Results 31 to 40 of about 10,853 (164)

Segmentation and 3D Reconstruction of Cerebro-Spinal Fluid Images Sequence [PDF]

open access: yes, 2012
在脑积水检查中,医生往往无法通过二维图片序列直观地看到前后两个图片间的关系,而三维脑脊液临床诊断技术的出现很好地解决了这个问题。它能直观地展示出脑脊液的全方位的三维形态,帮助医生更直接地发现病变位置、病变性质等重要信息。因此三维脑脊液临床诊断技术将是对脑积水临床检查治疗技术的有益补充。 本文主要研究了基于ITK的水平集医学图像分割算法和基于VTK的移动立方体三维重建算法,并在两者的基础上实现了脑脊液的分割和重建。其分割和重建的速度都比较快,效果良好 ...
杨剑炉
core  

Carbon‐Insertion‐Engineered WS2 Hierarchical Heterostructure Enabling Superior Sodium‐Ion Storage

open access: yesRare Metals, Volume 45, Issue 2, February 2026.
ABSTRACT Tungsten disulfide (WS2) is considered a promising anode material for sodium‐ion batteries (SIBs). However, its practical application is hindered by poor electrical conductivity, large volume changes during cycling, and sluggish ion diffusion kinetics, which lead to unsatisfactory electrochemical performance.
Xiuli Hu   +9 more
wiley   +1 more source

The Method Research of Integrated Robot Grinding Technology for Custom Femoral Prostheses [PDF]

open access: yes, 2017
影响非骨水泥假体长期稳定的因素是无菌松动,微动和应力遮蔽通过破坏假体近端的骨整合导致假体的无菌松动,而微动和应力遮蔽与假体的力传递相关。定制式假体的设计模型来源于病人股骨的CT数据,它建立了有限元模型与手术模型的一致性,通过有限元模型上的力传递分析,优化假体的设计和假体与髓腔的匹配,控制手术后假体上的力传递,避免假体近端大的微动和应力遮蔽而破坏假体在髓腔中的初期稳定性,促进假体近端的骨整合。针对定制式假体,发展一种新型的集成技术,形成定制式假体设计、有限元分析和制造一体化,特别是采用CAD/CAM ...
吴琪, 席文明, 庞浜, 管晓东
core   +1 more source

CT三维重建在鼻骨、鼻中隔骨折诊断中的应用价值

open access: yesZhongguo shiyan zhenduanxue, 2020
鼻外伤作为耳鼻咽喉-头颈外科的常见、多发的急诊创伤外科疾病之一[1],而鼻骨、鼻中隔骨折在颜面部外伤后尤为多发,传统的DR在鼻骨、鼻中隔骨折骨折诊断中存在确诊率低、误诊漏诊高的缺陷,随着CT三维重建技术的不断发展,不仅广泛应用于全身骨骼正常结构的诊断,而且对于鼻外伤时的鼻骨、鼻中隔、鼻窦、鼻额筛眶复合体骨折提供更加准确的诊断依据 ...
赵松花, 孙绍辉, 李红艳, 陈娜
doaj  

Metadiscourse and Teacher Moves for Supporting Student Reasoning in Linguistics Classroom Interactions

open access: yesInternational Journal of Applied Linguistics, Volume 36, Issue 1, Page 522-539, February 2026.
ABSTRACT This paper examines the features of metadiscourse across different teacher moves in university linguistics classroom discourse and the teaching strategies reflected in its use. The results reveal that teachers employ diverse metadiscourse during classroom interactions to support student reasoning.
Jingjie Li, Wenjie Hu
wiley   +1 more source

Application of a three-dimensional visualization technology for precise before retroperitoneal tumor surgery(Report of 15 cases) [PDF]

open access: yes, 2015
目的探讨三维可视化技术在腹膜后肿瘤术前评估中的应用价值。方法回顾性分析2011年3月至2013年12月厦门大学附属成功医院收治的15例腹膜后肿瘤病人的临床资料,应用三维可视化技术将病人术前二维CT图像进行三维可视化重建,通过观察肿瘤与腹腔脏器、腹部大血管之间的关系及测量肿瘤体积、手术模拟进行术前评估。对实施手术的病人,比较重建结果与实际手术的区别,对模拟切除肿瘤体积与实际切除肿瘤体积进行相关性分析。结果 15例病人三维可视化重建后图像清晰立体地显示肿瘤组织、腹腔实质脏器、腹腔大血管的解剖结构及毗邻关系 ...
李文岗   +7 more
core  

老年腰椎退行性病变螺旋CT表现及诊断

open access: yesZhongguo shiyan zhenduanxue, 2009
目的总结腰椎退行性病变的多层螺旋CT(MSCT)表现。方法300例诊断为腰椎退行性变的老年患者经MSCT扫描,分别行MPR、VRT、SSD三维重建图像,分析图像表现及不同重建方法的应用价值。结果老年腰椎退行性改变表现为椎体骨质增生、椎间盘膨出、椎间盘突出、"真空现象"、椎小关节病变、周围型的侧隐窝狭窄、退变性脊椎滑脱等。MPR可从轴位、冠状位、矢状位及任意角度的斜位重建同样高质量图像,较好地观察脊柱曲度、椎间盘病变、椎小关节、椎管内及椎间孔改变及椎体边缘性骨质增生 ...
王桂芝, 梁萍, 乔俊华, 刘纯岩
doaj  

The Dynamics of Coordination and Actor Movements in Advocacy Coalitions: A Theoretical Longitudinal Perspective Within the ACF

open access: yesPolitics &Policy, Volume 54, Issue 1, February 2026.
ABSTRACT This theoretical article examines the dynamics of stability and change in public policy coalitions using the Advocacy Coalition Framework as a foundation. We focus on how intra‐coalition and inter‐coalition coordination serves as a causal factor influencing the stability of coalition composition and the mobility of actors over time, especially
Dyego Alves da Silva   +2 more
wiley   +1 more source

CT三维成像诊断寰枢关节不全脱位的临床价值 [PDF]

open access: yes, 2004
目的 评价CT三维成像对寰枢关节不全脱位的显示及诊断价值 ,探讨最佳三维成像方法。 方法 回顾性分析 4 1例寰枢关节不全脱位的CT影像学表现 ,比较横断面图像、多层面重建 (multiplanarreformatting ,MPR)法、表面遮盖 (surfaceshadedisplay ,SSD)法、最大强度投影(maximumintensityprojection ,MIP)法及容积重建 (volumerendering,VR)法三维图像显示的病变情况。 结果 寰枢关节不全脱位 4 1例 ...
叶锋   +6 more
core  

Study on the Optimization of Internal Control and Camera Distortion Parameters Method Based on Matlab [PDF]

open access: yes, 2017
为了提高相机标定结果的准确度,文中就相机内参和畸变参数的优化方法进行了研究。在建立准确的相机成像及标定模型基础上,根据模型参数估计的具体推导步骤,利用最大似然估计法对得到的参数进行结果优化,然后通过修改镜头畸变模型重新计算参数得到最终结果。实验证明,应用文中提出的流程求解相机内参和畸变参数,简单快速、准确度高且实用性强。Study on the optimization method of camera internal and distortion parameters is conducted in
张世超, 李超
core   +1 more source

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