中文摘要：

Freehand三维超声成像系统因其扫描方式自由、能提供更大的成像视角和更高的图像分辨率等优点,比较符合医生习惯和手术室环境,成为近年来超声影像引导介入手术的主要研究方向。Freehand三维超声从一系列不规则的二维B超图像入手,重构器脏结构的三维体数据,并进行三维渲染显示。体数据重建是Freehand三维超声成像系统的关键技术,对提高重建图像质量有着重要的作用。对Freehand三维超声体数据的重建算法进行归纳和分类,比较分析其中的典型算法,最后对Freehand三维超声体数据重建算法的研究状况和未来的发展方向进行展望。

英文摘要：

Freehand 3D ultrasound imaging system is more in line with doctor＇s habits and the surrounding of operating room for its simple, useful, wider field of view and higher image resolution, which makes it one of the research focuses in the field of guidance of interventional surgery based on ultrasound imaging. Freehand 3D ultrasound produces 3D volume data of anatomical objects from a sequence of irregularly located 2D B-mode ultrasound images, and renders the reconstructed 3D volume data. Volume reconstruction is one of the key procedures in freehand 3D ultrasound imaging system and plays an important role in improving the reconstructed image quality. This paper summed up three kinds of volume reconstruction methods for freehand 3D ultrasound image, incuding voxel-based method, pixel-based method and function-based method. After that, some algorithms are presented with their merits and drawbacks. Finally, the research progress is summarized and future research directions are suggested.