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Tissue Elasticity Imaging

Tissue Elasticity Imaging Book
Author : S. Kaisar Alam,Brian S. Garra
Publisher : Elsevier
Release : 2019-06-15
ISBN : 0128096616
Language : En, Es, Fr & De

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Book Description :

Tissue Elasticity Imaging: Volume One, Theory and Methods offers an extensive treatment of the fundamentals and applications of this groundbreaking diagnostic modality. The book introduces elasticity imaging, its history, the fundamental physics, and the different elasticity imaging methods, along with their implementation details, problems and artefacts. It is an essential resource for all researchers and practitioners interested in any elasticity imaging modality. As many diseases, including cancers, alter tissue mechanical properties, it is not always possible for conventional methods to detect changes, but with elasticity images that are produced by slow tissue deformation or low-frequency vibration, these changes can be displayed. Offers the first comprehensive reference on elasticity imaging Discusses the fundamentals of technology and their limitations and solutions, along with advanced methods and future directions Addresses the technologies and applications useful to both researchers and clinical practitioners Includes an online reference section regularly updated with advances in technology and applications

Tissue Elasticity Imaging

Tissue Elasticity Imaging Book
Author : S. Kaisar Alam,Brian S. Garra
Publisher : Elsevier
Release : 2019-12-09
ISBN : 0128096845
Language : En, Es, Fr & De

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Book Description :

Tissue Elasticity Imaging: Volume Two: Clinical Applications offers an extensive treatment of the fundamentals and applications of this groundbreaking diagnostic modality. Techniques and results are presented for the assessment of breast, prostate, heart, liver and thyroid tissues. For each application, details are provided on how to perform each technique, along with methods of interpretation, diagnostic criteria, quality assurance, challenges and case studies. This book is an essential resource for all researchers and practitioners (including scientists, radiologists, urologists, fellows and residents) interested in any elasticity imaging modality. As many diseases, including cancers, alter tissue mechanical properties, it is not always possible for conventional methods to detect changes, but with elasticity images that are produced by slow tissue deformation or low-frequency vibration, these changes can be displayed. Offers the first comprehensive reference on elasticity imaging Discusses the fundamentals of technology and their limitations and solutions, along with advanced methods and future directions Addresses the technologies and applications useful to both researchers and clinical practitioners Includes an online reference section regularly updated with advances in technology and applications

Ultrasound Tissue Displacement and Tissue Elasticity Imaging

Ultrasound Tissue Displacement and Tissue Elasticity Imaging Book
Author : Eric Chung Jay Chen
Publisher : Unknown
Release : 1995
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

In this dissertation, we investigate the feasibility of using high frequency ultrasound, to measure tissue motion and tissue elasticity for medical imaging applications. Ultrasound provides a means for non-invasive imaging of soft tissues, providing soft tissue contrast that cannot be achieved using conventional X-ray or tomographic imaging. A two-dimensional correlation search algorithm is used to track local tissue displacements from radio frequency (RF) ultrasound echoes and from digitized ultrasound images. The accuracy of displacement imaging is investigated as a function of various imaging parameters such as ultrasound frequency and target size. Ultrasound elasticity imaging consists of three basic steps: (1) measurement of tissue displacement, (2) estimation of tissue stresses and strains, and (3) recovery of tissue elasticity. Tissue strains and tissue elasticities are obtained from reconstructed tissue displacement fields and experimental measurements of applied stresses. Ultrasound elasticity measurements were compared with independent Instron load cell elasticity measurements. Several examples of tissue displacement imaging of breast tumors in human breast cancer patients and ultrasound elasticity measurements of tissue phantoms (soft gels), and samples of bovine muscle and fat tissue are provided.

Measurement of Soft Tissue Elasticity in Vivo

Measurement of Soft Tissue Elasticity in Vivo Book
Author : Yan-Ping Huang,Yong-Ping Zheng
Publisher : CRC Press
Release : 2015-11-04
ISBN : 1466576294
Language : En, Es, Fr & De

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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 lea

Spectral Strain Estimation Techniques for Tissue Elasticity Imaging

Spectral Strain Estimation Techniques for Tissue Elasticity Imaging Book
Author : Kenneth Leon Hoyt,Flemming Forsberg
Publisher : Unknown
Release : 2005
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Spectral Strain Estimation Techniques for Tissue Elasticity Imaging book written by Kenneth Leon Hoyt,Flemming Forsberg, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Improving Tissue Elasticity Imaging Using a Kalman Filter based Non rigid Motion Tracking Algorithm

Improving Tissue Elasticity Imaging Using a Kalman Filter based Non rigid Motion Tracking Algorithm Book
Author : Susheel Reddy Vadde
Publisher : Unknown
Release : 2011
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Imaging biomechanical properties of biological tissues under deformation has strong implications to many medical applications such as cancer detection and surgery planning. Quantifying the elasticity of soft tissue using an optical sensor is particularly attractive because it is non-invasive and easy to operate. However, the current computing method is plagued by the existence of noises in the two-frame optical flow solutions. In this thesis, a Kalman filter based tracking algorithm is examined, aiming to improve the quality of cumulative motion over a long video sequence. The proposed method is robust and is capable of handling non-rigid motion that is typical of soft tissue. Experiments of using videos of four rat tissue specimen subject to a biomechanical tensile test indicates that the proposed tracking method is very promising in generating a smooth, accurate, and continuous multiframe motion field. This type of multi-frame motion data not only allows us to compute a more accurate individual strain elastogram, but also provide valuable information for calibrating a series of relative strain images over the entire deformation process.

Tissue Motion and Elasticity Imaging

Tissue Motion and Elasticity Imaging Book
Author : Michael F. Insana,Jeffrey C. Bamber
Publisher : Unknown
Release : 2000
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Tissue Motion and Elasticity Imaging book written by Michael F. Insana,Jeffrey C. Bamber, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Elastography

Elastography Book
Author : Eduardo Ignacio Céspedes Terrén
Publisher : Unknown
Release : 1993
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Elastography book written by Eduardo Ignacio Céspedes Terrén, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Ultrasound Transient Shear Wave Elasticity Imaging for Tendon Tissue

Ultrasound Transient Shear Wave Elasticity Imaging for Tendon Tissue Book
Author : Pengfei Song
Publisher : Unknown
Release : 2010
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Ultrasound Transient Shear Wave Elasticity Imaging for Tendon Tissue book written by Pengfei Song, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Tissue Elasticity Imaging

Tissue Elasticity Imaging Book
Author : S. Kaisar Alam,Brian S. Garra
Publisher : Elsevier
Release : 2019-11-29
ISBN : 0128096837
Language : En, Es, Fr & De

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Book Description :

Tissue Elasticity Imaging: Volume One: Theory and Methods offers an extensive treatment of the fundamentals and applications of this groundbreaking diagnostic modality. The book introduces elasticity imaging, its history, the fundamental physics, and the different elasticity imaging methods, along with their implementation details, problems and artefacts. It is an essential resource for all researchers and practitioners interested in any elasticity imaging modality. As many diseases, including cancers, alter tissue mechanical properties, it is not always possible for conventional methods to detect changes, but with elasticity images that are produced by slow tissue deformation or low-frequency vibration, these changes can be displayed. Offers the first comprehensive reference on elasticity imaging Discusses the fundamentals of technology and their limitations and solutions, along with advanced methods and future directions Addresses the technologies and applications useful to both researchers and clinical practitioners Includes an online reference section regularly updated with advances in technology and applications

A Wave Equation Approach to Ultrasound Elastography

A Wave Equation Approach to Ultrasound Elastography Book
Author : Anonim
Publisher : Unknown
Release : 2001
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Tissue elastography is a field of medical imaging which deals with obtaining images of tissue mechanical properties, in particular tissue elasticity. Every elastography imaging system has three major components: an exciter, an imaging system, and an image processing software module. The principle of operation of these systems is that softer and harder tissues react differently to a mechanical excitation. The imaging system captures images of the tissue as the mechanical exciter deforms the tissue. The image processing software module then computes the tissue motion from the acquired images, and solves an inverse problem to obtain tissue elasticity from tissue displacements. In ultrasound elastography all three components of the displacement are not available, and the measurement is carried out only on the imaging plane. The problem of inversion using partial measurements is an inherently challenging problem. To solve this problem the phase speed is estimated in the first place. This thesis studies the process of estimating tissue elasticity from tissue displacements, using the phase speed estimation. It is shown that, in general, the elasticity cannot be inferred from the phase speed, but under certain boundary and excitation conditions, a relationship exists between the phase speed and the elasticity. However the relationship depends on the boundary and excitation conditions. Based on the developed results, a novel rheometry method is proposed for visco-elastic characterization of tissue samples. To increase the resolution of the elasticity images it is of interest to use higher frequencies of excitation. However the inherent low frame rate of ultrasound systems posed a limitation. A novel high-frame-rate ultrasound system is introduced which is capable of tracking motions of up to 500Hz. The high-frame-rate system is used in conjunction with the inversion algorithms to form an elastography system. The performance of the system is tested experimentally on tissue mi.

Inverse Problems In Dynamic Elasticity Imaging

Inverse Problems In Dynamic Elasticity Imaging Book
Author : Christoph Moosbauer
Publisher : Anchor Academic Publishing (aap_verlag)
Release : 2015-03-25
ISBN : 395489906X
Language : En, Es, Fr & De

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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.

Acoustical Imaging

Acoustical Imaging Book
Author : Michael Halliwell,Peter N.T. Wells
Publisher : Springer Science & Business Media
Release : 2001-01-31
ISBN : 0306465167
Language : En, Es, Fr & De

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Book Description :

The International Symposium of Acoustical Imaging has been widely recognized as the premier forum for presentations of advanced research result in both theoretical and experimental development. Held regularly since 1968, the symposium brings together international leading researchers in the area of acoustical imaging. The proceedings from the 25th meeting contains articles on the following topics: Mathematics and Physics of Acoustical Imaging, Transducers and Arrays, Nondestructive Evaluation, Geophysical and Underwater Ultrasonics, Microscopy and Microscanning, Scattering by Blood and Tissue, Medical and Biological Image Formation, Tissue Characterization, Tissue and Motion and Blood Flow, Elasticity Imaging, Hard Tissues, and Novel and Emerging Methods.

Nonlinear Elasticity Imaging Using the Adjoint Method

Nonlinear Elasticity Imaging Using the Adjoint Method Book
Author : Nachiket Hemant Gokhale
Publisher : Unknown
Release : 2007
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Abstract: It is well known that the mechanical properties of soft tissue can change with tissue pathology. For example, it is observed that the elastic (shear) modulus of malignant breast masses is typically an order of magnitude higher than the back ground of normal glandular tissue. In addition it is also known that with increasing applied strain the stiffness of cancerous soft tissues increases more rapidly than the background of non-malignant soft tissues. Medical imaging techniques such as ultrasound imaging, combined with novel displacement estimation techniques enable the calculation of the displacement field in the interior of soft tissue. While many attempts have been made to use this information to map the linear elastic properties of soft tissue, relatively few attempts have been made that account for both large deformation and material non-linearity in reconstructing the elastic properties. In this dissertation, new algorithms are developed, implemented, and tested to reconstruct the material parameters in non-linear, large deformation hyperelastic tissue models. The overall computational problem is formulated as a constrained minimization problem where the difference between a measured and a predicted displacement field is minimized. Upon discretization, the constraint takes the form of a finite element (FEN) model for the hyperelastic tissue response. In the forward FEM model, due consideration is given to issues of mesh locking which are avoided by the use of enhanced strain and higher order finite elements. The optimization problem is solved efficiently using a quasi-Newton method and adjoint gradient calculation, which significantly reduces the computational costs compared to more traditional approaches. A novel technique based on continuation in the material properties is used to further accelerate the inverse problem solution.

Quantitative Three Dimensional Elasticity Imaging

Quantitative Three Dimensional Elasticity Imaging Book
Author : Michael Scott Richards
Publisher : Unknown
Release : 2007
ISBN : 9781109851724
Language : En, Es, Fr & De

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Book Description :

The aim of this work is to develop and evaluate techniques to image and quantify the mechanical properties of soft tissues in three dimensions (3 D). To that end, this thesis presents and validates a method by which three dimensional ultrasound images can be used to image and quantify the shear modulus distribution of tissue mimicking phantoms. This work is presented to motivate and justify the use of this elasticity imaging technique in a clinical breast cancer screening study. The imaging methodologies discussed are intended to improve the specificity of mammography practices in general. During the development of these techniques, several issues concerning the accuracy and uniqueness of the result were elucidated.

An Investigation Of Tissue Elasticity Measurement Using Shear Wave Elastography

An Investigation Of Tissue Elasticity Measurement Using Shear Wave Elastography Book
Author : Huong Eng Ting
Publisher : Unknown
Release : 2013
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download An Investigation Of Tissue Elasticity Measurement Using Shear Wave Elastography book written by Huong Eng Ting, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Elastography

Elastography Book
Author : Richard G. Barr
Publisher : Thieme
Release : 2016-12-14
ISBN : 1626232725
Language : En, Es, Fr & De

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Book Description :

This practical guide is a compilation of firsthand expertise from leading authorities around the world on the use of ultrasound elastography. The stiffness or softness of the imaged tissue derived from elastography provides accurate radiologic diagnosis for disease processes including cancer, inflammation, and fibrosis. It is an efficacious and accurate diagnostic imaging modality that helps avoid invasive biopsies. The first two chapters cover basic fundamental principles of elastography, with subsequent chapters exploring pathology-specific utilization. The authors cover the extensively validated and implemented use of elastography for diffuse liver disease, and diseases of the breast andthyroid gland. They also discuss the potential benefits and limitations for the prostate, spleen, pancreas, kidneys, musculoskeletal system, salivary glands, lymph nodes, and testes. The book concludes with a chapter on potential future applications of this ever-evolving technology. Key Highlights Discussion of key differences between strain elastography and shear wave elastography by individual organ systems Clinical pearls on how to accurately perform elastography and tips for avoiding false-positive or false-negative results Case studies elucidate the targeted use of elastographic findings by specific pathology Illustrations in the breast and liver chapters demonstrate precise transducer techniques MRI elastography as an emerging and safe assessment tool, primarily for the diagnosis of liver disease, with emergent potential for additional organs This book provides key knowledge on visualizing quantifiable differences in tissue elasticity and applying this data to improved treatment strategies for diverse pathologies. It is essential reading for radiologists, sonographers, and imaging technicians.