Comparison of Interreader Reproducibility of the Prostate Imaging Reporting and Data System and Likert Scales for Evaluation of Multiparametric Prostate MRI

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Abstract
OBJECTIVE. The objective of our study was to compare interreader reproducibility of the recently proposed “Prostate Imaging Reporting and Data System,” or “PI-RADS,” scale incorporating fixed criteria and a standard Likert scale based on overall impression for prostate cancer localization using multiparametric MRI. MATERIALS AND METHODS. Fifty-five patients who underwent a 3-T prostate MRI examination using a pelvic phased-array coil and incorporating T2-weighted imaging, diffusion-weighted imaging, and dynamic contrast-enhanced imaging were included in the study. Three radiologists (6, 4, and 1 year of experience) independently scored 18 regions (12 in the peripheral zone [PZ] and six in the transition zone [TZ]) using PI-RADS (range, 3–15) and Likert (range, 1–5) scales, which were based on fixed criteria and overall impression, respectively. Interreader reproducibility was evaluated using the concordance correlation coefficient (CCC), which assesses exact agreement between scores (minimal, < 0.2; poor,...

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