基于红外定位系统三维超声的研究

Research of three-dimensional ultrasound system based on infra positioning system

目的通过引入全数字的实时红外定位系统,同时采集二维B超图像,重建三维超声系统,来实时跟踪由于呼吸运动和组织变形导致的靶区的运动。方法实验主要通过在二维B超探头上安装3个红外定位小球(非等边),实时跟踪探头的位置,将二维超声图像映射到三维空间,然后通过三棱锥模型多次采集图像测量其几何位置关系,结合B超图像的性质,建立三维超声膜体数据,实验以立方体模型作为实验膜体,同时以水槽作为实验环境。结果实验证明二维超声及红外定位系统可以快速重建三维超声,重建膜体的三条棱锥形状及方向与实际的膜体相符合,重建精度准确,快速便捷。结论实验提出的三维超声重建技术,采集二维超声图像同时结合实时跟踪的红外定位设备,可以快速方便地实现定标及三维超声的建立,并且具有较高的重建准确性。

Objective To reconstruct three-dimensional ultrasound system by the real-time infra positioning system and collection of two-dimensional ultrasound images, and timely track the target area by breathing and respiration movement. Methods Three-dimensional ultrasound data was constructed based on two-dimensional ultrasound probe installed with three infrared positioning balls（non-equilateral）, which tracked the position of images, real-time mapping the images into the three dimensional space. The cube model was used as phantom, and whole experimental environment was conducted in sink. Results Three-dimensional ultrasound system was rapidly reconstructed by the proposed method, and the reconstruction of triangular pyramid was fitted for real phantom with high reconstruction precision. Conclusion It is demonstrated that the real-time tracking technique can realize calibration and reconstruction of three-dimensional ultrasound rapidly and easily, and it also possesses high reconstruction precision.