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首页> 外文会议>Conference on Visualization, Image-Guided Procedures, and Display: Medical Imaging 2004; 20040215-20040217; San Diego,CA; US >A novel method for pulmonary emboli visualization from high-resolution CT images
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A novel method for pulmonary emboli visualization from high-resolution CT images

机译：从高分辨率CT图像可视化肺栓子的新方法

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摘要

Pulmonary Embolism (PE) is one of the most common causes of unexpected death in the US. The recent introduction of 16-slice Computed Tomography (CT) machines allows the acquisition of very high-resolution datasets. This has made CT a more attractive means for diagnosing PE, especially for previously difficult to identify small subsegmental peripheral emboli. However, the large size of these datasets makes it desirable to have an automated method to help radiologists focus directly on potential candidates that might otherwise be overlooked. We propose a novel method to highlight potential PEs on a 3D representation of the pulmonary arterial tree. First lung vessels are segmented using mathematical morphology techniques. The density values inside the vessels are then used to color the outside of a Shaded Surface Display (SSD) of the vessel tree. As PEs are clots of significantly lower Hounsfield Unit (HU) values than surrounding contrast-enhanced blood, they appear as salient contrasted patches in this 3D rendering. During preliminary testing on 6 datasets 19 PEs out of 22 were detected (sensitivity 86%) with 2 false positives for every true positive (Positive Predictive Value 33%).
机译：肺栓塞（PE）是美国意外死亡的最常见原因之一。最近引入的16层计算机断层扫描（CT）机器允许获取非常高分辨率的数据集。这使CT成为诊断PE的一种更具吸引力的手段，尤其是对于以前难以识别的小节段性周围血栓的患者。但是，这些数据集的规模很大，因此希望有一种自动化的方法来帮助放射科医生直接关注可能会被忽略的潜在候选物。我们提出了一种新颖的方法来突出肺动脉树的3D表示上的潜在PE。使用数学形态学技术对第一个肺血管进行分割。然后，将容器内部的密度值用于为容器树的阴影表面显示（SSD）的外部着色。由于PE的Hounsfield Unit（HU）值明显低于周围对比增强的血液凝块，因此它们在此3D渲染中显示为明显的对比斑块。在6个数据集上进行初步测试期间，检测到22个PE中的19个（灵敏度86％），每个真实阳性都有2个假阳性（阳性预测值33％）。

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