Kawchuk G N, Elliott P D
McCaig Centre for Joint Injury and Arthritis Research, Alberta, Canada.
Ultrasound Med Biol. 1998 Jan;24(1):105-11. doi: 10.1016/s0301-5629(97)00241-x.
Biomechanical features of soft tissue are commonly investigated by indentation, a procedure where a blunt probe is advanced and the ensuing deformation of the tissue surface recorded. If it were possible to visualize subsurface anatomy during the indentation process, biomechanical investigation of internal tissue features might be feasible. The purpose of this experiment was to determine the accuracy of ultrasonically-derived measures of displacement obtained during indentation testing of an ultrasonic phantom. Using a 5-MHz sector transducer mounted to an automated indentation device, ultrasonic estimates of distance between a stationary target surface and the moving ultrasonic transducer were obtained and validated to a criterion. Depending on the method used to locate the target surface on the resulting B-mode image, the mean displacement error ranged from 14.37% to 22.05%. Use of this protocol for human tissue assessment, in vivo or otherwise, may be appropriate if the displacements of interest are greater than the error of the procedure.
软组织的生物力学特性通常通过压痕法进行研究，该方法是将钝头探针推进，并记录组织表面随之产生的变形。如果在压痕过程中能够可视化皮下解剖结构，那么对内部组织特征进行生物力学研究可能是可行的。本实验的目的是确定在超声体模压痕测试过程中获得的超声位移测量值的准确性。使用安装在自动压痕装置上的5兆赫扇形换能器，获得了固定目标表面与移动超声换能器之间距离的超声估计值，并与一个标准进行了验证。根据在所得B模式图像上定位目标表面所使用的方法，平均位移误差范围为14.37%至22.05%。如果感兴趣的位移大于该方法的误差，那么使用该方案对人体组织进行体内或其他方式的评估可能是合适的。
