An Approach Toward Assessing Head-and-Neck Lymphedema Using Tissue Dielectric Constant Ratios: Method and Normal...

Area of Science:

• Biomedical Engineering
• Medical Diagnostics

Background:

• Quantitative assessment of limb lymphedema is established, but methods for head-and-neck lymphedema are limited.
• Current quantification relies on time-consuming and potentially inaccurate manual measurements of the head, face, and neck.

Purpose of the Study:

• To develop a convenient and accurate method for quantifying head-and-neck lymphedema.
• To establish subject-independent indices for tracking lymphedema progression and treatment response.

Main Methods:

• Utilized tissue dielectric constant (TDC) measurements, which reflect tissue water content.
• Normalized TDC values from neck and submental areas to forearm TDC values to create Neck-to-Arm Index (NAI) and Submental-to-Arm Index (SAI).
• Measured TDC in 60 healthy adults at neck, submental, and arm sites.

Main Results:

• Mean NAI was 1.253 ± 0.222 and mean SAI was 1.214 ± 0.296.
• Established head-and-neck lymphedema thresholds at NAI of 1.80 and SAI of 1.95 (mean + 2.5 SD).
• Demonstrated that these normalized indices can reflect changes associated with lymphedema.

Conclusions:

• The NAI and SAI indices provide a novel, convenient, and accurate approach for quantifying head-and-neck lymphedema.
• These indices can be used to detect and monitor changes in lymphedema status, aiding in treatment assessment.
• This method offers a significant improvement over existing, less precise measurement techniques.