He P
Department of Biomedical and Human Factors Engineering, Wright State University, Dayton, OH 45435, USA.
Biomed Sci Instrum. 1997;33:257-62.
An ultrasound scan and data acquisition system has been developed for computer-aided prosthetic socket design. The system performs compound scan at each level of the limb by rotating an ultrasound probe around the limb to acquire 36 B-scan images. From these B-scan images, a transverse cross section of the limb is reconstructed using a spatial compounding algorithm. By scanning the limb at many levels, a 3D limb model can be reconstructed. The compound process circumvents the problems associated with the large attenuation of bones and enables reconstruction of a complete image of bones and adjoining soft tissues. In addition, the compound process reduces ultrasound speckle and improves the image quality. These benefits however, can only be achieved through careful hardware and software design. In this paper, methods and algorithms for system calibration, fast and accurate compounding, and removal of the artifacts caused by limb movement during scan are discussed.
已开发出一种用于计算机辅助假肢接受腔设计的超声扫描与数据采集系统。该系统通过围绕肢体旋转超声探头在肢体的每个层面进行复合扫描，以获取36幅B扫描图像。利用空间复合算法从这些B扫描图像重建肢体的横截面。通过在多个层面扫描肢体，可以重建三维肢体模型。复合过程避免了与骨骼大幅衰减相关的问题，并能够重建骨骼及相邻软组织的完整图像。此外，复合过程减少了超声斑点并提高了图像质量。然而，这些益处只有通过精心的硬件和软件设计才能实现。本文讨论了系统校准、快速准确复合以及去除扫描期间肢体运动所产生伪像的方法和算法。
