Diffusion weighted imaging in musculoskeletal system: where are we now?

Area of Science:

• Musculoskeletal Imaging
• Radiology
• Biomedical Engineering

Background:

• Diffusion-weighted imaging (DWI) utilizes water molecule diffusion for musculoskeletal disorder assessment.
• DWI differentiates isotropic and anisotropic diffusion, providing insights into tissue integrity and pathology.
• Key metrics include apparent diffusion coefficient (ADC) and fractional anisotropy (FA) for quantifying microstructural changes.

Purpose of the Study:

• To review the diverse applications of DWI and diffusion tensor imaging (DTI) in musculoskeletal imaging.
• To highlight the potential of DWI and DTI in improving diagnostic precision and clinical outcomes.
• To address the ongoing challenges and limitations associated with DWI in musculoskeletal imaging.

Main Methods:

• Review of advanced MRI techniques, focusing on DWI, DTI, and diffusion kurtosis imaging (DKI).
• Analysis of DWI's role in characterizing tissue microstructure, integrity, and pathology.
• Exploration of DWI's application in diagnosing and monitoring musculoskeletal conditions, including tumors, infections, and joint pathologies.

Main Results:

• DWI provides critical insights into tissue integrity and pathology by differentiating diffusion types.
• Advanced DWI techniques like DTI and DKI enhance evaluation of complex tissue architectures (muscle, ligament, tendon, cartilage).
• DWI is effective in assessing soft tissue tumors, infections (e.g., osteomyelitis), and joint pathologies, differentiating benign from malignant lesions.

Conclusions:

• DWI and DTI are instrumental in musculoskeletal imaging, offering enhanced diagnostic precision for various conditions.
• ADC changes observed with DWI can monitor treatment responses, correlating with tumor necrosis and recurrence.
• Despite limitations like artifacts and interpretation challenges, DWI holds significant potential to improve clinical outcomes in musculoskeletal diagnostics.