Estimation and visualization of longitudinal muscle motion using ultrasonography: a feasibility study

Area of Science:

• Biomechanics
• Medical Imaging
• Physiology

Background:

• Ultrasonography is a valuable, radiation-free tool for real-time muscle motion analysis.
• Estimating dense, longitudinal muscle deformation fields, especially at varying depths, remains underexplored.
• Limited research exists on visualizing muscle motion and its clinical applications.

Purpose of the Study:

• To develop and validate a novel framework for estimating, visualizing, and quantitatively analyzing longitudinal muscle motion.
• To provide spatial and temporal details of muscle contraction activities.
• To explore potential clinical applications for assessing skeletal muscle function.

Main Methods:

• A primal-dual algorithm was employed for longitudinal motion estimation of the gastrocnemius muscle (GM).
• A comprehensive framework integrating motion estimation, visualization, and quantitative analysis was proposed.
• Ultrasound image sequences (25 fps) were acquired from healthy subjects performing isometric plantar flexion.

Main Results:

• The proposed visualization methods successfully captured spatial and temporal details of GM motion during isometric plantar flexion.
• Preliminary results indicate the framework aids in studying muscle contraction dynamics.
• A quantitative measure differentiated between normal and dysfunctional lower limbs in a patient with cerebral infarction.

Conclusions:

• The developed framework offers detailed insights into longitudinal muscle motion and synchronous muscle activities.
• The quantitative measures show promise for complementing existing methods like electromyography (EMG) and torque analysis in functional assessments.
• This approach has potential clinical utility in evaluating skeletal muscle function and neurological dysfunction.