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Diffusion Tensor Imaging of Short T2 Tissues Using Quantitative Ultrashort Echo Time Double-Echo Steady-State: A

Jinil Park1, Sam Sedaghat2, Eddie Fu1

  • 1Department of Radiology, University of California, Davis, Sacramento, California, USA.

NMR in Biomedicine
|November 30, 2025
PubMed
Summary

Quantitative ultrashort echo time double-echo steady-state (qUTE-DESS) MRI successfully visualizes short T2 musculoskeletal tissues. This novel diffusion tensor imaging (DTI) method offers high-resolution parameter maps for improved joint abnormality assessment.

Keywords:
diffusion tensor imagingdouble‐echo steady‐statemusculoskeletalshort T2ultrashort echo time

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Area of Science:

  • Biomedical Imaging
  • Musculoskeletal MRI
  • Diffusion Tensor Imaging

Background:

  • Conventional diffusion tensor imaging (DTI) struggles with short T2 tissues due to signal loss from long echo times.
  • Accurate microstructural assessment of musculoskeletal tissues requires imaging techniques sensitive to both long and short T2 components.
  • Quantitative ultrashort echo time double-echo steady-state (qUTE-DESS) MRI is a novel sequence designed to address these limitations.

Purpose of the Study:

  • To evaluate the feasibility and performance of quantitative ultrashort echo time double-echo steady-state (qUTE-DESS) MRI for imaging short T2 musculoskeletal tissues.
  • To validate the qUTE-DESS sequence in phantoms, an ex vivo porcine hoof, and an in vivo human knee.
  • To assess the capability of qUTE-DESS to generate quantitative parameter maps (T1, T2, diffusivity, mean diffusivity (MD), fractional anisotropy (FA)) in diverse musculoskeletal tissues.

Main Methods:

  • Implementation of the qUTE-DESS sequence on a clinical 3T MRI system.
  • Acquisition of data with six diffusion-weighting orientations to enable calculation of MD and FA.
  • Validation using sucrose, agarose, and celery phantoms, followed by ex vivo porcine hoof and in vivo human knee imaging.

Main Results:

  • Phantoms showed linear relationships between T1, T2, diffusivity, and concentration (R2 > 0.88), and anisotropic diffusion in fibrous structures.
  • qUTE-DESS generated high-resolution MD and FA maps in porcine hoof and human knee tissues (cartilage, meniscus, tendon, ligament, muscle).
  • The technique effectively captured short T2 components missed by conventional DTI, overcoming spin-echo limitations.

Conclusions:

  • qUTE-DESS MRI is a feasible and valuable tool for quantitative microstructural assessment of musculoskeletal tissues, including those with short T2 relaxation times.
  • This approach overcomes limitations of conventional DTI, offering potential for improved detection and evaluation of joint abnormalities and degenerative changes.
  • Further studies are warranted to assess the diagnostic utility of qUTE-DESS in larger patient cohorts with musculoskeletal pathologies.