Please help me translate the following Chinese into English：本文利用脊柱模型进行表面配准误差精度实验如图6所示。表面配准误差为个性化标记物配准误差定义为相机识别到的个性化标记物在世界坐标系下的位置与配准完成后虚拟标记物在世界坐标下的坐标值之间的距离。执行一次配准后实现虚拟三维医学图像与模型相应手术部位配准融合返回一组误差值并改变模型的空间

This article conducts surface registration error accuracy experiments using a spinal model, as shown in Figure 6. The surface registration error is the personalized marker registration error, which is defined as the distance between the position of the personalized marker recognized by the camera in the world coordinate system and the coordinate value of the virtual marker in the world coordinate system after registration. After performing one registration, the virtual three-dimensional medical image is fused with the corresponding surgical site of the model, and a set of error values is returned. The spatial position of the model is then changed, and the above experimental steps are repeated to perform the second set of experiments. The error values of the markers are measured, and a total of ten experiments are conducted