Author: Jan-Ulco A. KluiwstraPublisher:
ISBN:
Category :
Languages : en
Pages : 328
Book Description
High Intensity Focused Ultrasound Phased Arrays for Myocardial Ablation
Author: Jan-Ulco A. KluiwstraPublisher:
ISBN:
Category :
Languages : en
Pages : 328
Book Description
Design Strategies for Two-dimensional Phased Arrays for Use in Transesophageal Cardiac Ablation with Focused Ultrasound
Author: Derek Robert FlakePublisher:
ISBN: 9780494526880
Category :
Languages : en
Pages : 154
Book Description
Although a cure for atrial fibrillation is known, its implementation remains a high-risk procedure. Simulations have shown that, when inserted through the esophagus, a two-dimensional (2-D) high power ultrasonic phased array can focus to a precise spot of adequate size and accuracy in order to coagulate heart tissue and modify the electrical pulse conduction path in cardiac muscle. The goal of this study is to determine a feasible method of constructing a 2-D phased array for use in transesophageal cardiac ablation. A method for reliable and fine scale 2-D interconnection was developed involving a semi-conductor fabrication technique known as wire-bonding. Several transducer array prototypes were built in the 1MHz to 1.5MHz range. Their acoustic focusing capability was measured and compared to simulations. The particle displacements on the transducer surfaces were measured using a laser vibrometer to determine the mechanical coupling between array elements.
Optimal Phased Array Pattern Synthesis for Non-invasive Cancer Ablation of Liver Tumors Using High Intensity Focused Ultrasound
Author: Youssry Y. BotrosDesign and Evaluation of a 2-D Planar Therapeutic Ultrasound Phased Array
Author: Danish Suleiman KhatriPublisher:
ISBN:
Category :
Languages : en
Pages : 134
Book Description
Focused ultrasound continues to be investigated as an exciting technique for several medical therapy applications including tissue ablation. Phased array transducers serve as important devices for delivering the high intensity focused ultrasound to the targeted tissue. These arrays often produce undesired secondary foci called grating lobes that can result in heating of non-targeted healthy tissue. Grating lobes can be eliminated by setting the element-spacing between adjacent elements to 2 or less. The aim of this research is to construct and evaluate a 2-D planar phased array with close to /2 element-spacing. A 7x7 element array with element-spacing of 0.762mm was constructed using 1,3-piezocomposite material. Acoustic field measurements of the array focused at three different locations were taken to demonstrate its ability to scan the focus in a volume. In addition, a maximum average intensity of 5.54W/cm2 was measured for the unfocused array using radiation force measurements.
Catheter Ablation of Cardiac Arrhythmias
Author: Shoei K. HuangPublisher: Elsevier Health Sciences
ISBN: 1437713688
Category : Medical
Languages : en
Pages : 672
Book Description
The breadth and range of the topics covered, and the consistent organization of each chapter, give you simple but detailed access to information on anatomy, diagnostic criteria, differential diagnosis, mapping, and ablation. the book includes a unique section on troubleshooting difficult cases for each arrhythmia, and the use of tables, illustrations, and high-quality figures is unmatched among publications in the field.
High-power Ultrasound Phased Arrays for Medical Applications
Author: Leonid R. GavrilovPublisher: Nova Science Publishers
ISBN: 9781633216150
Category : Ultrasonic waves
Languages : en
Pages : 0
Book Description
High intensity focused ultrasound (HIFU) is an increasingly popular physical tool with a wide range of applications in medicine. One of the drivers of this advancement is the development of ultrasound phased arrays, which, although more complex and costly than the traditional single focused bowl transducers used in earlier studies, are capable of electronically controlled dynamic focusing. Such systems not only steer a single focus without movement of the array itself, but can also generate several foci simultaneously and create focal regions with complex configurations. This book addresses the design, research and development, and medical applications of both relatively small HIFU arrays that can be inserted into body cavities (so called linear arrays) and larger two dimensional arrays for extracorporeal use. A key safety issue in the design of these arrays is to ensure that only targeted tissue is exposed to high levels of acoustic intensity and in this regard, this book highlights the advantages of designs involving spatial randomization of array elements to reduce the level of potentially dangerous grating lobes. In particular, phased arrays with a random distribution of elements are discussed and compared to regular arrays, and methods for calculating ultrasound fields generated by different phased arrays including the generation of multiple simultaneous foci and focal regions with complex geometrical shapes are presented. A detailed discussion of the influence of the dimensions, number, and shape of individual elements, errors in phase setting at the elements, and the frequency modulation of the signal on the quality of the intensity distributions produced by random arrays is included.
Catheter Ablation of Cardiac Arrhythmias E-book
Author: Shoei K. Stephen HuangPublisher: Elsevier Health Sciences
ISBN: 0323315658
Category : Medical
Languages : en
Pages : 803
Book Description
Whether you are in the lab or the office, stay current in the ever-evolving field of electrophysiology with Catheter Ablation of Cardiac Arrhythmias. Organized by type of arrhythmia, this simple yet comprehensive medical reference book provides detailed information on anatomy, diagnoses, mapping/ablation, and troubleshooting. The book also extensively covers the updated, basic concepts of transcatheter energy applications and currently available mapping/imaging tools for ablation. Improve accuracy with assistance from advanced catheter mapping and navigation systems, and the use of intracardiac echocardiography to assist accurate diagnosis and ablation. Stay current on timely topics like contemporary cardiac mapping and imaging techniques, atrial tachycardia and flutter, atrial fibrillation, atrioventricular nodal reentrant tachycardia, tachycardias related to accessory atrioventricular connections, and ventricular tachycardia, transseptal catheterization, ablation for pediatric patients, and patient safety and complications. Get the most comprehensive and detailed coverage of arrhythmias and ablation technologies, highlighted by a systematic approach to troubleshooting specific problems encountered in the laboratory - complete with solutions. Find the critical answers you need quickly and easily thanks to a consistent, highly user-friendly chapter format. Master each approach with exceptional visual guidance from tables, illustrations, and high-quality figures. Stay up to date with enhanced and expanded chapters, as well as several hundred new figures, web-based videos, and updated references. Explore recent developments in the areas of atrial fibrillation and ventricular tachycardias. Learn from experts in the field with nearly half of the chapters composed by new authors. Improve content knowledge in relation to anatomy with new chapters focusing on hemodynamic support during VT ablation, rotor mapping in atrial fibrillation, and hybrid procedures. Consult this title on your favorite e-reader, conduct rapid searches, and adjust font sizes for optimal readability.
Advances in High-Intensity Focused Ultrasound Ablation Research and Application: 2011 Edition
Author: Publisher: ScholarlyEditions
ISBN: 1464956936
Category : Medical
Languages : en
Pages : 22
Book Description
Advances in High-Intensity Focused Ultrasound Ablation Research and Application: 2011 Edition is a ScholarlyPaper™ that delivers timely, authoritative, and intensively focused information about High-Intensity Focused Ultrasound Ablation in a compact format. The editors have built Advances in High-Intensity Focused Ultrasound Ablation Research and Application: 2011 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about High-Intensity Focused Ultrasound Ablation in this eBook to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Advances in High-Intensity Focused Ultrasound Ablation Research and Application: 2011 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.
MRI-Guided Focused Ultrasound Surgery
Author: Ferenc A. JoleszPublisher: CRC Press
ISBN: 1420019937
Category : Medical
Languages : en
Pages : 217
Book Description
MRI-Guided Focused Ultrasound Surgery will be the first publication on this new technology, and will present a variety of current and future clinical applications in tumor ablation treatment. This source helps surgeons and specialists evaluate, analyze, and utilize MRI-guided focused ultrasound surgery - bridging the gap between phase 3 clinical tr
Advances in High-Intensity Focused Ultrasound Ablation Research and Application: 2012 Edition
Author: Publisher: ScholarlyEditions
ISBN: 1481629816
Category : Medical
Languages : en
Pages : 27
Book Description
Advances in High-Intensity Focused Ultrasound Ablation Research and Application / 2012 Edition is a ScholarlyPaper™ that delivers timely, authoritative, and intensively focused information about High-Intensity Focused Ultrasound Ablat in a compact format. The editors have built Advances in High-Intensity Focused Ultrasound Ablation Research and Application / 2012 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about High-Intensity Focused Ultrasound Ablat in this eBook to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Advances in High-Intensity Focused Ultrasound Ablation Research and Application / 2012 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.