Determination of Bone Trabeculae Modulus—An Ultrasonic Scanning and MicroCT (μCT) Imaging Combination Approach |
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Authors: | J C M Teo E Y L Teo V P W Shim S H Teoh |
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Institution: | (1) National University of Singapore, Singapore, 117576, Singapore |
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Abstract: | To date, there is no method to measure non-destructively the modulus of trabeculae within cancellous bone, whilst retaining
its structural integrity. In this study ultrasonic scanning, coupled with microCT imaging, is employed to determine trabeculae
modulus along the three major anatomical axes non-destructively. The proposed method allows cancellous bone specimens to remain
intact, for possible use in subsequent studies. Volume rendering of the microCT images allows three-dimensional visualization
of cancellous bone specimens to be tested. This facilitates trabeculae selection and accurate measurement of distance traveled
by the ultrasonic wave, thus yielding a good degree of confidence in the acoustic velocity measured. For all the three principal
anatomical directions, the measured acoustic speeds ranged from 2,115 to 3,077 m/s, giving an average of 2,505 m/s. Average
wave velocities in the superior–inferior, medial–lateral and anterior–posterior anatomical directions were found to be 2,295,
2,469 and 2,754 m/s, respectively; the differences corresponding to the three directions do not appear to be significant.
Subsequently, the modulus was then determined using elastic wave propagation theory. |
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Keywords: | Trabeculae modulus Ultrasonic testing MicroCT imaging Microarhictecture |
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