Download or read book Compressive Sensing and Time Reversal Beamforming Approaches for Ultrasound Imaging written by Noura Hantira and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Time domain Compressive Beamforming for Medical Ultrasound Imaging written by Guillaume David and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, we define a mathematical framework for the beamforming of ultrasonic data compatible with Compressive Sensing. Then, we investigate its capabilities on simple simulations in terms of resolution and super-resolution. Finally, we adapt t-CBF to real-life ultrasonic data. In particular, we reconstruct 2D cardiac images at a frame rate 100-fold higher than typical values.
Download or read book Ultrasound B mode Imaging Beamforming and Image Formation Techniques written by Giulia Matrone and published by MDPI. This book was released on 2019-10-04 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultrasound medical imaging stands out among the other diagnostic imaging modalities for its patient-friendliness, high temporal resolution, low cost, and absence of ionizing radiation. On the other hand, it may still suffer from limited detail level, low signal-to-noise ratio, and narrow field-of-view. In the last decade, new beamforming and image reconstruction techniques have emerged which aim at improving resolution, contrast, and clutter suppression, especially in difficult-to-image patients. Nevertheless, achieving a higher image quality is of the utmost importance in diagnostic ultrasound medical imaging, and further developments are still indispensable. From this point of view, a crucial role can be played by novel beamforming techniques as well as by non-conventional image formation techniques (e.g., advanced transmission strategies, and compounding, coded, and harmonic imaging). This Special Issue includes novel contributions on both ultrasound beamforming and image formation techniques, particularly addressed at improving B-mode image quality and related diagnostic content. This indeed represents a hot topic in the ultrasound imaging community, and further active research in this field is expected, where many challenges still persist.
Download or read book Beamforming in Medical Ultrasound Imaging written by Babak Mohammadzadeh Asl and published by Springer Nature. This book was released on 2023-11-28 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with the concept of medical ultrasound imaging and discusses array signal processing in ultrasound. Signal processing using different beamforming techniques in order to achieve a desirable reconstructed image and, consequently, obtain useful information about the imaging medium is the main focus of this book. In this regard, the principles of image reconstruction techniques in ultrasound imaging are fully described, and the required processing steps are completely expanded and analyzed in detail. Simulation results to compare the performance of different beamformers are also included in this book to visualize their differences to the reader. Other advanced techniques in the field of medical ultrasound data processing, as well as their corresponding recent achievements, are also presented in this book. Simply put, in this book, processing of medical ultrasound data from different aspects and acquiring information from them in different manners are covered and organized in different chapters. Before going through the detailed explanation in each chapter, it gives the reader an overview of the considered issue and focuses his\her mind on the challenge ahead. The contents of the book are also presented in such a way that they are easy for the reader to understand. This book is recommended for researchers who study medical ultrasound data processing.
Download or read book Sub wavelength Imaging Methodology for Medical Ultrasound Applications written by Swetha Susan George and published by . This book was released on 2017 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Due to its inexpensive and non-invasive nature, ultrasound imaging has become the preferred medical imaging modality. Despite its high demand, its use is limited due to the fact that ultrasound images suffer from noise and image artifacts such as sidelobes and reverberation artifacts. Over the past decades, a vast amount of research has been carried out to improve the resolution and contrast of images through various techniques that are based on adjusting the shape of the ultrasonic excitation, or improving the so-called beamforming function at the receiver side, or utilizing image post-processing. In this thesis, there are three novel ultrasound imaging methods discussed. The first technique, named Compressive Ultrasound or CU is based on applying randomized transform to the RF data and thereafter compressing the data, thus reducing the hardware requirements. The random modulation at the receiver side ensures that the frequency content is spread across the entire spectrum, thus conserving information. The results from this method are compared to traditional ultrasound B-mode images.The proposed method exhibits imaging contrast and resolution similar to traditional ultrasound but with much reduced computational complexity compared to compressive sensing techniques. Next, a coherent imaging methodology referred to as Ultrasound Coherent Imaging (UCI) is presented. This method is based on model characterization of the medium being imaged and convex optimization methods for image reconstruction. The UCI method deploys front-end architectures and post-processing steps of image reconstruction that are dramatic departure from conventional approaches and has the potential to disrupt the state-of-the-art in ultrasound imaging. Experiments using the Verasonics ultrasound scanner and simulations using Field II MATLAB package were performed for various phantoms. The results showed images of high contrast ratio and super-resolution capabilities when compared to images from traditional B-mode ultrasound. It has been experimentally verified that the UCI technique is able to achieve a spatial resolution 13 times better than the traditional US (depth of 9 cm). Lastly, an optimal ultrasound system with the resolution capabilities of the Ultrasound Coherent Imaging method and optimized hardware architecture from the proposed Compressive Ultrasound is presented. The reduced computational and hardware complexity has made this design a good candidate for future portable ultrasound systems with super-resolution capabilities."--Pages ix-x.
Download or read book Ultrasound B mode Imaging Beamforming and Image Formation Techniques written by Giulia Matrone and published by . This book was released on 2019 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultrasound medical imaging stands out among the other diagnostic imaging modalities for its patient-friendliness, high temporal resolution, low cost, and absence of ionizing radiation. On the other hand, it may still suffer from limited detail level, low signal-to-noise ratio, and narrow field-of-view. In the last decade, new beamforming and image reconstruction techniques have emerged which aim at improving resolution, contrast, and clutter suppression, especially in difficult-to-image patients. Nevertheless, achieving a higher image quality is of the utmost importance in diagnostic ultrasound medical imaging, and further developments are still indispensable. From this point of view, a crucial role can be played by novel beamforming techniques as well as by non-conventional image formation techniques (e.g., advanced transmission strategies, and compounding, coded, and harmonic imaging). This Special Issue includes novel contributions on both ultrasound beamforming and image formation techniques, particularly addressed at improving B-mode image quality and related diagnostic content. This indeed represents a hot topic in the ultrasound imaging community, and further active research in this field is expected, where many challenges still persist.
Download or read book Beamforming Approaches for Ultrafast Nonlinear Ultrasound Imaging written by Ting-Yu Lai and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent advances in ultrafast contrast imaging have facilitated innovations such as super-resolutionimaging and ultrafast contrast-enhanced Doppler imaging (Chapter 1). It has become evident that combining ultrafast imaging with tissue harmonic imaging (THI) may offer improvements in image quality in clinical areas such as 4D THI and harmonic color flow (Chapter 1). In the first half of this work, we investigated the feasibility of combining ultrafast imaging with THI. We began with developing a numerical solution based on the Khokhlov-Zabolotskaya-Kuznetsov (KZK) to model the nonlinear propagation of sound beams produced by diagnostic arrays in tissue (Chapter 2). We then expanded our research for ultrafast THI and investigated the harmonic generation of a matrix array for identifying optimal beamforming strategies for 4D cardiac THI (Chapter 3). In the second half of this work, we proposed imaging approaches for improving tissue signal suppression and contrast sensitivity for ultrafast contrast imaging. We began with investigating the linear signal cancellation (tissue signal suppression) performance of the Verasonics research ultrasound scanner and compared it with the Philips iU22 (Chapter 4). We then studied the phase response of the microbubbles and tissue, and presented evidence that unique microbubble nonlinear dynamics can produce a phase response that can be used as a segmentation tool to further improve tissue signal suppression in contrast imaging (Chapter 5). Finally, we identified an aperture pattern for AM that improves the tissue signal suppression compared to the conventional AM. We also demonstrated that the additional phase response induced by the spatial difference between complementary half amplitude fields in OAM pulse sequences is useful for improving phase segmentation and image contrast (Chapter 6). We concluded with a summary of all the results and accomplishments and future directions of this work (Chapter 7).
Download or read book Gradient driven and Reduced rate Beamforming for Biomedical Ultrasound written by Solmaz Khezerloo and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Adaptive heal-doming can significantly improve the image quality in biomedical ultrasound by reducing the clutter due to interfering signals arriving from undesired directions. Adaptive beamforming is computationally expensive, and the objective of this thesis is to expose and explore tradeoffs between computational complexity and quality of adaptive beamforming. We consider the conventional linearly constrained minimum variance (LCMV) adaptive beamformer, applied to B-mode ultrasound imaging, and study an alternative based on the well-known generalized sidelobe canceller (GSC) whose adaptation relies on unconstrained gradient-driven optimization. To our knowledge, this is the first time a GSC-based gradient-driven approach has been applied and evaluated in the context of ultrasound beamforming. As another alternative to the conventional LCMV method, we also propose and evaluate a simple idea of updating the beamformer's weight vector at a reduced rate. Both approaches have lead to significant computational savings, but they also sacrifice beamforming optimality. Our simulations show that despite suboptimal beamforming. the ultrasound image quality remains acceptable.
Download or read book Real time Three dimensional Ultrasound Imaging Using Synthetic Aperture Beamforming written by Christopher R. Hazard and published by . This book was released on 2001 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High Frequency Ultrasound Beamforming for a Minimally Invasive Endoscopic Probe written by Christopher Samson and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many surgeries are trending toward minimally-invasive procedures to reduce patient recovery times and produce fewer complications. These procedures are characterized by having small surgical openings, making it difficult to use medical imaging equipment not specifically designed to fit into small openings. Clinicians use laparoscopes or other optical microscopes as the primary tools for endoscopic surgeries, but these tools only provide imaging at the surface and lack depth-resolved information that would be of utmost value. Recently, a high-frequency endoscopic phased-array imaging probe has been developed which provides an unprecedented combination of depth-resolved imaging resolution with a minimally-invasive form factor (2.5 x 3.0 mm). This technology has the potential to provide enhanced image guidance capabilities to a wide array of surgical applications. To be suitable for medical imaging applications we developed a suitable electronic imaging system, commonly referred to as a beamformer, to support this imaging probe. This system was the world's first real-time beamformer for high-frequency phased array imaging and uses a newly developed variable sampling scheme termed the 'One Sample per Pixel' technique for image formation. This hardware and imaging technique generate high-quality ultrasonic images in real-time. We improved on the system's capabilities by implementing ultrafast imaging techniques that greatly increased the system's usefulness while simultaneously developing a new ultrafast imaging technique for sector imaging called sparse orthogonal diverging wave imaging (SODWI), which offers a variety of advantages over similar techniques. These capabilities were applied to functional ultrasound imaging in a preclinical setting where we were able to detect the neurological activation of auditory structures in rats, in particular, the inferior colliculus. This functional ultrasound experiment was performed through a 3.5 x 6.0 mm opening, which is smaller than any previous functional ultrasound experiments in the literature. Future directions for developing the system and new applications of these technologies are described.
Download or read book Adaptive Beamforming for Medical Ultrasound Imaging written by Iben Kraglund Holfort and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook of Ultra Wideband Short Range Sensing written by Jürgen Sachs and published by John Wiley & Sons. This book was released on 2012-12-26 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ranging from the theoretical basis of UWB sensors via implementation issues to applications, this much-needed book bridges the gap between designers and appliers working in civil engineering, biotechnology, medical engineering, robotic, mechanical engineering, safety and homeland security. From the contents: * History * Signal and systems in time and frequency domain * Propagation of electromagnetic waves (in frequency and time domain) * UWB-Principles * UWB-antennas and applicators * Data processing * Applications
Download or read book Applied Underwater Acoustics written by Thomas Neighbors and published by Elsevier. This book was released on 2017-01-19 with total page 982 pages. Available in PDF, EPUB and Kindle. Book excerpt: Applied Underwater Acoustics meets the needs of scientists and engineers working in underwater acoustics and graduate students solving problems in, and preparing theses on, topics in underwater acoustics. The book is structured to provide the basis for rapidly assimilating the essential underwater acoustic knowledge base for practical application to daily research and analysis. Each chapter of the book is self-supporting and focuses on a single topic and its relation to underwater acoustics. The chapters start with a brief description of the topic's physical background, necessary definitions, and a short description of the applications, along with a roadmap to the chapter. The subtopics covered within individual subchapters include most frequently used equations that describe the topic. Equations are not derived, rather, assumptions behind equations and limitations on the applications of each equation are emphasized. Figures, tables, and illustrations related to the sub-topic are presented in an easy-to-use manner, and examples on the use of the equations, including appropriate figures and tables are also included. - Provides a complete and up-to-date treatment of all major subjects of underwater acoustics - Presents chapters written by recognized experts in their individual field - Covers the fundamental knowledge scientists and engineers need to solve problems in underwater acoustics - Illuminates, in shorter sub-chapters, the modern applications of underwater acoustics that are described in worked examples - Demands no prior knowledge of underwater acoustics, and the physical principles and mathematics are designed to be readily understood by scientists, engineers, and graduate students of underwater acoustics - Includes a comprehensive list of literature references for each chapter
Download or read book Diagnostic Ultrasound written by Peter R. Hoskins and published by Cambridge University Press. This book was released on 2010-06-17 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: All healthcare professionals practising ultrasound in a clinical setting should receive accredited training in the principles and practice of ultrasound scanning. This second edition of Diagnostic Ultrasound: Physics and Equipment provides a comprehensive introduction to the physics, technology and safety of ultrasound equipment, with high quality ultrasound images and diagrams throughout. It covers all aspects of the field at a level intended to meet the requirements of UK sonography courses. New to this edition: • Updated descriptions of ultrasound technology, quality assurance and safety. • Additional chapters dedicated to 3D ultrasound, contrast agents and elastography. • New glossary containing definitions of over 500 terms. The editors and contributing authors are all authorities in their areas, with contributions to the scientific and professional development of ultrasound at national and international level.
Download or read book Photons Plus Ultrasound written by Alexander A. Oraevsky and published by . This book was released on 2012 with total page 808 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes Proceedings Vol. 7821
Download or read book Diagnostic Ultrasound Imaging Inside Out written by Thomas L. Szabo and published by Academic Press. This book was released on 2013-12-05 with total page 829 pages. Available in PDF, EPUB and Kindle. Book excerpt: Diagnostic Ultrasound Imaging provides a unified description of the physical principles of ultrasound imaging, signal processing, systems and measurements. This comprehensive reference is a core resource for both graduate students and engineers in medical ultrasound research and design. With continuing rapid technological development of ultrasound in medical diagnosis, it is a critical subject for biomedical engineers, clinical and healthcare engineers and practitioners, medical physicists, and related professionals in the fields of signal and image processing. The book contains 17 new and updated chapters covering the fundamentals and latest advances in the area, and includes four appendices, 450 figures (60 available in color on the companion website), and almost 1,500 references. In addition to the continual influx of readers entering the field of ultrasound worldwide who need the broad grounding in the core technologies of ultrasound, this book provides those already working in these areas with clear and comprehensive expositions of these key new topics as well as introductions to state-of-the-art innovations in this field. - Enables practicing engineers, students and clinical professionals to understand the essential physics and signal processing techniques behind modern imaging systems as well as introducing the latest developments that will shape medical ultrasound in the future - Suitable for both newcomers and experienced readers, the practical, progressively organized applied approach is supported by hands-on MATLAB® code and worked examples that enable readers to understand the principles underlying diagnostic and therapeutic ultrasound - Covers the new important developments in the use of medical ultrasound: elastography and high-intensity therapeutic ultrasound. Many new developments are comprehensively reviewed and explained, including aberration correction, acoustic measurements, acoustic radiation force imaging, alternate imaging architectures, bioeffects: diagnostic to therapeutic, Fourier transform imaging, multimode imaging, plane wave compounding, research platforms, synthetic aperture, vector Doppler, transient shear wave elastography, ultrafast imaging and Doppler, functional ultrasound and viscoelastic models
Download or read book The Journal of the Acoustical Society of America written by Acoustical Society of America and published by . This book was released on 2001 with total page 1592 pages. Available in PDF, EPUB and Kindle. Book excerpt:
