Fast and accurate automatic registration for MR-guided procedures using active microcoils
Fast and accurate automatic registration for MR-guided procedures using active microcoils
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DOI：
10.1109/tmi.2006.889748
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发表时间：
2007-03-01
影响因子：
10.6
通讯作者：
Nabavi, Arya
中科院分区：
文献类型：
--
作者：
Krueger, Sascha;Wolff, Stephan;Nabavi, Arya
提出了一种基于磁共振有源微线圈（有源标记）的快速、鲁棒、准确和自动配准技术，用于跟踪医疗器械的术前磁共振图像配准。这样就可以直接将位置测量系统集成到临床程序中。该方法可用于对准确性和易用性要求较高的临床应用（例如神经外科或骨科应用）的指导目的。活性标记物位置的确定被整合到实际MR成像扫描的准备阶段。该技术的特点是使用DICOM标准的通用接口，用于与链接到MR系统的导航工作站通信。主动标记的位置相对于光学定位测量系统（OPMS）的参考系统进行固定，从而建立了MR系统和OPMS的共配准。在一项模拟研究中，实现了0.9 +/- 0.1 mm的平均总体瞄准精度，并且与平行进行的手动对准测试（1.8 +/- 0.3 mm）获得的结果进行了比较。对于接受两种注册方法培训的测试人员，发现每个注册步骤的工作流程改进为3-6分钟。完全消除了人工交互的需要，从而避免了用户偏见，有利于临床常规使用。该方法提高了立体定向制导过程中跟踪设备的易用性。该方法最后在一项志愿者研究中得到了验证，该研究使用了一个梅菲尔德颅骨钳模型，该模型具有集成的主动和光学参考标记。
A fast, robust, accurate, and automatic registration technique based on magnetic resonance (MR) active microcoils (active markers) for registration of tracked medical devices to preprocedural MR-images is presented. This allows for a straightforward integration of position measurement systems into clinical procedures. The presented method is useful for guidance purposes in clinical applications with high demands on accuracy and ease-of-use (e.g., neurosurgical or orthopedic applications). The determination of the positions of the active markers is integrated into the preparation phase of the actual MR imaging scan. The technique features a generic interface using DICOM standards for communication with navigation workstations linked to an MR system. The position of the active markers is fixed with respect to a reference system of an optical positioning measurement system (OPMS) and thus the coregistration of the MR system and the OPMS is established. In a phantom study, a mean overall targeting accuracy of 0.9 +/- 0.1 mm was achieved and compared favorably to results obtained from manual registration tests (1.8 +/- 0.3 mm) carried out in parallel. For a test person trained for both registration methods, workflow improvements of 3-6 min per registration step were found. The need for manual interaction is entirely eliminated thus avoiding user-bias, which is advantageous for the usage in clinical routine. The method improves the ease-of-use of tracking equipment during stereotactic guidance. The method is finally demonstrated in a volunteer study using a model of a Mayfield skull clamp with integrated active and optical reference markers.