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首页> 外文会议>Physics of Medical Imaging pt.3; Progress in Biomedical Optics and Imaging; vol.7 no.28 >Radial intensity projection for lumen: application to CT angiographic imaging
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Radial intensity projection for lumen: application to CT angiographic imaging

机译：管腔的径向强度投影：在CT血管造影成像中的应用

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For the diagnosis of lumen, such as plaque in the coronary and polyp in the colon, it is important to create the cross sectional image of tubular organ on the basis of luminal centerline (i.e., Curved Planar Reformation: CPR). However, since each CPR image has the only limited angle information, it may overlook objects of diagnostic importance. To overcome this limitation and improve diagnostic accuracy we have developed a method called Radial Intensity Projection for lumen (RIP) to create an image based on luminal centerline that integrates all directional information. RIP is executed as follows. At first image processing is performed on array of pixel in the orthogonal direction to a luminal centerline. Secondly, this image processing is performed repeatedly in the angle direction along a luminal centerline. Finally, RIP image, which incorporates all directional information based on luminal centerline, is created. In addition to developing the RIP method for the diagnosis of soft plaque, which is considered as one of the main causes of myocardial infarction, we have also developed the profile step imaging method (PSI). This is an algorithm for visualizing a level gradient point in the radial direction, paying attention to the fact that the gradient approaches zero at the region of soft plaque. We applied RIP method to the clinical image data of a coronary angiography, which has been scanned with the multi slice CT scanner. Using RIP method, it is possible to check the existence of calcified plaque present in the surrounding of a vessel wall without changing the view angle. We have also applied PSI method to the clinical image of a coronary angiography with a soft plaque. The PSI image overlaid on RIP image enables us to verify the high possibility of existing soft plaque. Moreover, the perspectively mapped RIP image to a half pipe object allows us to grasp the orientation of plaque more easily. RIP method is also effective for extended organs, such as peripheral vascular. Using RIP image as a guide for other image processing, it is possible to improve the effectiveness of diagnosis while simplify the diagnosis.
机译：为了诊断管腔，例如冠状动脉斑块和结肠息肉，重要的是要基于管腔中心线（即弯曲平面重建：CPR）创建管状器官的横截面图像。但是，由于每个CPR图像仅具有有限的角度信息，因此可能会忽略具有诊断重要性的对象。为了克服此限制并提高诊断准确性，我们开发了一种称为“管腔径向强度投影”（RIP）的方法，以基于管腔中心线创建图像，该图像集成了所有方向信息。 RIP执行如下。首先，在与腔中心线正交的方向上对像素阵列执行图像处理。其次，沿着腔中心线在角度方向上重复执行该图像处理。最后，创建了RIP图像，该图像结合了基于腔中心线的所有方向信息。除了开发用于诊断软斑的RIP方法（它被认为是心肌梗死的主要原因之一）之外，我们还开发了轮廓阶梯成像方法（PSI）。这是一种用于可视化径向上的水平梯度点的算法，要注意的事实是，在软斑块区域，梯度接近零。我们将RIP方法应用于已通过多层CT扫描仪扫描的冠状动脉造影的临床图像数据。使用RIP方法，可以在不改变视角的情况下检查血管壁周围是否存在钙化斑块。我们还将PSI方法应用于具有软斑块的冠状动脉造影的临床图像。覆盖在RIP图像上的PSI图像使我们能够验证现有软斑块的可能性。此外，透视图将RIP图像映射到半管对象使我们更容易掌握斑块的方向。 RIP方法对于周围器官等扩展器官也有效。使用RIP图像作为其他图像处理的指南，可以在简化诊断的同时提高诊断的效率。

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