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Imaging three-dimensional innervation zone distribution in muscles from M-wave recordings
Chuan Zhang1, Yun Peng1, Yang Liu1
1Department of Biomedical Engineering, University of Houston, Houston, TX 77204, United States of America.
Journal of Neural Engineering
|March 31, 2017
Summary
A new 3D imaging technique noninvasively maps neuromuscular junctions in skeletal muscles. This advancement aids in diagnosing and managing neuromuscular disorders like amyotrophic lateral sclerosis.
Area of Science:
- Biomedical Engineering
- Neuroscience
- Musculoskeletal Imaging
Background:
- Accurate localization of neuromuscular junctions (NMJs) is crucial for understanding neuromuscular disorders.
- Current methods for NMJ visualization in vivo are limited.
Purpose of the Study:
- To develop and validate a novel three-dimensional (3D) global innervation zone imaging technique.
- To characterize the distribution and features of NMJs in skeletal muscles in vivo.
Main Methods:
- Utilized electrically evoked high-density surface electromyogram (sEMG) recordings.
- Developed a 3D global innervation zone imaging technique to reconstruct NMJ distribution.
- Evaluated the technique in the biceps brachii of six human subjects.
Main Results:
- Successfully mapped innervation zones in 3D muscle space with mean depth of 1.5 ± 0.3 cm.
- Results align with previous histological findings.
- Innervation zone volumes and distributions varied with stimulation intensity, stabilizing at supramaximal response.
Conclusions:
- The developed technique offers high performance for noninvasive in vivo imaging of NMJ distributions.
- Demonstrated feasibility for clinical applications, including botulinum toxin injection guidance and early diagnosis of neurodegenerative diseases like ALS.