中文说明：本代码是基于DICOM格式的CT图像进行重建，首先对CT图像进行排序，后用体绘制的方式将图像进行三维绘制。
English Description：
This code is based on the DICOM format of CT image reconstruction, first of all, the CT images are sorted, and then volume rendering method is used to draw the three-dimensional image.