Hepatic metastases: use of diffusion-weighted echo-planar imaging

Area of Science:

• Radiology
• Medical Imaging
• Oncology

Background:

• Diffusion-weighted MR imaging is a growing tool for identifying and classifying liver lesions.
• Focal hepatic lesions require accurate detection and characterization for effective patient management.

Purpose of the Study:

• To provide an update on diffusion-weighted echo-planar imaging (DW-EPI) of the liver.
• To outline concepts for interpreting DW-EPI scans for hepatic lesions.
• To evaluate the efficacy of DW-EPI in detecting hepatic metastases.

Main Methods:

• Review of existing literature and personal experience with DW-EPI.
• Comparison of DW-EPI with T2-weighted and contrast-enhanced MRI techniques.
• Analysis of technical aspects and image interpretation strategies for liver DW-EPI.

Main Results:

• DW-EPI demonstrates higher sensitivity than T2-weighted MRI for detecting hepatic metastases.
• DW-EPI exhibits accuracy comparable to superparamagnetic iron oxide-enhanced and gadolinium-enhanced MRI.
• Challenges in characterizing small lesions with DW-EPI were noted.

Conclusions:

• DW-EPI offers significant advantages for detecting hepatic metastases.
• Improvements in preoperative evaluation for liver metastases are anticipated with DW-EPI.
• Further characterization of small lesions requires continued research and technique refinement.