Comparison of quantitative T2 mapping and diffusion-weighted imaging in the normal and pathologic prostate

Area of Science:

• Magnetic Resonance Imaging (MRI)
• Biomedical Engineering
• Radiology

Background:

• Accurate characterization of prostate tissue is crucial for diagnosis and treatment.
• Diffusion-weighted imaging (DWI) and T2 relaxation mapping offer valuable insights into tissue microstructure.
• Understanding water diffusion properties can differentiate normal and pathological prostate regions.

Purpose of the Study:

• To obtain diffusion-weighted images of the human prostate for apparent diffusion coefficient (ADC) quantification.
• To accurately calculate T2 values using a dual acquisition fast spin-echo sequence.
• To investigate the relationship between ADC, T2 relaxation rates, and diffusional anisotropy in the prostate.

Main Methods:

• Utilized diffusion-weighted imaging (DWI) for prostate scans.
• Employed a dual acquisition fast spin-echo sequence for T2 calculation.
• Quantified apparent diffusion coefficients (ADCs) in normal and pathological prostate tissues.

Main Results:

• Significantly higher T2 values were observed in the peripheral zone compared to the central gland (P = 0.015).
• No significant correlations were found between ADC values and T2 relaxation rates.
• Evidence of diffusional anisotropy was found in normal prostatic tissue, with significant differences in ADC components (P < 0.040 for peripheral zone, P < 0.001 for central gland).

Conclusions:

• Diffusion-weighted imaging is effective for quantifying prostate ADC values.
• T2 values differ between prostate zones, suggesting distinct tissue properties.
• Diffusional anisotropy exists in normal prostate tissue, indicating directional dependence of water diffusion.