Three-dimensional elastography for cervical lymph node volume measurements: a study to investigate feasibility,...

Area of Science:

• Medical Imaging
• Diagnostic Ultrasound
• Biomedical Engineering

Background:

• Accurate measurement of cervical lymph node volume is crucial for diagnosis and treatment monitoring.
• Ill-defined lymph node boundaries pose challenges for traditional ultrasound imaging.
• Three-dimensional (3-D) elastography offers potential for improved tissue characterization.

Purpose of the Study:

• To assess the feasibility of 3-D elastography for cervical lymph node volume measurement.
• To compare the accuracy and reliability of 3-D elastography versus 3-D grayscale ultrasound for ill-defined nodes.
• To evaluate inter-observer reproducibility and intra-observer repeatability of both techniques.

Main Methods:

• Utilized 3-D elastography and 3-D grayscale ultrasound on porcine lymph nodes in phantoms.
• Compared ultrasound measurements against a water-displacement method for accuracy assessment.
• Evaluated inter-observer and intra-observer variability in measurements.
• Included four patients with enlarged neck nodes for clinical validation.

Main Results:

• 3-D elastography clearly delineated ill-defined lymph nodes, which appeared indistinct on grayscale ultrasound.
• 3-D elastography demonstrated significantly higher measurement accuracy (84.2%) compared to 3-D grayscale ultrasound (62.2%).
• 3-D elastography exhibited superior reproducibility (ICC=0.909) and repeatability (ICC=0.964-0.988) than 3-D grayscale ultrasound (ICC=0.777 and 0.863-0.906).

Conclusions:

• 3-D elastography is a feasible, accurate, and reliable method for measuring the volume of ill-defined cervical lymph nodes.
• The technique shows significant potential for improving the assessment of lymph node volume in clinical practice.
• 3-D elastography surpasses conventional 3-D grayscale ultrasound in accuracy and reliability for challenging lymph node measurements.