Abstract
The feasibility of shutter-speed model dynamic-contrast-enhanced MRI pharmacokinetic analyses for prostate cancer detection was investigated in a prebiopsy patient cohort. Differences of results from the fast-exchange-regime- allowed (FXR-a) shutter-speed model version and the fast-exchange-limit- constrained (FXL-c) standard model are demonstrated. Although the spatial information is more limited, postdynamic-contrast-enhanced MRI biopsy specimens were also examined. The MRI results were correlated with the biopsy pathology findings. Of all the model parameters, region-of-interest-averaged K trans difference [ΔKtrans ≡ K trans(FXR-a) - Ktrans(FXL-c)] or two-dimensional K trans(FXR-a) vs. kep(FXR-a) values were found to provide the most useful biomarkers for malignant/benign prostate tissue discrimination (at 100% sensitivity for a population of 13, the specificity is 88%) and disease burden determination. (The best specificity for the fast-exchange-limit- constrained analysis is 63%, with the two-dimensional plot.) Ktrans and kep are each measures of passive transcapillary contrast reagent transfer rate constants. Parameter value increases with shutter-speed model (relative to standard model) analysis are larger in malignant foci than in normal-appearing glandular tissue. Pathology analyses verify the shutter-speed model (FXR-a) promise for prostate cancer detection. Parametric mapping may further improve pharmacokinetic biomarker performance. Magn Reson Med, 2013. © 2012 Wiley Periodicals, Inc.
Original language | English (US) |
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Pages (from-to) | 171-178 |
Number of pages | 8 |
Journal | Magnetic Resonance in Medicine |
Volume | 69 |
Issue number | 1 |
DOIs | |
State | Published - Jan 2013 |
Keywords
- DCE-MRI
- prostate
- shutter-speed
ASJC Scopus subject areas
- Radiology Nuclear Medicine and imaging