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IEEE transactions on ultrasonics, ferroelectrics, and frequency control2020; 67(5); 1017-1024; doi: 10.1109/TUFFC.2019.2963162

Evaluation of Structural Anisotropy in a Porous Titanium Medium Mimicking Trabecular Bone Structure Using Mode-Converted Ultrasonic Scattering.

Abstract: The mode-converted (longitudinal to transverse, L-T) ultrasonic scattering method was utilized to characterize the structural anisotropy of a phantom mimicking the structural properties of trabecular bone. The sample was fabricated using metal additive manufacturing from high-resolution computed tomography (CT) images of a sample of trabecular horse bone with strong anisotropy. Two focused transducers were used to perform the L-T ultrasonic measurements. A normal incidence transducer was used to transmit longitudinal ultrasonic waves into the sample, while the scattered transverse signals were received by an oblique incidence transducer. At multiple locations on the sample, four L-T measurements were performed by collecting ultrasonic scattering from four directions. The amplitude of the root mean square (rms) of the collected ultrasonic scattering signals was calculated for each L-T measurement. The ratios of rms amplitudes for L-T measurements in different directions were calculated to characterize the anisotropy of sample. The results show that the amplitude of L-T converted scattering is highly dependent on the direction of microstructural anisotropy. A strong anisotropy of the microstructure was observed, which coincides with simulation results previously published on the same structure as well as with the anisotropy estimated from the CT images. These results suggest the potential of mode-converted ultrasonic scattering methods to assess the anisotropy of materials with porous, complex structures, including trabecular bone.
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Publication Date: 2020-01-10 PubMed ID: 31940527PubMed Central: PMC7301879DOI: 10.1109/TUFFC.2019.2963162Google Scholar: Lookup
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Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

This research applied the mode-converted ultrasonic scattering method to assess structural anisotropy in a 3D-printed titanium medium designed to copy the properties of trabecular bone. The study underscored the method’s potential for investigating anisotropy in materials with complex and porous structures like trabecular bone.

Research Methods and Materials

  • The research used a unique approach, namely the mode-converted (from longitudinal to transverse, or L-T) ultrasonic scattering method, as an innovative way to measure and analyze the structural anisotropy of a phantom, a sample created to imitate the structural properties of trabecular bone.
  • This titanium sample was crafted via metal additive manufacturing, using high-resolution computed tomography (CT) images of horse bone tissue as a reference. A significant aspect is the strong anisotropy, or direction-dependent properties, of the trabecular bone.
  • The team used two focused transducers to execute the L-T ultrasonic measurements. One transducer was used to transmit longitudinal ultrasonic waves into the sample, with a second one to capture the scattered transverse signals.

Data Collection and Analysis

  • Investigation involved taking L-T measurements at multiple positions across the sample. For each location, the team obtained ultrasonic scattering data from four different angles.
  • They calculated the root mean square (rms) of the ultrasonic scattering signal amplitudes for every L-T measurement. Consequently, the researchers computed the ratio of the rms amplitudes of L-T measurements taken in varying directions. This helped in characterizing the anisotropy of the sample.

Study Findings

  • The results were suggestive of the fact that the amplitude of the L-T converted scattering varied considerably depending on the direction of the microstructural anisotropy.
  • They found a distinct anisotropy of the phantom’s microstructure, which aligns with prior simulation results published about the same structure. Also, this anisotropy was consistent with the one anticipated from the CT images used in the creation of the phantom.

Conclusion

  • This research indicated that mode-converted ultrasonic scattering methods could hold significant potential for analyzing materials exhibiting a certain level of anisotropy, particularly those with complex, porous structures, such as the trabecular bone tissue.

Cite This Article

APA
Du H, Yousefian O, Horn T, Muller M. (2020). Evaluation of Structural Anisotropy in a Porous Titanium Medium Mimicking Trabecular Bone Structure Using Mode-Converted Ultrasonic Scattering. IEEE Trans Ultrason Ferroelectr Freq Control, 67(5), 1017-1024. https://doi.org/10.1109/TUFFC.2019.2963162

Publication

IEEE transactions on ultrasonics, ferroelectrics, and frequency control
ISSN: 1525-8955
NlmUniqueID: 9882735
Country: United States
Language: English
Volume: 67
Issue: 5
Pages: 1017-1024

Researcher Affiliations

Du, Hualong
    Yousefian, Omid
      Horn, Timothy
        Muller, Marie

          MeSH Terms

          • Algorithms
          • Animals
          • Anisotropy
          • Cancellous Bone / diagnostic imaging
          • Cancellous Bone / physiology
          • Horses
          • Image Processing, Computer-Assisted / methods
          • Models, Biological
          • Phantoms, Imaging
          • Porosity
          • Titanium / chemistry
          • Ultrasonography / instrumentation
          • Ultrasonography / methods

          Grant Funding

          • R03 EB022743 / NIBIB NIH HHS

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          Citations

          This article has been cited 1 times.
          1. Wear K. Scattering in Cancellous Bone. Adv Exp Med Biol 2022;1364:163-175.
            doi: 10.1007/978-3-030-91979-5_8pubmed: 35508875google scholar: lookup
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