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Journal of Computer Assisted Tomography:
doi: 10.1097/RCT.10.1097/RCT.0b013e3182951fe9
Abdominal Imaging

Focal Liver Lesion Classification and Characterization in Noncirrhotic Liver: A Prospective Comparison of Diffusion-Weighted Magnetic Resonance–Related Parameters

Colagrande, Stefano MD*; Regini, Francesco MD*; Pasquinelli, Filippo MD*; Mazzoni, Lorenzo Nicola MS; Mungai, Francesco MD*; Filippone, Antonella MD; Grazioli, Luigi MD§

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Abstract

Purpose

The objective of this study was to prospectively verify if diffusion-weighted magnetic resonance (DwMR)–related parameters such as perfusion fraction (f) and slow diffusion coefficient (D), according to Le Bihan theory, are more effective than apparent diffusion coefficient (ADC) for classification and characterization of the more frequent focal liver lesions (FLLs) in noncirrhotic liver.

Methods

Sixty-seven patients underwent standard liver magnetic resonance imaging (MRI) and free-breath multi-b DwMR study. Two regions of interest were defined by 2 observers, including 1 FLL for each patient (21 hemangiomas, 21 focal nodular hyperplasias, 25 metastases) and part of surrounding parenchyma, respectively. For every FLL, D, f, and ADC were estimated both as absolute value and as ratio between FLL and surrounding parenchyma by fitting the reduced equation of the bicompartmental model to experimental data; t test, analysis of variance, and receiver operating characteristic analysis were performed.

Results

t Test showed significant differences in ADClesion, flesion, Dlesion, ADCratio, and Dratio values between benign and malignant FLLs, more pronounced for ADClesion (P < 0.0009) and ADCratio (P = 0.001). Applying cutoff values of 1.55 × 10 − 3 mm2/s (ADClesion) and 0.89 (ADCratio), the DwMR study presented sensitivities and specificities, respectively, of 84% and 80% (for ADClesion), 72% and 80% (ADCratio).

Conclusions

Apparent diffusion coefficient (by fitting procedures) better performs than do D and f in FLL classification, especially when its values are less than 1.30 or greater than 2.00 × 10 − 3 mm2/s.

Copyright © 2013 by Lippincott Williams & Wilkins

  

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