脳神経外科ナビゲーション手術におけるフィデューシャルマーカの配置条件が脳内のナビゲーション精度分布に与える影響

概要

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In brain tumor surgery, the recent development of a neuronavigation system has enabled surgeons to understand the positional relationship between tumors and normal tissue. Accuracy of a navigation system is important for accurate resection of a brain tumor. Many factors influence the navigation accuracy;one of the important factors is the configuration of the fiducial markers. Because the configuration method varies among institutions, it is necessary to investigate the relationship between the configuration of fiducial markers and navigation accuracy. In this study, we evaluated the distribution of navigation accuracy inside the skull phantom for 2 different fiducial configurations: the scattered pattern and the clustered pattern. The scattered pattern was much more accurate than the clustered pattern for the entire phantom. Although the clustered pattern showed high accuracy on the fiducial points, the accuracy on the measurement points inside the phantom decreased with an increase in the distance from the fiducial markers. These results indicated that the sccatterd configration is appropriate for deep-seated or large tumor.