年患者脑白质、尾状核、壳核和苍白球体积的改变，为OCD病理生理学研究提供重要的神经影像学依据。

Purpose To determine the specific effect of pontomedullary involvement in the diagnosis of ALD on MR images.

目的 估价桥延脑皮质脊髓束受累在肾上腺脑白质营养不良的影像诊断上的特殊价值。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。