Related Experiment Video
Updated: Jun 6, 2026
Diffusion Imaging in the Rat Cervical Spinal Cord
Published on: April 7, 2015
Liver diffusion-weighted MR imaging: the tower of Babel?
Abstract:
There is a growing amount of literature regarding diffusion-weighted imaging (DWI) of the liver. The apparent diffusion coefficient (ADC) was introduced in 1986 and is used extensively in studies. However, methods for calculating ADC vary considerably and the value of the ADC strongly depends on the b values chosen for its calculation. Indeed, the ADC incorporates the effects of both diffusion and perfusion, which can vary independently. Since signal attenuation as a function of b follows a bi-exponential pattern, other diffusion/perfusion coefficients can be calculated using DWI, and these may provide more meaningful measurements than the ADC. The absence of standardization for both the terminology and the methodology in DWI of the liver makes it difficult for readers to understand the technique used and strongly limits comparisons between studies. Here, we review the main principles of DWI of the liver, the limits of the ADC, and the exciting capabilities of multi-parametric DWI. We also insisted on the need for a common language for DWI of the liver.
Insights
Diffusion-weighted imaging (DWI) of the liver faces challenges due to inconsistent apparent diffusion coefficient (ADC) calculation methods. Multi-parametric DWI offers more meaningful measurements, but standardization is crucial for reliable liver imaging comparisons.
Area of Science:
- Medical Imaging
- Radiology
- Biophysics
Background:
- Diffusion-weighted imaging (DWI) is increasingly used for liver assessment.
- The apparent diffusion coefficient (ADC) is a common metric, but its calculation is inconsistent.
- ADC values are influenced by both diffusion and perfusion, which can vary independently.
Discussion:
- DWI signal attenuation follows a bi-exponential pattern, enabling calculation of other diffusion/perfusion coefficients.
- These advanced metrics may offer more precise insights than standard ADC.
- Lack of standardized terminology and methodology hinders study comparability in liver DWI.
Key Insights:
- Current ADC calculation methods for liver DWI lack standardization, impacting reliability.
- Multi-parametric DWI provides a more comprehensive approach to liver tissue characterization.
- Standardized protocols and terminology are essential for advancing liver DWI research and clinical application.
Outlook:
- Future research should focus on developing standardized DWI protocols for the liver.
- Establishing a common language will facilitate multi-center studies and clinical translation.
- Multi-parametric DWI holds promise for improved diagnosis and monitoring of liver diseases.
