Ultrasonic wave velocity measurement in small polymeric and cortical bone specimens
Ultrasonic wave velocity measurement in small polymeric and cortical bone specimens
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DOI：
10.1115/1.2796085
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发表时间：
1997-08-01
影响因子：
1.7
通讯作者：
Vanderby, R
中科院分区：
文献类型：
--
作者：
Kohles, SS;Bowers, JR;Vanderby, R
改进了一个系统，用于测定小皮质骨标本中的体超声波传播速度。使用陶瓷，压电20和5 MHz的换能器，分别测量纵向和剪切波传播。通过测量系统延迟时间，改进了脉冲传输技术的结果。使用聚甲醛、聚苯乙烯-丁二烯和高密度聚乙烯的小样本来量化该系统的精确度和准确度。这些聚合物材料具有已知的声学特性，与皮质骨的传播速度相似，并且样品不均匀性最小。对纵向和横向试样尺寸对传播时间的依赖性进行了量化。为了确认小皮质骨样本（< 1.0 mm）中纵波传播的一致性，从正常大鼠股骨制备切割样本。最后，从10个正常大鼠股骨中的每一个制备皮质样品，并测量杨氏模量（E-ii）、剪切模量（G（ij））和泊松比（nu（ij））。对于所有样本（骨、聚甲醛、聚苯乙烯-丁二烯和高密度聚乙烯），在小于0.4 mm的尺寸范围内，传播时间和距离之间保持强线性相关性（R-2 > 0.997）。聚甲醛、聚苯乙烯-丁二烯和高密度聚乙烯的结果准确度在文献报道值的5%以内。测量重复性（精度）随着波传输距离（传播尺寸）的增加而提高。未检测到横向尺寸引起的统计学显著影响。
A system was refined for the determination of the bulk ultrasonic wave propagation velocity in small cortical bone specimens. Longitudinal and shear wave propagations were measured using ceramic, piezoelectric 20 and 5 MHz transducers, respectively. Results of the pulse transmission technique were refined via the measurement of the system delay time. The precision and accuracy of the system were quantified using small specimens of polyoxymethylene, polystyrene-butadiene, and high-density polyethylene. These polymeric materials had known acoustic properties, similarity of propagation velocities to cortical bone, and minimal sample inhomogeneity. Dependence of longitudinal and transverse specimen dimensions upon propagation times was quantified. To confirm the consistency of longitudinal wave propagation in small cortical bone specimens (< 1.0 mm), cut-down specimens were prepared from a normal rat femur. Finally, cortical samples were prepared from each of ten normal rat femora, and Young's moduli (E-ii), shear moduli (G(ij)), and Poisson ratios (nu(ij)) were measured. For all specimens (bone, polyoxymethylene, polystyrene-butadiene, and high-density polyethylene), strong linear correlations (R-2 > 0.997) were maintained between propagation time and distance throughout the size ranges down to less than 0.4 mm. Results for polyoxymethylene, polystyrene-butadiene, and high-density polyethylene were accurate to within 5 percent of reported literature values. Measurement repeatability (precision) improved with an increase in the wave transmission distance (propagating dimension). No statistically significant effect due to the transverse dimension was detected.