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Hybrid multidimensional T(2) and diffusion-weighted MRI for prostate cancer detection
Shiyang Wang1, Yahui Peng, Milica Medved
1Department of Radiology, the University of Chicago, Chicago, Illinois, USA.
Journal of Magnetic Resonance Imaging : JMRI
|August 3, 2013
Summary
Hybrid multidimensional MRI reveals that apparent diffusion coefficient (ADC) and T2 values change with echo time (TE) and b-value in normal prostate tissue but not in prostate cancer. This imaging technique may enhance prostate cancer diagnosis.
Area of Science:
- Magnetic Resonance Imaging (MRI)
- Prostate Cancer Diagnostics
- Diffusion-Weighted Imaging (DWI)
Background:
- Apparent diffusion coefficient (ADC) and T2 relaxation time are key MRI parameters for tissue characterization.
- Understanding the dependence of ADC on echo time (TE) and T2 on b-value is crucial for accurate interpretation in prostate imaging.
- Hybrid multidimensional imaging offers a novel approach to probe these dependencies.
Purpose of the Study:
- To investigate the relationship between ADC and TE, and T2 and b-value in normal prostate tissue and prostate cancer.
- To evaluate the utility of hybrid multidimensional imaging in differentiating prostate cancer from normal tissue.
- To assess how variations in ADC and T2 with imaging parameters affect cancer conspicuity.
Main Methods:
- Utilized 3 Tesla prostate MRI with hybrid multidimensional imaging sequences.
- Acquired diffusion-weighted MRI (DWI) data at multiple b-values (0, 750, 1500 s/mm²) and echo times (47, 75, 100 ms).
- Measured ADC and T2 in normal and cancerous prostate regions of interest (ROIs) and analyzed their dependence on TE and b-value, respectively, using the Friedman test.
Main Results:
- In normal prostate tissue, ADC significantly varied with TE, and T2 significantly varied with b-value.
- In prostate cancer ROIs, average ADC and T2 values showed no significant change with TE and b-value, respectively.
- However, individual cancer pixels exhibited significant ADC decreases with increasing TE and T2 increases with increasing b-value, enhancing cancer conspicuity at longer TEs.
Conclusions:
- The dependence of ADC on TE and T2 on b-value differs between normal prostate and prostate cancer.
- Hybrid imaging parameters, reflecting coupled ADC and T2 values, hold potential for improving prostate cancer detection accuracy.
- This advanced MRI technique may offer new insights into prostate cancer characterization.
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