锥束CT检测成像仿真系统的研究与实现

设计并实现一个用于CT专业教学和科研的锥束CT检测成像仿真系统.该仿真系统能够模拟对CT设备的控制,生成正投影数据,重建被测物体,并能对重建结果进行三维显示.该系统包括如下关键技术:按真实比例对CT设备建模,实现了锥束CT工作过程的可视化;用场景图方法组织CT场景,简化了场景图形的管理方式;采用GPU加速CT正投影、图像重建和体绘制算法,在一定程度上解决了锥束CT大数据量快速计算问题.实验结果表明,该系统具有较快的运行速度,可满足用户交互操作的需要.

Research and Implementation of Cone-beam CT Simulation System

A cone-beam CT simulation system is developed for teaching and research in CT field. The system is equipped with four main functions, including the simulation of the CT device control, the generation of the forward projection data, the reconstruction of the CT image, and the visualization of the measured 3-D objects. Several key technologies are integrated in that system: the graphical models of the CT device are built in proportion to real industry CT system, a scene graph is employed to organize the scene conven-iently, and the forward projection algorithm, the image reconstruction algorithm and the visualization algorithm of the system are ac-celerated based on Graphics Processing Unit (GPU). Experiments show that the system runs efficiently so as to can be operated inter-actively by users.