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首页> 外文期刊>Journal of Digital Imaging >A Method for Computing General Sacroiliac Screw Corridors Based on CT Scans of the Pelvis
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A Method for Computing General Sacroiliac Screw Corridors Based on CT Scans of the Pelvis

机译：基于骨盆CT扫描的Sa骨通用螺旋通道计算方法

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摘要

Sacroiliac (SI) joint dislocations and sacral fractures of the pelvis can be stabilized by SI screws; however, screw insertion into a sacral isthmus region is risky for the adjacent neurovascular structures. Therefore, shape analyses of general SI screw corridors or safety zones are of great surgical interest; however, before such analyses can be conducted, a method for computing 3D models of general SI corridors from routine clinical computed tomography (CT) scans has to be developed. This work describes a method for determining general corridors in pelvic CT data for accurate screw placement into the first sacral body. The method is implemented with the computer language C++. The pelvic CT data are preprocessed before the presented algorithm computes a model of the 3D corridor volume. Additionally, the two most important parameters of the algorithm, the raster step and the virtual SI screw diameter, have been characterized. The result of the work is an algorithm for computing general SI screw corridors and its implementation. Additionally the influences of two important parameters, the raster step and the SI screw diameter, on corridor volume precision and computation time have been quantified for the test sample. We conclude that the method can be used in further corridor shape analyses with a large number of pelvic CT data sets for investigating general SI screw corridors and clinical consequences for the placements of the screws. Implementation of the presented software algorithm could also enhance performance of computer-assisted surgery in the near future.
机译：SI骨（SI）关节脱位和骨盆的骨骨折可通过SI螺钉稳定。但是，将螺钉插入a峡部区域对于相邻的神经血管结构是有风险的。因此，一般SI螺钉通道或安全区域的形状分析具有很大的手术价值。但是，在进行此类分析之前，必须开发一种用于通过常规临床计算机断层扫描（CT）扫描来计算一般SI走廊的3D模型的方法。这项工作描述了一种方法，用于确定骨盆CT数据中的一般通道，以将螺钉准确地放置到第一骨中。该方法用计算机语言C ++实现。在提出的算法计算3D走廊容积模型之前，对骨盆CT数据进行预处理。此外，算法的两个最重要的参数，光栅步长和虚拟SI螺丝直径，已被表征。这项工作的结果是一种用于计算通用SI螺丝廊道的算法及其实现。此外，已经量化了两个重要参数（光栅步长和SI螺钉直径）对走廊体积精度和计算时间的影响，用于测试样品。我们得出的结论是，该方法可用于具有大量骨盆CT数据集的进一步的通道形状分析中，以研究一般的SI螺钉通道以及螺钉放置的临床后果。所提出的软件算法的实施还可以在不久的将来提高计算机辅助手术的性能。

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