Medical University of South Carolina, Charleston, 29425, USA.
Brain Stimul. 2009 Jan;2(1):50-4. doi: 10.1016/j.brs.2008.09.006.
The International 10-20 system is a method for standardized placement of electroencephalogram (EEG) electrodes. The 10-20 system correlates external skull locations with the underlying cortical areas. This system accounts for variability in patient skull size by using certain percentages of the circumference and distances between four basic anatomical landmarks. This 10-20 system has recently been used in transcranial magnetic stimulation (TMS) research for locating specific cortical areas. In the treatment of depression (and some types of pain), the desired placement of the TMS coil is often above the left dorsalateral prefrontal cortex (DLPFC) which corresponds to the F3 location given by the 10-20 system. However, for an administrator with little experience with the 10-20 system, the numerous measurements and calculations can be excessively time-consuming. Additionally, with more measurements comes more opportunity for human error. For this reason we have developed a new, simpler and faster way to find the F3 position using only three skull measurements. In this paper, we describe and illustrate the application of the new F3 location system, provide the formulas used in the calculation of the F3 position, and summarize data from 10 healthy adults. After using both the International 10-20 system and this new method, it appears that the new method is sufficiently accurate; however, future investigations may be warranted to conduct more in dept analyses of the method's utility and potential limitations. This system requires less time and training to find the optimal position for prefrontal coil placement and it saves considerable time compared to the 10-20 EEG system.
国际 10-20 系统是一种标准化放置脑电图（EEG）电极的方法。10-20 系统将外部颅骨位置与下面的皮质区域相关联。该系统通过使用头部周长和四个基本解剖学标志之间的距离的特定百分比来考虑患者颅骨大小的变化。这个 10-20 系统最近在经颅磁刺激（TMS）研究中用于定位特定的皮质区域。在治疗抑郁症（和某些类型的疼痛）时，TMS 线圈的理想放置位置通常在左侧背外侧前额叶皮质（DLPFC）上方，这与 10-20 系统给出的 F3 位置相对应。然而，对于一个对 10-20 系统没有多少经验的管理员来说，大量的测量和计算可能会非常耗时。此外，测量次数越多，人为错误的机会就越多。出于这个原因，我们开发了一种新的、更简单和更快的方法，只需使用三个颅骨测量值即可找到 F3 位置。在本文中，我们描述并说明了新的 F3 位置系统的应用，提供了计算 F3 位置使用的公式，并总结了 10 名健康成年人的数据。使用国际 10-20 系统和这个新方法后，似乎新方法足够准确；然而，可能需要进行进一步的调查，以对该方法的实用性和潜在局限性进行更深入的分析。与 10-20 EEG 系统相比，这种系统在找到前额叶线圈放置的最佳位置时需要更少的时间和培训，并且可以节省大量时间。
