Multiparametric MRI for Prostate Cancer Detection: New Insights into the Combined Use of a Radiomic Approach with Advanced Acquisition Protocol

Abstract

Prostate cancer (PCa) is a disease affecting an increasing number of men worldwide. Several efforts have been made to identify imaging biomarkers to non-invasively detect and characterize PCa, with substantial improvements thanks to multiparametric Magnetic Resonance Imaging (mpMRI). In recent years, diffusion kurtosis imaging (DKI) was proposed to be directly related to tissue physiological and pathological characteristic, while the radiomic approach was proven to be a key method to study cancer imaging phenotypes. Our aim was to compare a standard radiomic model for PCa detection, built using T2-weighted (T2W) and Apparent Diffusion Coefficient (ADC), with an advanced one, including DKI and quantitative Dynamic Contrast Enhanced (DCE), while also evaluating differences in prediction performance when using 2D or 3D lesion segmentation. The obtained results in terms of diagnostic accuracy were high for all of the performed comparisons, reaching values up to 0.99 for the area under a receiver operating characteristic curve (AUC), and 0.98 for both sensitivity and specificity. In comparison, the radiomic model based on standard features led to prediction performances higher than those of the advanced model, while greater accuracy was achieved by the model extracted from 3D segmentation. These results provide new insights into active topics of discussion, such as choosing the most convenient acquisition protocol and the most appropriate postprocessing pipeline to accurately detect and characterize PCa.

Keywords: PI-RADS; diffusion kurtosis imaging; dynamic contrast-enhanced magnetic resonance imaging; magnetic resonance imaging; prostate cancer; radiomics.

Figure 1

Area under the receiver operating characteristics curve (AUC) (full line), sensitivity (dashed line), and specificity (dotted line) of the multivariable models for adv3D (in blue) and adv2D (in red), for model orders from 1 to 10.

Figure 2

Area under the receiver operating characteristics curve (AUC) (full line), sensitivity (dashed line), and specificity (dotted line) of the multivariable models for adv3D (in blue) and std3D (in yellow), for model orders from 1 to 10.