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Author : Laura Mignanelli
Publisher :
ISBN 13 : 9783869488172
Total Pages : pages
Book Rating : 4.4/5 (881 download)
Download or read book Laser Doppler Vibrometry for Cardiovascular Monitoring and Photoacoustic Imaging written by Laura Mignanelli and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Kristian Kroschel
Publisher : Springer Nature
ISBN 13 : 3030466914
Total Pages : 187 pages
Book Rating : 4.0/5 (34 download)
Download or read book Laser Doppler Vibrometry for Non-Contact Diagnostics written by Kristian Kroschel and published by Springer Nature. This book was released on 2020-06-09 with total page 187 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents recent outcomes of the collaborative “Tricorder” project, which brings together partners from industry, research institutes and hospitals to deliver an easy contactless alternative for electrocardiograms (ECG). Featuring contributions investigating the possible applications of laser Doppler vibrometry (LDV) signals for the remote measurement of vital parameters of the heart, the book provides insights into the vision and the history of the "Tricorder" project and the basic differences between the vibrocardiograms and electrocardiograms. It also discusses topics such as signal processing, heartbeat measurement techniques, respiration frequency and oxygen saturation determination, with a particular focus on the diagnostic value of the method presented, e.g., diagnosis of atrial fibrillation and estimation of the oxygen saturation in premature infants. Further, the authors review the advantages and drawbacks of the new method and the specific fields of application. This book will appeal to researchers and industry leaders interested in laser remote sensing for medical applications as well as medical professionals curious about new healthcare technologies.
Author : Enrico Primo Tomasini
Publisher : Springer Nature
ISBN 13 : 3662613182
Total Pages : 173 pages
Book Rating : 4.6/5 (626 download)
Download or read book Laser Doppler Vibrometry written by Enrico Primo Tomasini and published by Springer Nature. This book was released on 2020-06-29 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a continuous learning tool for experienced technical staff facing laser vibrometry technology for the first time. The book covers both theoretical aspects and practical applications of laser Doppler vibrometry, and is accompanied by a multimedia presentation that allows the audience to browse the content and come as close as possible to performing real experiments. After a brief introduction, Chapter 2 presents supporting theory, providing general information on light sources, light scattering and interference for a better understanding of the rest of the book. Chapter 3 examines the theory of laser vibrometers, explaining interferometers from an optical perspective and in terms of the related electronics. It also addresses options like tracking filters and different signal demodulation strategies, since these have a significant impact on the practical use of vibrometers. Chapter 4 explores the configurations that are encountered in today’s instrumentation, with a focus on providing practical suggestions on the use of laser vibrometers. Lastly, Chapter 5 investigates metrology for vibration and shock measurements using laser interferometry, and analyses the uncertainty of laser vibrometers in depth.
Author : Roy Gerardus Maria Kolkman
Publisher :
ISBN 13 : 9789036518062
Total Pages : 134 pages
Book Rating : 4.5/5 (18 download)
Download or read book Photoacoustic & Pulsed Laser-doppler Monitoring of Blood Concentration and Perfusion in Tissue written by Roy Gerardus Maria Kolkman and published by . This book was released on 2002 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Vinod K. Sharma
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (43 download)
Download or read book Laser Doppler Vibrometer for Efficient Structural Health Monitoring written by Vinod K. Sharma and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The research effort in this thesis is devoted to develop techniques to accurately and rapidly identify the location, orientation, and magnitude of the defects by using structural health monitoring concepts that use Laser Doppler Vibrometer as a non-contact sensor with multi-point sensing capability. The first research area addresses the formulation and validation of an innovative Damage Measure that is based on the ratios of the strain energy distributions of the damaged and undamaged structure. The innovations include use of a single set of actuator/sensor pair to excite and detect the responses of a structure for low frequency vibrations as well as guided wave propagation studies. A second new capability is the estimation of the Damage Measure without requiring any knowledge of the undamaged baseline structure. This method is made possible because of the development of these new technologies: Spatial Decimation and Wavenumber/Frequency filtering. The third contribution is to develop analytical models for the structural dynamics of damaged structure and seek solutions that use perturbation methods to detect damage in a plate structure. The fourth contribution is the development of a comprehensive damage detection technique over a wide frequency dynamic range. The fifth topic of research involves automation in Structural Health Monitoring based on the comprehensive Damage Measure formulation. Under the control of software the Scanning Laser Doppler Vibrometer is used to acquire the low frequency vibration mode data for a coarse identification of all the suspect regions of damage using a threshold criterion on the Damage Measure. Each suspect region of damage is further investigated using the high frequency elastic wave propagation to clearly identify the location, orientation, and extent of the damage. The computer control of the Laser Doppler Vibrometer and a quantitative assessment of the damage provide the enabling technologies for the automation proof of concept. Finally the developed techniques of damage detection are successfully demonstrated on practical structures such as a turbine blade in the laboratory and an F-15 vertical tail in field maintenance conditions.
Author : A.P. Shepherd
Publisher : Springer Science & Business Media
ISBN 13 : 1475720831
Total Pages : 404 pages
Book Rating : 4.4/5 (757 download)
Download or read book Laser-Doppler Blood Flowmetry written by A.P. Shepherd and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dance along the artery The circulation on the lymph Are figured in the drift of stars. T. S. Eliot Die Methode ist alles. Carl Ludwig In physiology a spirit of finesse is required. Claude Bernard Armed with modern Doppler instrumentation, scientists can now quantify the red blood cell's "dance along the artery" as well as "the drift of stars. " In disciplines of science and medicine ranging from cardiology to astronomy, the Doppler principle now provides invaluable velo city measurements in the microcosm of capillary beds and in the cosmos. The newest appiication of the ubiquitous Doppler principle, laser-Doppler velocimetry, has been used to measure blood ftow in tissue for just a few years, but we perceived that, like most new techniques, the birth of laser-Doppler blood ftowmetry was not easy, nor was it likely to pass through infancy and reach maturity without difficulty. In physiology and medicine, better techniques for measur ing blood ftow are constantly in demand, but they often exhibit an unfortun ate boom-and-bust cyde: widespread acceptance and uncritical use are soon xiii xiv Preface followed by studies delineating the limits of the method's validity. The technique is then abandoned for the next more fashionable one, thus proving Ludwig's dictum that a given method is everything or nothing depending upon whether one can believe the data it yields.
Author : Alexander Nikolaevich Serov
Publisher :
ISBN 13 : 9789036517072
Total Pages : 122 pages
Book Rating : 4.5/5 (17 download)
Download or read book Novel Instruments for Remote and Direct-contact Laser Doppler Perfusion Imaging and Monitoring written by Alexander Nikolaevich Serov and published by . This book was released on 2002 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Paul Wesley Langston
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (668 download)
Download or read book Implementation and Evaluation of a Two-dimensional Laser Doppler Vibrometer System for Non-contact Monitoring of External Stress Loading of Aluminum Samples written by Paul Wesley Langston and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis details the development and validation of a laser Doppler vibrometer-based measurement system that is capable of quantifying not only the normal vibration of a solid body but also the component of vibration that is parallel to the plane containing the surface of interest. LDV manufacturers produce various devices that capture 3D measurements in a beam configuration that can be used to decompose the measured signals into not only the normal velocity of the surface of an object but also two orthogonal in-plane components of the vibration. It was a slightly simplified two-dimensional version of this approach that was chosen for implementation in the Wave Physics Lab using individual components to create a cheaper, more flexible system than those produced by companies such as Polytec. The goal of this system is to facilitate the exploration and discovery of areas and applications where 2D measurement may provide a more complete and precise view of the physics of different phenomena. Upon completion of the system development and validation, a study was done that sought to measure the acoustoelastic effect in an Aluminum plate by measuring how increasing loads alter both the normal and in-plane components of Lamb wave propagation in the plate. The acoustoelastic effect is the effect of stress on wave speed caused by non-linearity in the propagation medium.
Author : Alan D. Kaplan
Publisher :
ISBN 13 :
Total Pages : 162 pages
Book Rating : 4.:/5 (76 download)
Download or read book Information Processing for Biological Signals written by Alan D. Kaplan and published by . This book was released on 2011 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: Signals associated with biological activity in the human body can be of great value in clinical and security applications. Since direct measurements of critical biological activity are often difficult to acquire noninvasively, many biological signals are measured from the surface of the skin. This simplifies the signal acquisition, but complicates post processing tasks. Modeling these signals using the underlying physics may not be accurate due to the inherent complexities of the human body. The appropriate use of such models depends on the application of interest. Models developed in this dissertation are motivated by underlying physiology and physics, and are capable of expressing a wide range of signal variability without explicitly invoking physical quantities. An approach for the processing of biological signals is developed using graphical models. Graphical models describe conditional dependence between random variables on a graph. When the graph is a tree, efficient algorithms exist to compute sum-marginals or max-marginals of the joint distribution. Some of the variables correspond to the measured signal, while others may represent the hidden internal dynamics that generate the observed data. Three levels of hidden dynamics are outlined, which enable models to be constructed that track internal dynamics on differing time scales. Expectation maximization algorithms are used to compute parameter estimates. Experimental results of this approach are presented for a novel method of recording bio-mechanical activity using a Laser Doppler Vibrometer. The LDV measures surface velocity on the basis of the Doppler shift. This device is targeted on the neck overlying the carotid artery, and the proximity of the carotid to the skin results in a strong signal. Vibrations and movements from within the carotid are transmitted to the surface of the skin, where they are sensed by the LDV. Changes in the size of the carotid due to variations in blood pressure are sensed at the skin surface. In addition, breathing activity may be inferred from the LDV signal. Individualized models are evaluated systematically on LDV data sets that were acquired under resting conditions on multiple occasions. Model fit is evaluated both within and across recording sessions. Model parameters are interpreted in terms of the underlying physiology. Pressure wave physics in a series of elastic tubes is presented to explore the underlying physics of blood flow in the carotid. Mechanical movements of the carotid walls are related to the underlying pressure, and therefore the cardiovascular activity of the heart and vasculature. This analysis motivates a model that can be estimated from experimental data. Resulting models are interpreted for the LDV signal. The graphical models are applied to the problem of identity verification using the LDV signal. Identity verification is an important problem in which the claimed identity is either accepted or rejected by an automated system. The system design that is used is based on a loglikelihood ratio test using models that are trained during an enrollment phase. A score is computed and compared to a threshold. Performance is given in the form of False Nonmatch and False Match empirical error rates as a function of the threshold. Confidence intervals are computed that take into account correlations between the system decisions.
Author : Mei Chen
Publisher :
ISBN 13 :
Total Pages : 134 pages
Book Rating : 4.:/5 (759 download)
Download or read book Laser Doppler Vibrometry Measures of Physiological Function written by Mei Chen and published by . This book was released on 2009 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to increasing requirements for security, the application and importance of biometrics is growing at a rapid pace. Biometrics is the science of using physiological or behavioral characteristics to determine or verify attributes of a person, including identity. Fingerprints, iris scans, face images, and retina scans are examples of measurements of physiological characteristics that have been proposed and are being used as biometrics. Gait and signature are two primarily behavioral characteristics that have been explored for their use as biometrics. More biometric systems are under development as current biometric technologies satisfy those attributes with mixed success. In biometric recognition, two key properties for useful biometrics are their ability to distinguish among individuals and their stability over time. A novel approach of measuring carotid pulse signals via a laser Doppler vibrometer remotely is proposed. Laser Doppler Vibrometry (LDV) is used to sense vibration on the surface of the skin above the carotid artery. This motion is related to arterial wall movements associated with the central blood pressure pulse. The non-contact basis of the LDV method has several potential benefits related to non-intrusiveness. To enhance the technical quality of the laser signal during this developmental effort, a small patch (1 cm2) of reflective tape was affixed to the recording site. The biometric capabilities of Laser Doppler Vibrometry (LDV) signals are evaluated. Several recognition methods are proposed that use the temporal and/or spectral information in the signal to assess biometric performance both on an intra-session basis, and on an inter-session basis involving testing repeated after delays of 1 week to 6 months. A waveform decomposition method that utilizes principal component analysis is used to model the signal in the time domain. Authentication testing for this approach produces an equal-error rate (EER) of 0.5% for intra-session testing. However, performance degrades substantially for inter-session testing, requiring a more robust approach to modeling. Improved performance is obtained using techniques based on time-frequency decomposition, incorporating a method for extracting informative components. Biometric fusion methods including data fusion and information fusion are applied to train models using data from multiple sessions. As currently implemented, this approach yields an inter-session EER of 6.3%. LDV biometric performance under moderate exercise is tested. A protocol is set up to produce changes in heart rate by physical exercise. Spectrogram based approaches are applied with an EER of 3.6% for inter-state tests, indicating that the LDV pulse signal is stable after moderate physical exercise. The performance degrades during exercise, but improves within 30 seconds as the heart rate recovers during the rest period. The results suggest that the variability caused by heart rate fluctuations and respiration changes decreases within a short time.
Author : Abraham Johannes Oberholster
Publisher :
ISBN 13 :
Total Pages : 284 pages
Book Rating : 4.:/5 (76 download)
Download or read book The Application of Eulerian Laser Doppler Vibrometry to the On-line Condition Monitoring of Axial-flow Turbomachinery Blades written by Abraham Johannes Oberholster and published by . This book was released on 2010 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Richard M. Millis
Publisher :
ISBN 13 : 9789535167624
Total Pages : 404 pages
Book Rating : 4.1/5 (676 download)
Download or read book Advances in Electrocardiograms written by Richard M. Millis and published by . This book was released on 2012 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electrocardiograms are one of the most widely used methods for evaluating the structure-function relationships of the heart in health and disease. This book is the first of two volumes which reviews recent advancements in electrocardiography. This volume lays the groundwork for understanding the technical aspects of these advancements. The five sections of this volume, Cardiac Anatomy, ECG Technique, ECG Features, Heart Rate Variability and ECG Data Management, provide comprehensive reviews of advancements in the technical and analytical methods for interpreting and evaluating electrocardiograms. This volume is complemented with anatomical diagrams, electrocardiogram recordings, flow diagrams and algorithms which demonstrate the most modern principles of electrocardiography. The chapters which form this volume describe how the technical impediments inherent to instrument-patient interfacing, recording and interpreting variations in electrocardiogram time intervals and morphologies, as well as electrocardiogram data sharing have been effectively overcome. The advent of novel detection, filtering and testing devices are described. Foremost, among these devices are innovative algorithms for automating the evaluation of electrocardiograms.
Author : Sudhakar K. Venkatesh
Publisher : Springer
ISBN 13 : 1493915754
Total Pages : 143 pages
Book Rating : 4.4/5 (939 download)
Download or read book Magnetic Resonance Elastography written by Sudhakar K. Venkatesh and published by Springer. This book was released on 2014-10-01 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first book to cover the groundbreaking development and clinical applications of Magnetic Resonance Elastography, this book is essential for all practitioners interested in this revolutionary diagnostic modality. The book is divided into three sections. The first covers the history of MRE. The second covers technique and clinical applications of MRE in the liver with respect to fibrosis, liver masses, and other diseases. Case descriptions are presented to give the reader a hands-on approach. The final section presents the techniques, sequence and preliminary results of applications in other areas of the body including muscle, brain, lung, heart, and breast.
Author : Chi-hau Chen
Publisher : World Scientific
ISBN 13 : 9812704094
Total Pages : 682 pages
Book Rating : 4.8/5 (127 download)
Download or read book Ultrasonic and Advanced Methods for Nondestructive Testing and Material Characterization written by Chi-hau Chen and published by World Scientific. This book was released on 2007 with total page 682 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultrasonic methods have been very popular in nondestructive testing and characterization of materials. This book deals with both industrial ultrasound and medical ultrasound. The advantages of ultrasound include flexibility, low cost, in-line operation, and providing data in both signal and image formats for further analysis. The book devotes 11 chapters to ultrasonic methods. However, ultrasonic methods can be much less effective with some applications. So the book also has 14 chapters catering to other or advanced methods for nondestructive testing or material characterization. Topics like structural health monitoring, Terahertz methods, X-ray and thermography methods are presented. Besides different sensors for nondestructive testing, the book places much emphasis on signal/image processing and pattern recognition of the signals acquired.
Author : Michel Bruneau
Publisher : John Wiley & Sons
ISBN 13 : 1118622863
Total Pages : 704 pages
Book Rating : 4.1/5 (186 download)
Download or read book Materials and Acoustics Handbook written by Michel Bruneau and published by John Wiley & Sons. This book was released on 2013-05-10 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by a group of acoustics and vibration specialists, this book studies the acoustic and vibrating phenomena that occur in diverse materials used for all kinds of purposes. The first part studies the fundamental aspects of propagation: analytical, numerical and experimental. The second part outlines industrial and medical applications. Covering a wide range of topics that associate materials science with acoustics, this will be of invaluable use to researchers, engineers, or practitioners in this field, as well as students in acoustics, physics, and mechanics.
Author : Vitaliĭ Ėduardovich Gusev
Publisher : American Institute of Physics
ISBN 13 :
Total Pages : 304 pages
Book Rating : 4.3/5 (91 download)
Download or read book Laser Optoacoustics written by Vitaliĭ Ėduardovich Gusev and published by American Institute of Physics. This book was released on 1993 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: Market: Researchers in optoacoustics, laser interactions with fluids and solids, and nondestructive evaluation by laser ultrasonics. Written by two of the world's recognized authorities in this rapidly growing discipline, this volume offers an in-depth description of new techniques for non-contact ultrasonic measurement based on the use of laser optics.
Author : Jean-Michel Escoffre
Publisher : Springer
ISBN 13 : 3319225367
Total Pages : 459 pages
Book Rating : 4.3/5 (192 download)
Download or read book Therapeutic Ultrasound written by Jean-Michel Escoffre and published by Springer. This book was released on 2015-10-20 with total page 459 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights advances and prospects of a highly versatile and dynamic research field: Therapeutic ultrasound. Leading experts in the field describe a wide range of topics related to the development of therapeutic ultrasound (i.e., high intensity focused ultrasound, microbubble-assisted ultrasound drug delivery, low intensity pulsed ultrasound, ultrasound-sensitive nanocarriers), ranging from the biophysical concepts (i.e., tissue ablation, drug and gene delivery, neuromodulation) to therapeutic applications (i.e., chemotherapy, sonodynamic therapy, sonothrombolysis, immunotherapy, lithotripsy, vaccination). This book is an indispensable source of information for students, researchers and clinicians dealing with non-invasive image-guided ultrasound-based therapeutic interventions in the fields of oncology, neurology, cardiology and nephrology.
