Yaniv Ziv, Wilson Emmanuel, Lindisch David, Cleary Kevin
Imaging Science and Information Systems Center, Department of Radiology, Georgetown University Medical Center, Washington, DC 20057, USA.
Med Phys. 2009 Mar;36(3):876-92. doi: 10.1118/1.3075829.
When choosing an electromagnetic tracking system (EMTS) for image-guided procedures several factors must be taken into consideration. Among others these include the system's refresh rate, the number of sensors that need to be tracked, the size of the navigated region, the system interaction with the environment, whether the sensors can be embedded into the tools and provide the desired transformation data, and tracking accuracy and robustness. To date, the only factors that have been studied extensively are the accuracy and the susceptibility of EMTSs to distortions caused by ferromagnetic materials. In this paper the authors shift the focus from analysis of system accuracy and stability to the broader set of factors influencing the utility of EMTS in the clinical environment. The authors provide an analysis based on all of the factors specified above, as assessed in three clinical environments. They evaluate two commercial tracking systems, the Aurora system from Northern Digital Inc., and the 3D Guidance system with three different field generators from Ascension Technology Corp. The authors show that these systems are applicable to specific procedures and specific environments, but that currently, no single system configuration provides a comprehensive solution across procedures and environments.
在为图像引导手术选择电磁跟踪系统（EMTS）时，必须考虑几个因素。其中包括系统的刷新率、需要跟踪的传感器数量、导航区域的大小、系统与环境的相互作用、传感器是否可以嵌入工具并提供所需的变换数据，以及跟踪精度和鲁棒性。迄今为止，唯一得到广泛研究的因素是EMTS的精度以及对铁磁材料引起的失真的敏感性。在本文中，作者将重点从系统精度和稳定性分析转移到影响EMTS在临床环境中效用的更广泛因素集。作者基于上述所有因素进行了分析，这些因素是在三种临床环境中评估的。他们评估了两种商业跟踪系统，北方数字公司的Aurora系统，以及阿森松技术公司的带有三种不同场发生器的3D Guidance系统。作者表明，这些系统适用于特定的手术和特定的环境，但目前，没有单一的系统配置能在所有手术和环境中提供全面的解决方案。
