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Spleen segmentation and volume estimation using a gradient vector flow (GVF) based snake model.

机译:使用基于梯度矢量流(GVF)的蛇模型进行脾脏分割和体积估计。

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摘要

Computing volumes of abdominal soft organs such as liver, spleen, etc. is important in clinical diagnosis. Splenic injury is the most common soft organ injury seen in Level 1 trauma centers, most often resulting from blunt abdominal trauma sustained in motor vehicle collisions. For soft organ volumetry, different imaging techniques such as Ultrasonography (US), Computed Tomography (CT), and Magnetic Resonance (MR) imaging have been used, all of which have been performed by using different measurement techniques and yield variable results. Cross-sectional imaging used for volumetric assessment requires applications of mathematical algorithms for segmentation involving manual or automated segmentation of the organs of interest. In this thesis CT images are used and a new kind of snake model that permits the snake model to start far from the object, in our case the spleen and yet still draws it towards the object, and forces it into boundary concavities. The proposed snake model is based on a new type of external force field, called gradient vector flow (GVF) which is computed as a spatial diffusion of the gradient of an edge map derived from the image. This computation causes diffuse forces to exist far from the object, and crisp force vectors near the edges. Volumetric information about abdominal organs is not routinely generated for clinical use mainly because accurate, reliable, and operationally practical segmentation algorithms are not readily available. Our system has focused on reliable segmentation of the spleen and computation of its volume.
机译:计算腹部软器官(例如肝脏,脾脏等)的体积在临床诊断中很重要。脾脏损伤是在1级创伤中心见到的最常见的软器官损伤,最常见的原因是由于机动车碰撞中遭受的钝性腹部损伤。对于软器官容积检查,已使用了不同的成像技术,例如超声(US),计算机断层扫描(CT)和磁共振(MR)成像,所有这些技术都是通过使用不同的测量技术来完成的,并产生可变的结果。用于体积评估的横截面成像需要应用数学算法进行分割,包括手动或自动分割目标器官。在本文中,使用了CT图像和一种新型的蛇模型,该蛇模型允许蛇模型远离对象(在我们的情况下是脾脏,但仍将其拉向对象),并迫使其进入边界凹面。所提出的蛇模型基于一种新型的外力场,称为梯度矢量流(GVF),其计算为从图像得出的边缘图的梯度的空间扩散。这种计算导致远离物体存在扩散力,并且在边缘附近存在清晰的力向量。由于通常不容易获得准确,可靠且可操作的分割算法,因此通常不会为临床使用常规生成有关腹部器官的体积信息。我们的系统专注于脾脏的可靠分割及其体积的计算。

著录项

  • 作者

    Saiprasad, Ganesh.;

  • 作者单位

    University of Maryland, Baltimore County.;

  • 授予单位 University of Maryland, Baltimore County.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 M.S.
  • 年度 2008
  • 页码 109 p.
  • 总页数 109
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

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