Diabetic Foot Ulcer Imaging: An Overview and Future Directions

Area of Science:

• Medical Imaging
• Diabetology
• Wound Care

Background:

• Diabetic foot ulcers (DFUs) are a common complication, affecting one in three people with diabetes.
• Clinical assessment of DFUs is subjective; objective imaging is crucial for effective treatment.
• Conventional imaging aids in diagnosing infections, bone involvement, deformities, and vascular issues in DFUs.

Purpose of the Study:

• To summarize various imaging techniques used for assessing diabetic foot ulcers.
• To highlight the role of optical imaging in evaluating tissue oxygenation and perfusion.
• To introduce a novel spatio-temporal near-infrared (NIR) imaging approach for DFU assessment.

Main Methods:

• Review of conventional imaging modalities (CT, MRI, PET, SPECT, ultrasound).
• Discussion of optical imaging techniques: hyperspectral, multispectral, diffuse reflectance spectroscopy, NIR spectroscopy, laser Doppler, spatial frequency domain imaging.
• Introduction of a spatio-temporal NIR-based imaging approach for oxygenation flow mapping.

Main Results:

• Conventional imaging effectively diagnoses structural and vascular complications.
• Optical imaging modalities provide insights into tissue oxygenation and perfusion.
• The novel NIR approach maps spatio-temporal oxygenation asynchrony in DFUs.

Conclusions:

• Imaging significantly enhances the objective assessment of DFUs.
• Advanced optical and NIR techniques offer detailed physiological insights.
• Future DFU imaging should focus on low-cost, portable, multi-modal platforms for comprehensive wound management.