Assessment of muscle stiffness using a continuously scanning laser-Doppler vibrometer.

ABSTRACT

INTRODUCTION: A stand-alone and low-cost elastography technique has been developed using a single continuously scanning laser Doppler vibrometer. METHODS: This elastography technique is used to measure the propagation velocity of surface vibrations over superficial skeletal muscles to assess muscle stiffness. RESULTS: Systematic variations in propagation velocity depending on the contraction level and joint position of the biceps brachii were demonstrated in 10 subjects. CONCLUSIONS: This technique may assist clinicians in characterizing muscle stiffness (or tone) changes due to neuromuscular disorders.