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Prostate Cancer Diffusion-Weighted Magnetic Resonance Imaging: Does the Choice of Diffusion-Weighting Level Matter?
Stephan E Maier1,2, Jonas Wallström1,3, Fredrik Langkilde1,3
1Department of Radiology, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
Journal of Magnetic Resonance Imaging : JMRI
|September 18, 2021
Summary
Optimizing b-values in prostate diffusion-weighted MRI improves apparent diffusion coefficient (ADC) reproducibility. This study demonstrates how b-value selection impacts quantitative measures for better prostate cancer assessment.
Area of Science:
- Magnetic Resonance Imaging
- Radiology
- Oncology
Background:
- Diffusion-weighted MRI (DW-MRI) is crucial for multiparametric prostate lesion assessment.
- Apparent diffusion coefficient (ADC) is a potential biomarker for prostate cancer, but its clinical utility is limited by poor reproducibility.
- Standardizing DW-MRI protocols is essential for reliable ADC measurements.
Purpose of the Study:
- To evaluate the influence of different diffusion-weighting levels (b-values) on contrast-to-noise ratio and quantitative ADC measurements in prostate DW-MRI.
- To determine optimal b-value combinations for reproducible prostate cancer assessment.
- To provide recommendations for prostate DW-MRI protocol and analysis.
Main Methods:
- Retrospective analysis of clinical data from 21 men with PI-RADS v2 score ≥3.
- Simulations based on published data to assess b-value impact across a wide range.
- Quantitative analysis of ADC and lesion-to-normal tissue ADC ratios using various b-value combinations.
- Statistical comparison using paired two-tailed Student's t-tests.
Main Results:
- Clinical data and simulations showed consistent findings regarding b-value dependence.
- Optimal b-value selection aligned with PI-RADSv2 recommendations when using two b-values.
- Increasing maximum b-value from 1000 to 1500 s/mm² caused a 15% ADC decrease but no significant change in lesion-to-normal tissue ADC ratio with two b-values.
- Multi-point b-value acquisitions (≥3 points) resulted in smaller ADC declines (8%) and ADC ratio changes (2.6%-3.8%).
Conclusions:
- B-value selection significantly impacts ADC measurements and reproducibility in prostate DW-MRI.
- Comprehensive assessment of b-value dependence is key for developing standardized protocols.
- Recommendations for protocol and analysis can enhance the reliability of prostate cancer diffusion-weighted MRI.
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