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首页> 外文会议>International conference on medical imaging computing and computer-assisted intervention >Exploiting Partial Structural Symmetry for Patient-Specific Image Augmentation in Trauma Interventions
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Exploiting Partial Structural Symmetry for Patient-Specific Image Augmentation in Trauma Interventions

机译：利用局部结构对称性在创伤干预中增强患者特定的图像

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In unilateral pelvic fracture reductions, surgeons attempt to reconstruct the bone fragments such that bilateral symmetry in the bony anatomy is restored. We propose to exploit this "structurally symmetric" nature of the pelvic bone, and provide intra-operative image augmentation to assist the surgeon in repairing dislocated fragments. The main challenge is to automatically estimate the desired plane of symmetry within the patient's pre-operative CT. We propose to estimate this plane using a non-linear optimization strategy, by minimizing Tukey's biweight robust estimator, relying on the partial symmetry of the anatomy. Moreover, a regularization term is designed to enforce the similarity of bone density histograms on both sides of this plane, relying on the biological fact that, even if injured, the dislocated bone segments remain within the body. The experimental results demonstrate the performance of the proposed method in estimating this "plane of partial symmetry" using CT images of both healthy and injured anatomy. Examples of unilateral pelvic fractures are used to show how intra-operative X-ray images could be augmented with the forward-projections of the mirrored anatomy, acting as objective road-map for fracture reduction procedures.
机译：在单侧骨盆骨折复位中，外科医生试图重建骨碎片，以使骨解剖结构中的双侧对称性得以恢复。我们建议利用骨盆骨的这种“结构对称”性质，并提供术中图像增强功能，以协助外科医生修复脱臼的碎片。主要挑战是自动估计患者术前CT内所需的对称平面。我们建议使用非线性优化策略来估计该平面，方法是根据解剖结构的局部对称性，通过最小化Tukey的双权稳健估计器。此外，正则化术语的设计是基于生物学事实，即即使受伤，脱位的骨节段仍保留在体内，从而在该平面的两侧强制实施骨密度直方图的相似性。实验结果表明，使用健康和受伤解剖结构的CT图像，该方法在估计“部分对称平面”中的性能。单侧骨盆骨折的例子被用来显示术中X射线图像如何通过镜像解剖结构的正投影得到增强，从而成为减少骨折的客观路线图。

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