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Assessment of Mechanically Induced Changes in Helical Fiber Microstructure Using Diffusion Tensor Imaging.

Roberto Alonso Pineda Guzman1, Noel Naughton2, Shreyan Majumdar2

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Keywords:
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Area of Science:

  • Biomedical Engineering
  • Medical Imaging
  • Tissue Mechanics

Background:

  • Noninvasive methods for assessing collagen-based fibrous tissue microstructure in vivo are limited.
  • Diffusion Tensor Imaging (DTI) is a quantitative imaging technique, primarily used in neuroimaging, with potential for musculoskeletal applications.
  • Understanding DTI's relationship with fiber microstructure in heterogeneous tissues like ligaments and tendons remains challenging.

Purpose of the Study:

  • To evaluate Diffusion Tensor Imaging's (DTI) capability in detecting microstructural alterations induced by mechanical loading.
  • To investigate DTI's sensitivity to differentiate between static and fatigue loading effects on tissue microstructure.
  • To assess DTI's potential as a noninvasive tool for evaluating collagen-based fibrous tissues.

Main Methods:

  • Utilized tissue-mimicking helical fiber constructs with known microstructures.
  • Applied static and fatigue mechanical loading to the constructs.
  • Employed high-resolution optical imaging, micro-computed tomography, and Diffusion Tensor Imaging (DTI) for analysis.

Main Results:

  • Both static and fatigue loading reduced sample diameter and realigned macro-scale fiber twist.
  • DTI revealed distinct microstructural changes: static load increased diffusion anisotropy and decreased radial diffusivity (fiber compaction).
  • Fatigue loading increased diffusivity and altered principal diffusion direction, indicating fiber compaction and architectural disruption.

Conclusions:

  • Diffusion Tensor Imaging (DTI) can detect mechanically induced microstructural changes in collagenous tissues that are not apparent at the bulk level.
  • DTI shows promise as a noninvasive technique for assessing microstructure in helically arranged collagenous tissues like ligaments and tendons.
  • DTI can differentiate between the microstructural effects of static versus fatigue loading in fibrous tissues.