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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 track the movement of target area caused by respiratory motion and tissue deformation in real time by introducing all-digital real-time infrared positioning system, acquiring two-dimensional B-mode ultrasound images and reconstructing three-dimensional ultrasound system. Methods The experiments were performed by installing three infrared positioning pellets (non-equilateral) on a two-dimensional ultrasound probe, tracking the position of the probe in real time, mapping the two-dimensional ultrasound image into the three-dimensional space, and then acquiring the image measurement through the triangular pyramid model According to the geometrical position relationship, combined with the properties of B-ultrasound image, the three-dimensional ultrasonic membrane data was established. The experiment was based on the cubic model as the experimental membrane and the water tank as the experimental environment. Results Experiments show that the two-dimensional ultrasound and infrared positioning system can quickly reconstruct three-dimensional ultrasound. Reconstructing the three pyramidal shapes and directions of the membrane body is consistent with the actual membrane body. The reconstruction accuracy is accurate, fast and convenient. Conclusion The three-dimensional ultrasound reconstruction technique proposed in this paper can acquire calibration and three-dimensional ultrasound quickly and conveniently by acquiring two-dimensional ultrasound images combined with real-time tracking infrared positioning equipment, and has high reconstruction accuracy.