人体长骨振动的在体测试

Measurement of vibration in human long bones in vivo

振动分析技术用来诊断骨病和估计骨折愈合程度的可行性已得到证实。测试时常用的激振方式有电动、人工和超声等,拾振装置有传声器、力传感器和加速度计等。文章采用医用叩诊锤激振、双加速度计拾振,在不同情况下在体测试了人体长骨的振动。通过分析测试信号的功率谱及传递函数,发现骨组织中振动传播具有方向性,拾振器的质量、测点及激振点位置对测试结果有影响。实际应用中应选用质量较小的拾振器,且应尽量保持待测肢与对照肢的测试条件一致。

Feasibility of vibration analysis as a tool for diagnosis of bone disease and assessment of bone fracture healing has been proved. Vibration in bone is usually excited by electromotion, manpower or ultrasound, and usually picked up by microphones, force sensors or accelerometers. In this paper, vibration in human long bone was measured in vivo with a medical impact hammer and two accelerometers under different conditions. By analyzing the power spectrum and transfer function of detected signals, it has been found that the property of vibration propagation in bone is anisotropy, and the quality of the sensor to pick up vibration, the sites of impact and detection have an effect on experimental results. In practice, light sensors should be used, and the measurement conditions should be kept consistent for the tested limb and the contrasted limb.