Elucidation of Isotropic and Anisotropic Shear Elasticity of in Vivo Soft Tissue Using Planar Magnetic Resonance Elastography PDF Download

Author: Sebastian Papazoglou
Publisher:
ISBN:
Category :
Languages : en
Pages : 99

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Author: Yan-Ping Huang
Publisher:
ISBN: 9780367377205
Category :
Languages : en
Pages : 0

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Book Description
The product of 20 years of research, this book covers topics in soft tissue elasticity in vivo, from measurement techniques to clinical applications. It provides, for the first time, a single source that systematically introduces the various techniques for in vivo measurement of soft tissue elasticity in an effort to ease the difficulty between learning technical details and clinical applications of techniques. It also proposes two critical directions for the future of the field that would establish standardized and comparable protocols in clinical research and practice.

Author: Daniel R. Smith
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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Book Description
Human soft tissues are highly complex networks comprised of a variety of components that contribute to the overall functionality of the tissue, but these structures can be disrupted through injury or pathology, leading to tissue dysfunction. Magnetic resonance elastography (MRE) is a developing imaging technique that has shown promise in evaluating human soft tissues in-vivo by providing mechanical property estimates that are sensitive to structural changes in these tissues, including sensitivity to pathological changes. While MRE has proved to be an effective technique in much of human soft tissue, fibrous soft tissues, such as brain white matter and skeletal muscle, cause standard assumptions of mechanical isotropy to fail, resulting in data-model mismatches and inaccurate evaluations of tissue integrity and health. In this thesis, we propose to develop and test an MRE method to evaluate the health of fibrous soft tissues by evaluating structural and functional changes from pathology or injury.

Author: Christoph Moosbauer
Publisher: Anchor Academic Publishing (aap_verlag)
ISBN: 395489906X
Category : Technology & Engineering
Languages : en
Pages : 118

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Book Description
Since the early 1990’s, elasticity imaging techniques are developed as a powerful supplement of the medical toolbox in diagnostic analysis and computer aided surgery. By solving a so-called inverse problem, information about the spatial variation of material parameters of soft (human) tissue are derived from displacement data, which can be measured noninvasively using standard imaging devices such as ultrasound or magnetic resonance tomography. The terms of quasi-static and dynamic elastography refer to the type of load situation, by which the tissue in question is excited. The extension of the theoretical formulation and implementation of the underlying inverse problem in quasi-static elastography to time-harmonic approaches poses several additional challenges, which are addressed in detail within the course of this study. We propose a robust strategy for the reconstruction, which takes advantage of the high sensitivity of the accuracy in harmonic elastography to the choice of the starting point. While not being reported in the literature up to now, the quite competing claims of quasi-static and time-harmonic elastography motivate a comprehensive comparison of these two techniques. Via a spectral decomposition of the curvature information of the underlying inverse problem, a clear explanation for an improved robustness of time- harmonic elastography in the presence of inaccuracies due to noise and/or numerical approximations can be given. Several numerical examples confirm these findings as well as the efficiency of the proposed reconstruction strategy. In particular, it is shown that for moderately low frequencies, it is sufficient to use very coarse finite element meshes, so that the only additional computational cost stems from the worse conditioning of the system matrix.

Author: Ivana Dusan Pajic-Lijakovic
Publisher: Frontiers Media SA
ISBN: 2889716953
Category : Science
Languages : en
Pages : 161

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Book Description

Author: Stéphane Avril
Publisher: Springer
ISBN: 9783319832029
Category : Technology & Engineering
Languages : en
Pages : 144

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Book Description
The articles in this book review hybrid experimental-computational methods applied to soft tissues which have been developed by worldwide specialists in the field. People developing computational models of soft tissues and organs will find solutions for calibrating the material parameters of their models; people performing tests on soft tissues will learn what to extract from the data and how to use these data for their models and people worried about the complexity of the biomechanical behavior of soft tissues will find relevant approaches to address this complexity.

Author: Felix Schrank
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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Author: Julian J. Wu
Publisher: SIAM
ISBN: 9780898712896
Category : Science
Languages : en
Pages : 394

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Book Description
A selection of 26 original papers, some of them substantially revised after the workshop, discuss anisotropic elasticity and its applications in solid mechanics and applied mathematics. Considering elastostatics, elastodynamics, and constitutive relations, they discuss such topics as Green's functio

Author: Ali Zorgani
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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Book Description
The aim of this thesis was the development of a new approach called passive elastography. This approach is inspired from noise correlation methods well developed in seismology and time reversal technics in acoustics. Passive elastography uses shear waves naturally induced in the human body to extract its mechanical properties of soft tissue. The feasibility of this method was tested in several applications. First in ultrasound, slow frame rate ultrasound scanner was used to monitor high intensity focused ultrasound treatment on porcine pancreas. Then, an ultrafast ultrasound scanner was used to retrieve shear wave speed map in a calibrated phantom and in-vivo. Second, Magnetic resonance elastography was implemented to image natural motion in the brain of healthy volunteers and conduct shear wavelength tomography. Third, of ophthalmological and dermatological applications, optical coherence passive elastography was tested in a phantom and a cornea of healthy mouse. Also, a fully optical setup was established to image surface wave for elastography applications. Finally, the resolution limit of elastography was measured using and ultrasound ultrafast scanner.

Author: Larry A Taber
Publisher: World Scientific
ISBN: 9814483397
Category : Science
Languages : en
Pages : 417

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Book Description
Soft biological tissues often undergo large (nearly) elastic deformations that can be analyzed using the nonlinear theory of elasticity. Because of the varied approaches to nonlinear elasticity in the literature, some aspects of the subject may be difficult to appreciate. This book attempts to clarify and unify those treatments, illustrating the advantages and disadvantages of each through various examples in the mechanics of soft tissues. Applications include muscle, arteries, the heart, and embryonic tissues.