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Characterizing the Diffusion Properties of Prostate Tissue Using Paired MR Microscopy and Multidimensional Diffusion

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Diffusion MRI reveals distinct properties in prostate tissues. Benign and early-stage prostate cancer epithelium show similar diffusion, while advanced cancer exhibits increased restricted water diffusion.

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Area of Science:

  • Biomedical Imaging
  • Diffusion MRI Physics
  • Prostate Cancer Research

Background:

  • Understanding diffusion properties of prostate tissues is crucial for cancer detection and characterization.
  • Multidimensional diffusion MRI (dMRI) offers high-resolution insights into tissue microstructure.

Purpose of the Study:

  • To characterize and compare diffusion properties of prostate epithelium and stroma in benign and cancerous tissues using advanced dMRI techniques.
  • To evaluate the efficacy of different diffusion models in describing these tissue types.

Main Methods:

  • Paired MR microscopy and multidimensional dMRI were performed on fixed prostate tissue samples at ultra-high field (16.4 T).
  • Image segmentation identified epithelial, stromal, and luminal components.
  • A linear signal model estimated aggregate epithelial and stromal signal contributions, followed by fitting four diffusion models.
  • Model quality was assessed using the Akaike Information Criterion (AICc), with voxel-wise fitting for cancer comparison.

Main Results:

  • The Ball+Sphere diffusion model provided the best fit for both epithelial and stromal tissues, outperforming the ADC model.
  • Epithelium exhibited a higher sphere fraction and lower ball-compartment diffusivity compared to stroma.
  • Gleason 3+3 cancer showed diffusion parameters similar to benign tissues, whereas Gleason 4+4 cancer displayed a significantly increased sphere fraction in epithelial components.

Conclusions:

  • The Ball+Sphere model accurately describes direction-averaged diffusion in fixed prostate epithelium and stroma.
  • Diffusion properties of epithelium in Gleason 3+3 prostate cancer are comparable to benign tissue.
  • Gleason 4+4 prostate cancer demonstrates a notable increase in restricted water volume fraction within the epithelium.