边缘密度

Suppose is the unity density function of , then

分别是关于的边缘分布密度函数。

Results:"egg-shell"calcification were the feature of giant calcified and ossified tuberculoma.

结果：平片示边缘光滑，密度不均的"蛋壳样"钙化。

On the plain scan of CT, the appearances of the aneurysmal bone cyst were the various expansile changes. In destruction of bone, the capsular districts and septation can be seen. On MR T1WI and T2WI, we can see the low signal ring of the diseased region borderline, the diseased region bulk was full of fluid which has miscellaneous signals, it can be seen the low or slightly high signal. In the diseased region, the septation which have low signals both on the T1WI and T2WI can be seen.

在CT上动脉瘤样骨囊肿表现为溶骨性骨质破坏，常有不同程度膨胀性改变，骨质破坏区内可见囊状低密度区及骨性分隔，MRI表现为T1WI及T2WI上可见病灶边缘有低信号环，病灶内主体部分充满囊状液体，信号混杂，在T1WI低或中高信号，在T2WI上呈不均匀高信号，病灶内可见T1WI及T2WI上均呈低信号的分隔。

The south foot fault of Maomaoshan Mountain (F1) and the north foot fault of Jinqianghe River-Maomao-shan Mountain (F3) develop along the edge of Anyuan Basin.

结合钻孔资料，采用高密度电法对安远盆地边缘的毛毛山南麓活动断层(F1)和金强河－毛毛山北麓活动断裂(F3)进行了探测。

Results 20 cases of CT examination had made proper diagnoses,the CT imaging finding about the most of peripheral cholangiocarcinoma included:There was the atactic low density tumour in liver,its borderline was unclear,enhanced scan appearances were irregular peripheral enhancement,centripetal enhancement,and delaying enhancement;There was concretion and dilatation of bile buct in or around the focus;The local envelope of liver was lacunose and the local liver was atrophied,There was abroad putrescence and liquescence in the focus.

结果 20例CT做出了正确的诊断，大部分周围型胆管细胞癌的CT表现为肝内不规则低密度肿块边界欠清，增强扫描表现病灶边缘呈不规则环状强化，有向心性强化的趋势，出现延迟强化；病灶内或周围可见结石，病灶内及周围肝内胆管扩张；局部肝包膜回缩、肝叶萎缩，病灶内大片坏死、液化。

1Arid-subarid palaeoclimate was helpful for mechanical weathering of source rocks and torrent forming;(2) The combination of source rocks and their occurrence were liable to cause mechanical breakdown of rocks and form mudflow,(3)There was a considerable height difference along the border of the basin,(4) The density of subaqueous mudflow was 2.4-2.7g/cm3;(5)There was a high rate of accumulat...

认为本区沙三段时期满足重力流的形成条件，主要表现在六个方面：(1)干旱-半干旱的气候环境有利于母岩的机械风化和山洪的形成；(2)母岩的组合及其产状容易发生机械破碎，形成泥石流；(3)盆地边缘地形高差悬殊；(4)高密度的水下泥石流；(5)堆积速率大；(6)水深位于半深湖以下。

Seiler C, Pohl T, Wustmann K, et al. Promotion of collateral growth by granulocyte-macrophage colony-stimulating factor in patients with coronary artery disease: a randomized, double-blind, placebo-controlled study ［J］.

在体外实验以及动物实验中G-CSF能够通过激活血管内皮细胞的受体促进血管内皮细胞的迁移和增殖［18］，增加心肌梗死边缘的毛细血管的密度，改善微循环，促进侧支循环的生成。

All lesions were 7-12 mm in greatest diameter. Seven cases showed a round radiolucency or a thin clear sclerotic rim in middle or up-outer of femoral neck on X-ray film.

结果：8例股骨颈疝窝均为单侧单发病灶，X线平片仅显示7例，CT均表现为股骨颈前方皮质下类圆形骨质缺损，内为较均匀液体密度，边缘清楚伴有硬化缘，最大径线为7-12 mm.7例在X线平片上表现为股骨颈中轴线或其外上方的类圆形透亮区或硬化环。

ResultsFour cases are huge mass of solid oval with integrity of coat and smooth, clear edge; they grow at the right middle or right posterior inferior mediastinum, along the spine, no expansion of intervertebral foramen and down to enter into crura of diaphragm; their density are less uniform, in two masses with a sand calcification image. In plain scanning, the CT values is 23~33Hu; in dynamic state enhancement scanning of 4 cases the mass are not enhanced or not obviously strengthened at arterial phase, and have a linear strengthen at venous phase.

结果4例均为巨大实性椭圆形肿块，肿块包膜均完整，边缘光滑清晰；4例肿块分别位于右后中下和右后下纵隔，均沿脊柱生长，无椎间孔扩大，向下伸入膈脚后；4例肿块密度均欠均匀，2例肿块伴有一砂粒状钙化影，平扫时CT值为23～33 Hu；动态增强扫描时动脉期4例肿块均呈无强化或强化不明显，静脉期4例肿块内均见有一条线形强化。

CT appearances of both investigative group and control group were analyzed and observed,indicatrix observed included cystic bone destructions,lucent area,"ground glass"-like density,calcification,sclerotic border,internal septation and shape abnormality of bone involved.The data concerned was collected.

分析观察研究组、对照组CT表现，观察指标包括囊状骨质破坏、低密度透亮区、磨玻璃样改变、骨化、边缘硬化、内部分隔、受累骨形态改变，并记录观察数据。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。