Intravoxel incoherent motion model-based liver lesion characterisation from three b-value diffusion-weighted MRI
A-H Penner1, A M Sprinkart, G M Kukuk
1Department of Radiology, University of Bonn, Bonn, Germany.
European Radiology
|May 14, 2013
Summary
Intravoxel incoherent motion (IVIM) analysis using three b-value diffusion-weighted MRI improves liver lesion characterization compared to conventional methods. This approach offers stable, voxel-wise results with efficient acquisition times.
Area of Science:
- Radiology
- Medical Imaging
- Oncology
Background:
- Liver lesion characterization is crucial for diagnosis and treatment planning.
- Diffusion-weighted imaging (DWI) is a valuable tool for assessing tissue microstructure.
- Intravoxel incoherent motion (IVIM) modeling provides advanced insights beyond conventional DWI parameters.
Purpose of the Study:
- To evaluate the efficacy of a three b-value IVIM model for liver lesion characterization.
- To compare the diagnostic performance of IVIM parameters with conventional apparent diffusion coefficient (ADC) values.
- To assess the feasibility of voxel-wise IVIM analysis in clinical settings.
Main Methods:
- Retrospective analysis of 1.5-T DWI data from 38 patients with liver lesions.
- Acquisition using a respiratory-gated spin-echo echo-planar sequence with b-values of 0, 50, and 800 s/mm(2).
- Calculation of conventional ADC and IVIM parameters (D', ADC_low, f') using voxel-wise analysis; statistical comparison via t-tests and ROC analysis.
Main Results:
- IVIM-based parameters showed more significant differences between liver lesions and healthy tissue than conventional ADC.
- Receiver operating characteristic (ROC) analysis indicated superior discriminability for IVIM parameters.
- ADC_low and f' best differentiated hepatocellular carcinomas (HCCs) from focal nodular hyperplasias (FNHs), while D' distinguished hemangiomas (HEMs) from FNHs and HCCs.
Conclusions:
- Three b-value DWI enables a numerically stable, voxel-wise IVIM analysis for enhanced liver lesion characterization.
- IVIM analysis offers superior performance compared to conventional ADC determination.
- The presented IVIM method is effective, stable, and suitable for clinical application with acceptable acquisition times.
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