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首页> 外文期刊>Journal of Biomechanics >Marker Configuration Model-Based Roentgen Fluoroscopic Analysis
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Marker Configuration Model-Based Roentgen Fluoroscopic Analysis

机译：基于标记物配置模型的X射线荧光分析

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It remains unknown if and how the polyethylene bearing in mobile bearing knees moves during dynamic activities with respect to the tibial base plate. Marker Configuration Model-Based Roentgen Fluoroscopic Analysis (MCM-based RFA) uses a marker configuration model of inserted tantalum markers in order to accurately estimate the pose of an implant or bone using single plane Roentgen images or fluoroscopic images. The goal of this study is to assess the accuracy of (MCM-Based RFA) in a standard fluoroscopic set-up using phantom experiments and to determine the error propagation with computer simulations.The experimental set-up of the phantom study was calibrated using a calibration box equipped with 600 tantalum markers, which corrected for image distortion and determined the focus position. In the computer simulation study the influence of image distortion, MC-model accuracy, focus position, the relative distance between MC-models and MC-model configuration on the accuracy of MCM-Based RFA were assessed.The phantom study established that the in-plane accuracy of MCM-Based RFA is 0.1 mm and the out-of-plane accuracy is 0.9 mm. The rotational accuracy is 0.1 degrees. A ninth-order polynomial model was used to correct for image distortion.Marker-Based RFA was estimated to have, in a worst case scenario, an in vivo translational accuracy of 0.14mm (x-axis), 0.17mm (y-axis), 1.9mm (z-axis), respectively, and a rotational accuracy of 0.3 degrees. When using fluoroscopy to study kinematics, image distortion and the accuracy of models are important factors, which influence the accuracy of the measurements.MCM-Based RFA has the potential to be an accurate, clinically useful tool for studying kinematics after total joint replacement using standard equipment. (c) 2004 Elsevier Ltd. All rights reserved.
机译：在动态活动过程中，相对于胫骨底板，活动轴承膝中的聚乙烯轴承是否以及如何移动仍然未知。基于标记物配置模型的X射线荧光检查（基于MCM的RFA）使用插入的钽标记物的标记物配置模型，以便使用单平面Roentgen图像或荧光检查图像准确估计植入物或骨骼的姿势。这项研究的目的是通过幻影实验评估标准荧光镜设置中基于（MCM的RFA）的准确性，并通过计算机仿真确定误差传播。装有600个钽标记的校准箱，可以校正图像失真并确定焦点位置。在计算机仿真研究中，评估了图像失真，MC模型准确性，焦点位置，MC模型之间的相对距离以及MC模型配置之间的距离对基于MCM的RFA准确性的影响。基于MCM的RFA的平面精度为0.1 mm，面外精度为0.9 mm。旋转精度为0.1度。使用九阶多项式模型校正图像失真。在最坏的情况下，估计基于标记的RFA的体内平移精度为0.14mm（x轴），0.17mm（y轴）分别为1.9mm（z轴）和0.3度的旋转精度。当使用荧光透视法研究运动学时，图像失真和模型的准确性是影响测量准确性的重要因素。基于MCM的RFA有望成为一种精确，临床上有用的工具，用于在使用标准的全关节置换后研究运动学设备。 （c）2004 Elsevier Ltd.保留所有权利。

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