Journal
ULTRASOUND IN MEDICINE AND BIOLOGY
Volume 27, Issue 9, Pages 1211-1218Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/S0301-5629(01)00413-6
Keywords
median nerve; speckle tracking; ultrasound; cross-correlation; carpal tunnel syndrome; biomechanics
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Impaired nerve movement can lead to nerve injury (e.g., carpal tunnel syndrome). A noninvasive method to measure nerve movement in longitudinal section would enable an extensive analysis of nerve entrapment syndromes. A method has been developed using cross-correlation between successive high-frequency ultrasound (US) images to measure longitudinal movement of nerve and muscle. Control phantom experiments demonstrated the accuracy and reliability of this method at velocities of 1-10 mm/s. Increasing the frame interval between the compared frames enabled the accurate calculation of slower velocities. The correlation algorithm successfully measured relative movement when the US transducer was moved 1-3 mm over the surface of the forearm. Median nerve movement was repeatedly measured in the forearm during 30 degrees passive wrist extension in three subjects (range 2.63-4.12 mm) and index finger extension in seven subjects (range 1.59-4.48 mm). Median nerve movement values were consistent with those from cadaver studies.
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