16 T diffusion microimaging of fixed prostate tissue: preliminary findings

Area of Science:

• Biomedical Imaging
• Prostate Cancer Research
• Diffusion Tensor Microimaging

Background:

• Understanding water diffusion in prostate tissue is crucial for diagnosing and characterizing diseases.
• Current imaging techniques may lack the resolution to discern cellular-level diffusion differences.
• Formalin-fixed tissues offer a stable platform for high-resolution microimaging studies.

Purpose of the Study:

• To investigate water diffusion properties in formalin-fixed prostate tissue using diffusion tensor microimaging (DTMI).
• To achieve spatial resolution approaching the cellular scale for detailed microstructural analysis.
• To correlate diffusion characteristics with specific tissue compartments and pathological conditions.

Main Methods:

• Diffusion tensor microimaging (DTMI) performed at 16.4 T.
• Acquisition of data with 40 μm isotropic voxels.
• Comparison of DTMI findings with light microscopy of the same tissue samples.

Main Results:

• DTMI successfully demonstrated distinct microscopic diffusion environments and tissue architecture.
• The secretory epithelial cell layer exhibited the most restricted diffusion (D = 0.4 ± 0.1 × 10(-3) mm(2)/sec).
• Fibromuscular stroma showed less restricted diffusion (D = 0.7 ± 0.1 × 10(-3) mm(2)/sec).
• Prostate tumor tissue (Gleason pattern 4+4) lacked distinct glandular structures in diffusion-weighted images, with low diffusivity (D = 0.5 ± 0.1 × 10(-3) mm(2)/sec).

Conclusions:

• DTMI provides cellular-scale insights into prostate tissue microstructure.
• Distinct diffusion compartments (stromal and epithelial) are identified.
• These findings suggest that compartmental diffusion differences likely explain biexponential diffusion decay observed in vivo.