Prostate cancer detection with multi-parametric MRI: Logistic regression analysis of quantitative T2, diffusion-weighted imaging, and dynamic contrast-enhanced MRI

✍ Scribed by Deanna L. Langer; Theodorus H. van der Kwast; Andrew J. Evans; John Trachtenberg; Brian C. Wilson; Masoom A. Haider

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 541 KB
• Volume: 30
• Category: Article
• ISSN: 1053-1807
• DOI: 10.1002/jmri.21824

✦ Synopsis

Abstract

Purpose

To develop a multi‐parametric model suitable for prospectively identifying prostate cancer in peripheral zone (PZ) using magnetic resonance imaging (MRI).

Materials and Methods

Twenty‐five radical prostatectomy patients (median age, 63 years; range, 44–72 years) had T2‐weighted, diffusion‐weighted imaging (DWI), T2‐mapping, and dynamic contrast‐enhanced (DCE) MRI at 1.5 Tesla (T) with endorectal coil to yield parameters apparent diffusion coefficient (ADC), T2, volume transfer constant (K^trans^) and extravascular extracellular volume fraction (v~e~). Whole‐mount histology was generated from surgical specimens and PZ tumors delineated. Thirty‐eight tumor outlines, one per tumor, and pathologically normal PZ regions were transferred to MR images. Receiver operating characteristic (ROC) curves were generated using all identified normal and tumor voxels. Step‐wise logistic‐regression modeling was performed, testing changes in deviance for significance. Areas under the ROC curves (A~z~) were used to evaluate and compare performance.

Results

The best‐performing single‐parameter was ADC (mean A~z~ [95% confidence interval]: A~z,ADC~: 0.689 [0.675, 0.702]; A~z,T2~: 0.673 [0.659, 0.687]; A~z,Ktrans~: 0.592 [0.578, 0.606]; A~z,ve~: 0.543 [0.528, 0.557]). The optimal multi‐parametric model, LR‐3p, consisted of combining ADC, T2 and K^trans^. Mean A~z,LR‐3p~ was 0.706 [0.692, 0.719], which was significantly higher than A~z,T2~, A~z,Ktrans~, and A~z,ve~ (P < 0.002). A~z,LR‐3p~ tended to be greater than A~z,ADC~, however, this result was not statistically significant (P = 0.090).

Conclusion

Using logistic regression, an objective model capable of mapping PZ tumor with reasonable performance can be constructed. J. Magn. Reson. Imaging 2009;30:327–334. © 2009 Wiley‐Liss, Inc.