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首页> 外文会议>International Workshop on Medical Imaging and Augmented Reality(MIAR 2004); 20040819-20040820; Beijing; CN >Freehand Cocalibration of Optical and Electromagnetic Trackers for Navigated Bronchoscopy
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Freehand Cocalibration of Optical and Electromagnetic Trackers for Navigated Bronchoscopy

机译：用于导航支气管镜的光学和电磁跟踪器的徒手协标

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摘要

Recent technical advances in electromagnetic (EM) tracking have facilitated the use of EM sensors in surgical interventions. Due to the susceptibility to distortions of the EM field when placed in close proximity to metallic objects, they require calibration in situ to maintain an acceptable degree of accuracy. In this paper, a freehand method is presented for calibrating electromagnetic position sensors by mapping the coordinate measurements to those from optical trackers. Unlike previous techniques, the proposed method allows for free movement of the calibration object, permitting C~2 continuity and interdependence between positional and angular corrections. The proposed method involves calculation of a mapping from {IR~3, SO(3)} to {IR~3, SO(3)} with radial basis function interpolation based on a modified distance metric. The system provides efficient distortion correction of the EM field, and is applicable to clinical situations where a rapid calibration of EM tracking is required.
机译：电磁（EM）跟踪方面的最新技术进步促进了在外科手术中使用EM传感器。由于电磁场在靠近金属物体放置时容易变形，因此需要现场校准以保持可接受的精度。在本文中，提出了一种徒手绘制的方法，可以通过将坐标测量值映射到光学跟踪器的坐标测量值来校准电磁位置传感器。与先前的技术不同，所提出的方法允许校准对象自由移动，从而允许C〜2连续性以及位置和角度校正之间的相互依赖性。所提出的方法涉及基于径向距离函数内插基于修正的距离度量来计算从{IR_3，SO（3）}到{IR_3，SO（3）}的映射。该系统可对EM场进行有效的畸变校正，适用于需要对EM跟踪进行快速校准的临床情况。

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