Download or read book A New Holographic Method for Improving Lateral Resolution in Ultrasonic B scan Imaging written by Esko Alasaarela and published by . This book was released on 1981 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1983 with total page 1368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of Current Laser Abstracts written by and published by . This book was released on 1986 with total page 778 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Acoustical Imaging written by M. Kaveh and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 589 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume constitutes the proceedings of the Thirteenth Inter national Symposium on Acoustical Imaging which was held in Minneapolis, Minnesota during October 26-28, 1983. Forty-eight research papers were presented during the meeting by researchers from twelve countries, again demonstrating the true international character of these meetings. Of these presentations this volume contains forty-two complete manuscripts. The abstracts for addi tional papers that were not available at publication time are also included. According to the recent tradition of these symposia an inter disciplinary program under the general theme of acoustical imaging was organized. This can clearly be observed from the wide range of topics and approaches contained in the following manuscripts. There are papers of mathematical nature dealing with the basis of image formation and algorithms for digitally carrying out specific imaging tasks. One finds manuscripts dealing with the design and construction of imaging transducers as well as complete imaging systems. Applications include medical imaging and nondestructive testing, seismic and underwater imaging. This volume, therefore, should be of interest to active researchers in acoustical imaging as a report on current research and to workers in signal process ing, sonics and ultrasonics who are interested in exploring the diverse areas of application for their fields of interest. These proceedings are organized in seven topical sections, paral leling the sessions of the conference. These are: Inversion and Tomography, Microscopy, Scattering and Propagation, Tissue and Material Characterization, Signal Processing, Transducers and Arrays, Imaging Systems and Special Techniques.
Download or read book Acoustical Imaging written by Eric Ash and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 758 pages. Available in PDF, EPUB and Kindle. Book excerpt: The formation of images by ultrasound is a fascinating study, with well-established, yet rapidly growing, applic ations in medicine and with increasing relevance to a surprisingly disparate set of problems in the non-destructive examination of materials and components. The present volume is a record of the research presented at the Twelfth International Symposium on Acoustic Imaging, held in London during July 1982. Whilst, therefore, it offers primarily a snap-shot in time of a rapidly developing field, it is so organized that it will also serve as a high-speed entry into the literature for someone embarking, for the first time, on· researches in this branch of applied science. As in previous volumes, some of the work reported is concerned with topics which, whilst of critical importance to the performance of any imaging system, - e.g. transducers, signal processing may not address themselves to image formation per se. A new departure is the inclusion of photo-acoustic imaging a subject of rapidly growing importance for many of the same application areas relevant to acoustical imaging.
Download or read book Acoustic Imaging written by Glen Wade and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Medical Electronics written by and published by . This book was released on 1985 with total page 928 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Propagation Phasor Approach in Holographic Image Reconstruction written by Wei Luo and published by . This book was released on 2016 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: High-resolution and wide-field imaging is of great value for various scientific disciplines; such tasks demand the imaging modalities to possess large space-bandwidth products. The rapid evolutions of modern image sensor technologies and computing power have provided tremendous opportunities for development of new imaging systems with significantly larger space-bandwidth products than conventional lens-based systems. This dissertation introduces the latest advance in lensfree holographic microscopy, a computational imaging technique that serves as a potent solution for high-resolution, wide-field microscopy. By placing the specimen at a close proximity to the image sensor (e.g., ~100 m - 1 mm), lensfree microscopy runs at unit magnification and possesses significantly larger field-of-view (FOV) than conventional lens-based systems. There are two major challenges in lensfree holographic microscopy: (1) undersampling by the image sensor; and (2) phase retrieval of the light field. This work first shows that, by using the two-dimensional pixel function of an image sensor-array as an input to lensfree holographic image reconstruction, pixel super-resolution can improve the numerical aperture (NA) of the reconstructed image by a factor of ~3 compared to a raw lensfree image. This pixel super-resolution-based lensfree microscope, when combined with an ultra-violet (UV) light emitting diode (LED), is capable of resolving 225 nm line-width gratings and is useful for wide-field on-chip imaging of nano-scale objects such as helical multi-walled carbon nanotubes. To further increase the bandwidth of this imaging modality, I developed lensfree imaging using synthetic aperture (LISA), which delivers an effective numerical aperture of ~1.4 across a wide FOV of ~20 mm2. LISA utilizes multiple angles of illumination to holographically synthesize the largest numerical aperture for an on-chip microscope and enables color imaging of tissue samples, including pathology slides, using complex wave retrieval. In the pursuit of more efficient pixel super-resolution techniques, I developed a fundamentally new resolution enhancement technique, namely wavelength scanning pixel super-resolution. It relies on an iterative algorithm to generate high-resolution reconstructions of the specimen using undersampled diffraction patterns recorded at a few wavelengths, covering a narrow spectrum (~10-30 nm). When combined with synthetic aperture technique, this wavelength scanning super-resolution approach can achieve a resolution of ~250 nm, corresponding to a numerical aperture of ~1.0 across a wide field-of-view (>20 mm2). Compared to lateral displacement-based super-resolution, wavelength scanning brings uniform resolution improvement in all directions across the sensor array and requires significantly less number of measurements. The development of wavelength scanning pixel super-resolution eventually led to a new computational framework, termed as propagation phasor approach, which for the first-time combines pixel super-resolution and phase retrieval techniques into a unified mathematical framework. In contrast to previous holographic reconstruction algorithms, my new algorithm reduces the number of raw measurements by five to seven folds, while at the same time achieving a competitive resolution across a large field-of-view. These technological advances could greatly benefit the development of high-resolution, wide-field computational imaging modalities with compactness, cost-effectiveness and superior data efficiency.
Download or read book Imaging Processes and Coherence in Physics written by M. Schlenker and published by Springer. This book was released on 1980-02-28 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Acoustical Imaging written by Hugh W. Jones and published by Springer Science & Business Media. This book was released on 2013-03-08 with total page 670 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 15 follows the format of earlier volumes in the series. The contents give the next installment in the varied aspects of acoustical imaging research. On this occasion, some emphasis was placed on the rela tionship of l1nderwater acoustics to acoustical imaging and a volume of papers under the title "Underwater Acoustics Proceedings from the 12th ICA Symposium held in Halifax," will appear at roughly the same time as this volume. There is no duplication in these volumes but they are in terlinked, at least to the extent that papers from common conference sessions appear in one or another volume. An innovation is the review paper presented at the beginning of the volume "A History of Acoustical Imaging," by G Wade. This fairly detailed review comes at a point in time when so much has been achieved and in some cases passed by, that a record of some of the earlier work might help to keep a balance with the large collections of research papers which have appeared in the many volumes.
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1983 with total page 618 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the Annual Conference of the IEEE Engineering in Medicine and Biology Society written by IEEE Engineering in Medicine and Biology Society. Annual Conference and published by . This book was released on 1986 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NDE in Relation to Structural Integrity for Nuclear and Pressurised Components written by Gyoujin Cho and published by Woodhead Publishing. This book was released on 1999-03-12 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proceedings of a conference organized by the European Commission Joint Research Centre Institute of Advanced Materials. The conference was held in Amsterdam, the Netherlands in October 1998 and covered all aspects of this highly important subject including links between structural integrity requirements and NDE performance. The development of performance demonstration / qualification for NDE systems and experiance of their application in practice feature prominently. Development of improved NDE systems, new methods of NDE and methods for assessing NDE performance such as modeling are also included.
Download or read book Review and Discussion of the Development of Synthetic Aperture Focusing Technique for Ultrasonic Testing SAFT UT written by L. J. Busse and published by . This book was released on 1984 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modern Acoustical Imaging written by Institute of Electrical and Electronics Engineers and published by Institute of Electrical & Electronics Engineers(IEEE). This book was released on 1986 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physics Briefs written by and published by . This book was released on 1985 with total page 922 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Special Nondestructive Testing Methods written by Roderick K. Stanley and published by . This book was released on 1995 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt:
