Dynamic diffuse optical tomography imaging of peripheral arterial disease.

Area of Science:

• Biomedical Optics
• Medical Imaging
• Vascular Diagnostics

Background:

• Peripheral arterial disease (PAD) involves arterial narrowing due to plaque, impairing blood flow to extremities and potentially causing cell death.
• Current diagnostic methods struggle with patients exhibiting calcified arteries, a common comorbidity in diabetes.
• Effective PAD diagnosis is crucial for timely intervention and preventing severe complications.

Purpose of the Study:

• To investigate dynamic diffuse optical tomography (DDOT) as a novel, non-invasive imaging modality for assessing peripheral arterial disease (PAD) in lower extremities.
• To evaluate DDOT's efficacy in visualizing vascular perfusion, particularly in challenging cases with calcified arteries.

Main Methods:

• Utilized dynamic diffuse optical tomography (DDOT), a non-ionizing technique employing near-infrared light.
• DDOT generates spatio-temporal maps of oxy- and deoxy-hemoglobin concentrations within tissues.
• Conducted three case studies: a healthy volunteer, a PAD patient, and a diabetic PAD patient with calcified arteries.

Main Results:

• DDOT successfully visualized vascular perfusion in all three study participants.
• Significant differences in DDOT time-traces and generated images were observed between the healthy volunteer, PAD patient, and diabetic PAD patient.
• The results highlight DDOT's capability to differentiate perfusion characteristics across varying vascular conditions.

Conclusions:

• Dynamic diffuse optical tomography (DDOT) demonstrates considerable potential as a new diagnostic tool for peripheral arterial disease (PAD).
• DDOT offers a viable alternative for assessing PAD, especially in patients with arterial calcifications where conventional methods are limited.
• Further research and validation are warranted to establish DDOT in clinical practice for PAD diagnosis.