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Diffusion Imaging in the Rat Cervical Spinal Cord
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Diffusion imaging of the vertebral bone marrow.

Olaf Dietrich1, Tobias Geith2, Maximilian F Reiser1,2

  • 1Josef Lissner Laboratory for Biomedical Imaging, Institute for Clinical Radiology, Ludwig Maximilian University Hospital Munich, Germany.

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|June 27, 2015
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Summary

Diffusion-weighted MRI (DWI) helps differentiate vertebral bone marrow fractures. Osteoporotic fractures show higher apparent diffusion coefficients (ADC) than malignant ones, aiding diagnosis.

Keywords:
diffusion-weighted MRIspinal columnvertebral bodiesvertebral bone marrowvertebral compression fractures

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Area of Science:

  • Radiology
  • Medical Imaging
  • Biophysics

Background:

  • Diffusion-weighted MRI (DWI) is crucial for characterizing vertebral bone marrow pathologies.
  • Differentiating benign (osteoporotic) from malignant vertebral compression fractures is clinically significant.
  • Vertebral bone marrow DWI is challenging due to magnetic susceptibility variations and short T*2 relaxation times, complicating echo-planar imaging (EPI).

Purpose of the Study:

  • To review pulse sequence types vital for vertebral bone marrow DWI.
  • To summarize apparent diffusion coefficient (ADC) values for normal and fractured vertebral bone marrow.
  • To discuss the utility of DWI in differentiating osteoporotic from malignant vertebral compression fractures.

Main Methods:

  • Review of 24 studies measuring diffusion in normal vertebral bone marrow.
  • Analysis of DWI data from studies on vertebral compression fractures.
  • Evaluation of qualitative image contrast from diffusion-weighted acquisitions for lesion differentiation.

Main Results:

  • Normal vertebral bone marrow ADC typically ranges from 0.2 to 0.6 × 10⁻³ mm²/s.
  • Osteoporotic fractures exhibit significantly higher ADCs (1.2–2.0 × 10⁻³ mm²/s) compared to malignant fractures (0.7–1.3 × 10⁻³ mm²/s).
  • Diffusion-weighted steady-state free precession sequences effectively differentiate lesions, showing malignant ones as hyperintense and osteoporotic ones as hypointense/isointense.

Conclusions:

  • DWI is a valuable tool for characterizing vertebral bone marrow and differentiating fracture types.
  • Quantitative ADC values and qualitative image contrast provide complementary information for diagnosis.
  • Advanced DWI techniques offer improved differentiation of benign and malignant vertebral compression fractures.