Evaluation of liver hemangiomas using three different b values on diffusion MR

Area of Science:

• Radiology
• Medical Imaging
• Hepatology

Background:

• Liver hemangiomas are common benign liver tumors.
• Accurate non-invasive characterization is crucial for diagnosis and management.
• Diffusion-weighted magnetic resonance imaging (DW-MRI) shows promise in differentiating liver lesions.

Purpose of the Study:

• To evaluate the effectiveness of different b-values (100, 600, 1000 s/mm(2)) in diffusion-weighted MRI for depicting liver hemangiomas.
• To assess the influence of lesion size on apparent diffusion coefficient (ADC) values in hemangiomas.

Main Methods:

• Diffusion-weighted MRI was performed on 61 hemangiomas in 32 patients before contrast administration.
• Apparent diffusion coefficients (ADCs) were measured for lesions and compared to normal liver parenchyma across b-values of 100, 600, and 1000 s/mm(2).
• Hemangiomas were categorized by size (<3 cm and ≥3 cm), and data were analyzed using ANOVA and HSD Tukey tests.

Main Results:

• No significant correlation was found between lesion size and ADC values across different b-values.
• Lower ADC values were observed with higher b-values in both normal liver tissue and hemangiomas.
• Higher b-values, especially b-1000 s/mm(2), demonstrated a more significant difference between hemangioma and normal liver ADC values (p=0.000).

Conclusions:

• Higher b-values in DW-MRI, particularly b-1000 s/mm(2), enhance the differentiation between liver hemangiomas and normal liver parenchyma.
• Apparent diffusion coefficient (ADC) measurements are not significantly affected by lesion size.
• DW-MRI with higher b-values is a valuable tool for characterizing liver hemangiomas.