Diffusion-Weighted Imaging in Hepatic Lesion Evaluation
Summary
Diffusion-Weighted Imaging (DWI) has emerged as a pivotal non-invasive tool for characterising focal liver lesions by probing the Brownian motion of water molecules at the cellular and microvascular level. By acquiring images under varying diffusion weightings (b-values), DWI generates quantitative maps—most commonly the apparent diffusion coefficient (ADC)—that reflect tissue cellularity, integrity of cell membranes and microcirculatory perfusion. In hepatic oncology, reductions in ADC frequently correlate with increased tumour cellularity and fibrosis, whereas higher values may indicate necrosis or benign cystic change. Beyond the monoexponential model, advanced diffusion techniques such as intravoxel incoherent motion (IVIM) separate true molecular diffusion from pseudo-diffusion related to microvascular flow, and diffusion kurtosis imaging (DKI) characterises deviations from Gaussian diffusion in heterogeneous tumour microenvironments. These approaches enhance lesion classification, guide biopsy decisions and refine treatment monitoring, particularly in hepatocellular carcinoma (HCC) and metastases. Clinically, DWI complements contrast-enhanced MRI protocols, offering functional insights without exogenous agents, and supports prognostic modelling by correlating diffusion metrics with histological grade, angiogenesis and early therapeutic response.
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Diffusion-Weighted Imaging in Hepatic Lesion Evaluation publication trend
The graph below shows the total number of articles in diffusion-weighted imaging in hepatic lesion evaluation across all publications each year (not limited to Nature Index journals).
Technical terms
Diffusion-Weighted Imaging (DWI): A magnetic resonance technique that sensitises images to the random motion of water molecules within tissues, revealing microstructural and microvascular properties.
Apparent Diffusion Coefficient (ADC): A quantitative index derived from DWI reflecting the magnitude of water diffusion within tissue, influenced by cellular density and extracellular space.
Intravoxel Incoherent Motion (IVIM): An advanced DWI model that separates pure molecular diffusion from microvascular (pseudo-diffusion) effects to provide diffusion and perfusion parameters without contrast agents.
Perfusion Fraction (fp): An IVIM-derived parameter representing the proportion of the MR signal attributed to microvascular blood flow within the voxel.
Virtual MR Elastography (vMRE): A diffusion-based computational method estimating tissue stiffness by translating high-b-value diffusion metrics into shear modulus values.
References
- Multi-b-value DWI to evaluate the synergistic antiproliferation and anti-heterogeneity effects of bufalin plus sorafenib in an orthotopic HCC model. European Radiology Experimental (2024).
- Diffusion–based virtual MR elastography for predicting recurrence of solitary hepatocellular carcinoma after hepatectomy. Cancer Imaging (2024).
- Intravoxel incoherent motion (IVIM) in diffusion-weighted imaging (DWI) for Hepatocellular carcinoma: correlation with histologic grade. Oncotarget (2016).
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