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Diffusion tensor imaging of the physis: the ABC's.

Laura A Santos1, Brendan Sullivan2, Ola Kvist3,4

  • 1Department of Radiology, Columbia University Irvine Medical Center, New York, NY, USA. ls3865@cumc.columbia.edu.

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Diffusion tensor imaging (DTI) visualizes the growth plate (physis) and its microstructural changes. This technique aids in assessing normal bone growth and identifying physeal dysfunction in children and adolescents.

Keywords:
AnisotropyChildDiffusion tensor imagingGrowth plateMagnetic resonance imagingPhysisTractography

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Area of Science:

  • Biomedical Imaging
  • Orthopedic Research
  • Pediatric Radiology

Background:

  • The physis (growth plate) is crucial for longitudinal bone growth.
  • Diffusion Tensor Imaging (DTI) reveals water molecule diffusion, offering insights into tissue microstructure.
  • Tractography, a DTI application, visualizes cellular architecture and indirectly reflects physeal activity.

Purpose of the Study:

  • To demonstrate the clinical utility of DTI tractography for evaluating the physeal-metaphyseal complex.
  • To illustrate age- and location-dependent variations in DTI metrics during normal growth.
  • To present DTI findings in pediatric patients with physeal dysfunction.

Main Methods:

  • Utilized DTI tractography to image the physeal-metaphyseal complex in children and adolescents.
  • Acquired and interpreted DTI data, including qualitative and quantitative metrics.
  • Developed a comprehensive "DTI pipeline" from image acquisition to data interpretation.

Main Results:

  • DTI tractography successfully depicted the columnar structure of cartilage and new bone in the physeal-metaphyseal complex.
  • Variations in DTI metrics were observed with age and skeletal location during normal growth.
  • DTI tractography identified abnormalities in patients with growth hormone deficiency, trauma, chemotherapy, and radiation-induced physeal injury.

Conclusions:

  • DTI tractography is a valuable clinical tool for assessing pediatric bone growth and physeal health.
  • The technique aids in diagnosing and understanding various causes of physeal dysfunction.
  • Standardized DTI pipelines enhance the reliability of interpreting physeal microstructural changes.