Deforming a preoperative volume to represent the intraoperative scene.
Deforming a preoperative volume to represent the intraoperative scene.
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DOI：
10.1002/igs.10034
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发表时间：
2002-01-01
期刊：
影响因子：
--
通讯作者：
Hawkes, D J
中科院分区：
文献类型：
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作者：
Penney, G P;Little, J A;Hawkes, D J
软组织变形可能是一个问题，如果手术前的模式被用来帮助指导手术或介入手术。我们提出了一种方法，可以扭曲术前CT图像来表示介入性透视图像所显示的术中场景。该方法是2D-3D图像配准算法和变形算法的新组合，该算法允许将刚体合并到基于径向基函数的非线性变形中。2D-3D配准算法用于获得术前和术中图像之间的相对脊椎运动信息。变形算法使用这些信息来扭曲术前图像，以更准确地表示术中场景。使用的是主动脉支架植入过程中的图像。在我们的实验中观察到的变形是腰椎在四个椎骨的距离上弯曲5度，延长5毫米。扭曲CT体积中的椎体位置比术前CT体积中的椎体位置更能准确地反映术中场景。虽然我们没有评估软组织结构配准准确性的金标准，但这种结构在扭曲的CT体积内的位置在视觉上看起来很逼真。
Soft-tissue deformation can be a problem if a preoperative modality is used to help guide a surgical or interventional procedure. We present a method that can warp a preoperative CT image to represent the intraoperative scene shown by an interventional fluoroscopy image. The method is a novel combination of a 2D-3D image registration algorithm and a deformation algorithm that allows rigid bodies to be incorporated into a nonlinear deformation based on radial basis functions. The 2D-3D registration algorithm is used to obtain information on relative vertebral movements between preoperative and intraoperative images. The deformation algorithm uses this information to warp the preoperative image to represent the intraoperative scene more accurately. Images from an aortic stenting procedure were used. The observed deformation in our experiment was 5 degrees flexion and 5 mm lengthening of the lumbar spine over a distance of four vertebrae. The vertebral positions in the warped CT volume represent the intraoperative scene more accurately than in the preoperative CT volume. Although we had no gold standard with which to assess the registration accuracy of soft-tissue structures, the position of such structures within the warped CT volume appeared visually realistic.