Baert Shirley A M, van de Kraats Everine B, van Walsum Theo, Viergever Max A, Niessen Wiro J
University Medical Center Utrecht, Image Sciences Institute, 3584 CX Utrecht, The Netherlands.
IEEE Trans Med Imaging. 2003 Oct;22(10):1252-8. doi: 10.1109/TMI.2003.817791.
Using three-dimensional rotational X-ray angiography (3DRA), three-dimensional (3-D) information of the vasculature can be obtained prior to endovascular interventions. However, during interventions, the radiologist has to rely on fluoroscopy images to manipulate the guide wire. In order to take full advantage of the 3-D information from 3DRA data during endovascular interventions, a method is presented that yields an integrated display of the position of the guide wire and vasculature in 3-D. The method relies on an automated method that tracks the guide wire simultaneously in biplane fluoroscopy images. Based on the calibrated geometry of the C-arm, the 3-D guide-wire position is determined and visualized in the 3-D coordinate system of the vasculature. The method is evaluated in an intracranial anthropomorphic vascular phantom. The influence of the angle between projections, distortion correction of the projection images, and accuracy of geometry knowledge on the accuracy of 3-D guide-wire reconstruction from biplane images is determined. If the calibrated geometry information is used and the images are corrected for distortion, a mean distance to the reference standard of 0.42 mm and a tip distance of 0.65 mm is found, which means that accurate guide-wire reconstruction from biplane images can be performed.
使用三维旋转X射线血管造影（3DRA），可以在血管内介入治疗之前获得血管系统的三维（3-D）信息。然而，在介入治疗期间，放射科医生必须依靠荧光透视图像来操控导丝。为了在血管内介入治疗期间充分利用来自3DRA数据的三维信息，本文提出了一种方法，该方法能够在三维空间中对导丝和血管系统的位置进行综合显示。该方法依赖于一种自动方法，该方法可在双平面荧光透视图像中同时跟踪导丝。基于C形臂的校准几何结构，确定三维导丝位置并在血管系统的三维坐标系中进行可视化。该方法在颅内人体血管模型中进行了评估。确定了投影之间的角度、投影图像的畸变校正以及几何知识的准确性对从双平面图像重建三维导丝准确性的影响。如果使用校准的几何信息并对图像进行畸变校正，则与参考标准的平均距离为0.42毫米，尖端距离为0.65毫米，这意味着可以从双平面图像进行准确的导丝重建。
