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Pennation angle dependency in skeletal muscle tissue doppler strain in dynamic contractions
KTH, School of Technology and Health (STH), Medical Engineering.
KTH, School of Technology and Health (STH), Medical Engineering.
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2011 (English)In: Ultrasound in Medicine and Biology, ISSN 0301-5629, Vol. 37, no 7, 1151-1160 p.Article in journal (Refereed) Published
Abstract [en]

Tissue velocity imaging (TVI) is a Doppler based ultrasound technique that can be used to study regional deformation in skeletal muscle tissue. The aim of this study was to develop a biomechanical model to describe the TVI strain's dependency on the pennation angle. We demonstrate its impact as the subsequent strain measurement error using dynamic elbow contractions from the medial and the lateral part of biceps brachii at two different loadings; 5% and 25% of maximum voluntary contraction (MVC). The estimated pennation angles were on average about 4 degrees in extended position and increased to a maximal of 13 degrees in flexed elbow position. The corresponding relative angular error spread from around 7% up to around 40%. To accurately apply TVI on skeletal muscles, the error due to angle changes should be compensated for. As a suggestion, this could be done according to the presented model.

Place, publisher, year, edition, pages
2011. Vol. 37, no 7, 1151-1160 p.
Keyword [en]
Ultrasound, Tissue Doppler, Skeletal muscle, Pennation angle, Strain, Biceps brachii
National Category
Medical Laboratory and Measurements Technologies
URN: urn:nbn:se:kth:diva-35598DOI: 10.1016/j.ultrasmedbio.2011.04.006ISI: 000291716100014ScopusID: 2-s2.0-79959208321OAI: diva2:429835
Swedish Research Council, 2007-3959

QC 20110706

Available from: 2011-07-06 Created: 2011-07-04 Last updated: 2013-05-16Bibliographically approved
In thesis
1. Ultrasonic Quantification of Skeletal Muscle Dynamics: Feasibility and Limitations
Open this publication in new window or tab >>Ultrasonic Quantification of Skeletal Muscle Dynamics: Feasibility and Limitations
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Pain and disorders of the human skeletal muscles are one of the most common reasons for medical consultations in the western countries today and there is a great need to improve both the understanding and treatment of several different muscular conditions.

Techniques describing the muscle function in vivo are often limited by either their invasiveness or lack of spatial resolution. Electromyography (EMG) is the most common approach to assess the skeletal muscle function in vivo, providing information on the neurological input. However, the spatial resolution is in general limited and there are difficulties reaching deep musculature without using invasive needles. Moreover, it does not provide any information about muscle structure or mechanical aspects.

Quantitative ultrasound techniques have gained interest in the area of skeletal muscles and enables non-invasive and in-vivo insight to the intramuscular activity, through the mechanical response of the activation. However, these techniques are developed and evaluated for cardiovascular applications and there are important considerations to be made when applying these methods in the musculoskeletal field. 

This thesis is based on the work from four papers with the main focus to investigate and describe some of these considerations in combination with the development of processing and analyzing methods that can be used to describe the physiological characteristics of active muscle tissue.

In the first paper the accuracy of the Doppler based technique Tissue Velocity Imaging (TVI) was evaluated in a phantom study for very low tissue velocities and the effect of the pulse repetition frequency was considered. The second paper presents a biomechanical model to describe the TVI strain’s dependency on the muscle fiber pennation angle. In the third and fourth papers the intramuscular activity pattern was assessed through the regional tissue deformation by motion mode (M-mode) strain imaging. The activity patterns were analyzed during force regulation and for the effects of fatigue.

The work of this thesis show promising results for the application of these methods on skeletal muscles and indicate high clinical potential where quantitative ultrasound may be a valuable tool to reach a more multifaceted and comprehensive insight in the musculoskeletal function. However, the methodological considerations are highly important for the optimized application and further evaluation and development of analyzing strategies are needed.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. x, 54 p.
Trita-STH : report, ISSN 1653-3836 ; 2013:4
ultrasound, skeletal muscle, intramuscular, dynamics, Tissue Doppler Imaging, Speckle Tracking, strain, quantification
National Category
Medical Image Processing
urn:nbn:se:kth:diva-122233 (URN)978-91-7501-737-2 (ISBN)
Public defence
2013-06-05, sal 3-221, Alfred Nobels Allé 10, Huddinge, 13:00 (Swedish)

QC 20130516

Available from: 2013-05-16 Created: 2013-05-14 Last updated: 2013-05-16Bibliographically approved

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