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24 July 2001 Measurement of material properties of hard and soft biological tissues by means of V(z) and V(f) curves obtained with acoustic microscopy
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Abstract
Measurement of acoustic propagation speed (C) and attenuation (a) in biological tissues serves to enhance our understanding of how tissue composition and structure affects organ function. We applied the V(z)-technique to measurement of C in embedded cancellous bone at 1 GHz using an acoustic microscope and succeeded in recording the Cs of both longitudinal lateral waves (CL) and Rayleigh waves (CR). The former ranged between 2.33 and 4.33 km/s (mean ±SD: 3.37 ±0.61 km/s) and the latter between 1.93 and 2.07 km/s (2.00 ± 0.06 km/s), which is in the range expected on the basis of known properties of bone and acoustic field theory. With respect to soft tissue sections, the V(z)-technique is practically impossible to use, and therefore we applied the V(f)-technique to sections of chordae tendineae. Initial measurements of C and a of aortic tissue, which is well characterized, showed a C of 1.59 ± 0.04km/s and α of 0.230 ±0.001 dB/μm at signal frequencies 0.95 to 1.02 GHz. These results were in agreement with those of others and the chordae subsequently revealed a mean C of 1.79 ±0.18 km/s and α of 0.220 ±0.010 dB/micrometers . The distribution of the properties across the chordal sections showed a regularly undulating pattern which followed the undulating pattern of the collagen fiber arrangement. We conclude that the V(z)- and V(f)-technique are both valuable techniques for microelastic characterization of biological tissues.
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Claus Schiott Jorgensen, J. Michael Hasenkam, and Tribikram Kundu "Measurement of material properties of hard and soft biological tissues by means of V(z) and V(f) curves obtained with acoustic microscopy", Proc. SPIE 4335, Advanced Nondestructive Evaluation for Structural and Biological Health Monitoring, (24 July 2001); https://doi.org/10.1117/12.434179
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