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Dana Solav

PhD direct track 2011-2016

Advisor: Prof. Alon Wolf

Co-Advisor: Prof. Miles Rubin

 

Contact Details

Office BRML, Lady Davis Building 473
Tel 077-8875945
Fax
Email danas@technion.ac.il

Accurate quantitative motion analysis plays an essential role in understanding normal function as well as pathological conditions of human biomechanical systems. Optoelectronic stereophotogrammetry (OESP) is currently the state of the art in human motion analysis. This technique involves placing markers on the skin surface of the analyzed body segments and capturing their locations in space as a function of time. When the movement of the skeletal system is of interest, this noninvasive technique suffers from a critical limitation which is caused by the relative movement between the skin markers and the underlying bone. This limitation is often referred to as the soft tissue artifact (STA). STA is the most significant source of error in OESP, and a satisfactory solution for its compensation has not been devised yet, despite numerous efforts.

In my research, a novel method based on the theory of a Cosserat point was developed, to analyze the non-rigid kinematics of marker clusters, with an aim to reduce the STA and estimate more accurately the underlying bone pose. Specifically, a marker cluster on a body segment is divided into sub-clusters of three markers, each characterized by a triangular Cosserat point element (TCPE). The non-rigid kinematics of a TCPE was developed and the differences in the kinematics of the different TCPEs were characterized using scalar parameters of deformation. These parameters are evaluated in terms of their ability to identify subset groups of TCPEs which more accurately estimate the underlying bone pose.

The method was first evaluated using an experimental setup which consists of a rigid pendulum with a deformable implant attached to it, to simulate the soft tissue around a bony segment. Then, the method was further developed and tested using ex-vivo and in-vivo data of the lower limb. The results showed that the errors due to the STA can be reduced using the TCPE method, compared to commonly used least squares methods.

Moreover, the TCPE kinematic method was further developed for the purpose of respiratory motion analysis. In this study, chest wall (CW) kinematics measured using OESP was analyzed to evaluate respiratory function. The different breathing patterns of healthy subjects and neuromuscular patients were analyzed using the TCPE method, and results showed that they can be used to detect local asynchronies which are associated with respiratory inefficiency due to muscle weakness and dysfunction.

 

Links:

-Bone Pose Estimation Research

-Respiratory Motion Research

 

 

 

Journal Publications

  1. Dana Solav, MB Rubin, Alon Wolf, "Soft Tissue Artifact compensation using Triangular Cosserat Point Elements (TCPEs)", International  Journal of Engineering Science, vol. 85, pp. 1-9, 2014
  2. D. Solav, M. Rubin, A. Cereatti, V. Camomilla, A. Wolf, “Bone pose estimation in the presence of Soft Tissue Artifact using Triangular Cosserat Point Elements”, Annals of Biomedical Engineering, vol. 44, pp 1181-1190, 2016.
  3. M. Rubin and D. Solav, “Unphysical properties of the rotation tensor estimated by least squares optimization with specific application to biomechanics”, ‚ÄčInternational Journal of Engineering Science,  advance online publication, 2016.

 

Conference Abstracts (*- Presenter)

  1. Solav D*, Meric H, Rubin MB, Pradon D, Lofaso F, Wolf A, “Chest wall kinematics using triangular Cosserat point elements in healthy and neuromuscular subjects“, Oral presentation, The 14th International Symposium of Computer Methods in Biomechanics and Biomedical Engineering, Tel Aviv, Israel, September 2016.
  2. Solav D*, Rubin MB, Wolf A, “Soft tissue artifact description using triangular Cosserat point elements, for gait and respiratory diagnostics“, Oral presentation, The 5th Conference on Advanced Technologies in Diagnostics, Rehabilitation, and Medical Care, Ruppin Academic Center, Israel, April 2016.
  3. Solav D*, Rubin MB, Cereatti A, Camomilla V, Wolf A, “Soft tissue artifact description using triangular Cosserat point elements”, Oral presentation, The XXV Congress of the International Society of Biomechanics, Glasgow, UK, July 2015.
  4. Solav D*, Rubin MB, Cereatti A, Camomilla V, Wolf A, “Soft tissue artifact description using triangular Cosserat point elements (TCPEs)”, Oral presentation, The 33rd Israeli Conference on Mechanical Engineering (ICME), Tel Aviv, Israel, March 2015.
  5. Solav D*, Rubin MB, Cereatti A, Camomilla V, Wolf A, “Soft tissue artifact compensation using triangular Cosserat point elements (TCPEs)”, Poster presentation, The 13th international symposium on 3D analysis of human movement (3D AHM), Lausanne, Switzerland, July 2014.
  6. Solav D*, Rubin MB, Wolf A, " Soft tissue artifact quantification and minimization using Cosserat point elements”, Oral presentation, The XXIV Congress of the International Society of Biomechanics, Natal, Brazil, August 2013.
  7. Solav D*, Rubin MB, Wolf A, "Estimation of rigid body motion and the soft tissue artifact with Cosserat point theory", Oral presentation, The 32nd Israeli Conference on Mechanical Engineering, Tel Aviv, Israel, October 2012.
  8. Solav D*, Rubin MB, Wolf A, "Estimation of rigid body motion and the soft tissue artifact with Cosserat point theory", Oral presentation, The 18th Congress of the European Society of Biomechanics, Lisbon, Portugal, July 2012.

2011-2016

Solid Mechanics 2