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Tissue Elasticity Imaging

Tissue Elasticity Imaging
Volume 1: Theory and Methods

by S. Kaisar Alam,Brian S. Garra

  • Publisher : Elsevier
  • Release : 2019-06-15
  • Pages : 237
  • ISBN : 0128096616
  • Language : En, Es, Fr & De
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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
Volume 2: Clinical Applications

by S. Kaisar Alam,Brian S. Garra

  • Publisher : Elsevier
  • Release : 2019-12-09
  • Pages : 254
  • ISBN : 0128096845
  • Language : En, Es, Fr & De
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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
A Book

by Eric Chung Jay Chen

  • Publisher : Unknown Publisher
  • Release : 1995
  • Pages : 228
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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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.

Spectral Strain Estimation Techniques for Tissue Elasticity Imaging

Spectral Strain Estimation Techniques for Tissue Elasticity Imaging
A Book

by Kenneth Leon Hoyt,Flemming Forsberg

  • Publisher : Unknown Publisher
  • Release : 2005
  • Pages : 366
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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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
A Book

by Susheel Reddy Vadde

  • Publisher : Unknown Publisher
  • Release : 2011
  • Pages : 58
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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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.

Measurement of Soft Tissue Elasticity in Vivo

Measurement of Soft Tissue Elasticity in Vivo
Techniques and Applications

by Yan-Ping Huang,Yong-Ping Zheng

  • Publisher : CRC Press
  • Release : 2015-11-04
  • Pages : 229
  • ISBN : 1466576294
  • Language : En, Es, Fr & De
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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

Elastography

Elastography
Imaging of Biological Tissue Elasticity

by Eduardo Ignacio Céspedes Terrén

  • Publisher : Unknown Publisher
  • Release : 1993
  • Pages : 574
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Tissue Motion and Elasticity Imaging

Tissue Motion and Elasticity Imaging
A Book

by Michael F. Insana,Jeffrey C. Bamber

  • Publisher : Unknown Publisher
  • Release : 2000
  • Pages : 308
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Inverse and Optimum Drive Problems in Ultrasonic Imaging of Soft Tissue Elasticity

Inverse and Optimum Drive Problems in Ultrasonic Imaging of Soft Tissue Elasticity
A Book

by K. R. Raghavan

  • Publisher : Unknown Publisher
  • Release : 1994
  • Pages : 129
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Tissue Elasticity Imaging

Tissue Elasticity Imaging
Volume 1: Theory and Methods

by S. Kaisar Alam,Brian S. Garra

  • Publisher : Elsevier
  • Release : 2019-11-29
  • Pages : 258
  • ISBN : 0128096837
  • Language : En, Es, Fr & De
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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
A Book

by Anonim

  • Publisher : Unknown Publisher
  • Release : 2001
  • Pages : 129
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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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.

Ultrasound Transient Shear Wave Elasticity Imaging for Tendon Tissue

Ultrasound Transient Shear Wave Elasticity Imaging for Tendon Tissue
A Book

by Pengfei Song

  • Publisher : Unknown Publisher
  • Release : 2010
  • Pages : 129
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Inverse Problems In Dynamic Elasticity Imaging

Inverse Problems In Dynamic Elasticity Imaging
A Book

by Christoph Moosbauer

  • Publisher : Anchor Academic Publishing (aap_verlag)
  • Release : 2015-03-25
  • Pages : 118
  • ISBN : 395489906X
  • Language : En, Es, Fr & De
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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.

An Elasticity Microscope for High Resolution Imaging of Tissue Stiffness Using 50 MHz Ultrasound

An Elasticity Microscope for High Resolution Imaging of Tissue Stiffness Using 50 MHz Ultrasound
A Book

by N. Abraham Cohn

  • Publisher : Unknown Publisher
  • Release : 1997
  • Pages : 129
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Prostate Carcinoma Detection Using Combined Ultrasound, Elasticity, and Tissue Strain-Hardening Imaging

Prostate Carcinoma Detection Using Combined Ultrasound, Elasticity, and Tissue Strain-Hardening Imaging
A Book

by Anonim

  • Publisher : Unknown Publisher
  • Release : 2003
  • Pages : 12
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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The underlying hypothesis of this study is that remote, non-invasive measurements of elasticity in prostate glands are possible and can provide unique examiner-independent information that can increase the detection and/or characterization of potentially malignant masses in the prostate not accessible to manual palpation. The purpose of this study is to develop ultrasound technology to produce high-resolution displacement and strain data throughout the prostate for remote evaluation of the strain-dependent elastic (Young's or shear) modulus. To this end, the main objective of this research program is to test the hypothesis that quantitative elasticity images of the prostate can be obtained with real-time ultrasound. To achieve this objective, the authors have developed speckle tracking algorithms and methods for strain and elasticity imaging of the prostate. These studies include adaptive displacement and strain imaging, incompressibility processing, and strain-hardening imaging. Next, they will test the developed methods using tissue-mimicking and tissue-containing phantoms, and well-defined clinical studies. At the conclusion of the study, a prototype of the clinical prostate ultrasound elasticity imager will be designed. The overall program is intended to demonstrate that combined ultrasound, elasticity, and strain-hardening imaging permits surrogate, remote palpation of the prostate gland. (7 figures, 21 refs.).

Acoustical Imaging

Acoustical Imaging
A Book

by Michael Halliwell,Peter N.T. Wells

  • Publisher : Springer Science & Business Media
  • Release : 2001-01-31
  • Pages : 565
  • ISBN : 0306465167
  • Language : En, Es, Fr & De
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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.

An Investigation Of Tissue Elasticity Measurement Using Shear Wave Elastography

An Investigation Of Tissue Elasticity Measurement Using Shear Wave Elastography
A Book

by Huong Eng Ting

  • Publisher : Unknown Publisher
  • Release : 2013
  • Pages : 172
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Quantitative Reconstruction of Tissue Elasticity from Vibrating Ultrasound Image Sequences

Quantitative Reconstruction of Tissue Elasticity from Vibrating Ultrasound Image Sequences
A Book

by Dongshan Fu

  • Publisher : Unknown Publisher
  • Release : 2000
  • Pages : 254
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Mathematical Methods in Elasticity Imaging

Mathematical Methods in Elasticity Imaging
A Book

by Habib Ammari,Elie Bretin,Josselin Garnier,Hyeonbae Kang,Hyundae Lee,Abdul Wahab

  • Publisher : Princeton University Press
  • Release : 2015-04-06
  • Pages : 240
  • ISBN : 0691165319
  • Language : En, Es, Fr & De
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This book is the first to comprehensively explore elasticity imaging and examines recent, important developments in asymptotic imaging, modeling, and analysis of deterministic and stochastic elastic wave propagation phenomena. It derives the best possible functional images for small inclusions and cracks within the context of stability and resolution, and introduces a topological derivative–based imaging framework for detecting elastic inclusions in the time-harmonic regime. For imaging extended elastic inclusions, accurate optimal control methodologies are designed and the effects of uncertainties of the geometric or physical parameters on stability and resolution properties are evaluated. In particular, the book shows how localized damage to a mechanical structure affects its dynamic characteristics, and how measured eigenparameters are linked to elastic inclusion or crack location, orientation, and size. Demonstrating a novel method for identifying, locating, and estimating inclusions and cracks in elastic structures, the book opens possibilities for a mathematical and numerical framework for elasticity imaging of nanoparticles and cellular structures.

Iterative Methods for the Elasticity Imaging Inverse Problem

Iterative Methods for the Elasticity Imaging Inverse Problem
A Book

by Brian C. Winkler

  • Publisher : Unknown Publisher
  • Release : 2014
  • Pages : 192
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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"Cancers of the soft tissue reign among the deadliest diseases throughout the world and effective treatments for such cancers rely no early and accurate detection of tumors within the interior of the body. One such diagnostic tool, known as elasticity imaging or elastography, uses measurements of tissue displacement to reconstruct the variable elasticity between healthy and unhealthy tissue inside the body. This gives rise to a challenging parameter identification inverse problem, that of identifying the Lamé parameter [mu] in a system of partial differential equations in linear elasticity. Due to the near incompressibility of human tissue, however, common techniques for solving the direct and inverse problems are rendered ineffective due to a phenomenon known as the 'locking effect.' Alternative methods, such as mixed finite element methods, must be applied to overcome this complication. Using these methods, this work reposes the problem as a generalized saddle point problem along with a presentation of several optimization formulations, including the modified output least squares (MOLS), energy output least squares (EOLS), and equation error (EE) frameworks, for solving the elasticity imaging inverse problem. Subsequently, numerous iterative optimization methods, including gradient, extragradient, and proximal point methods, are explored and applied to solve the related optimization problem. Implementations of all of the iterative techniques under consideration are applied to all of the developed optimization frameworks using a representative numerical example in elasticity imaging. A thorough analysis and comparison of the methods is subsequently presented."--Abstract.