Download or read book Design and Applications of Cold cathode X ray Imaging Systems written by Avilash Kalpathy Cramer and published by . This book was released on 2021 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt: X-ray computed tomography (CT) and planar x-ray imaging are mainstays of modern clinical care. The electron generation mechanism in standard x-ray tubes - specifically, a thermionic cathode - is reliable and capable of high current. However, thermionic cathodes are bulky, and cannot be pulsed quickly. Non-thermionic (’cold-cathode’) electron generation can be exploited to make a smaller and rapidly pulsable x-ray source. Such an x-ray source could improve not just the portability of x-ray devices, but would allow for a CT system to operate by pulsing a distributed ring of x-ray sources instead of rotating a single large x-ray source. Furthermore, cold-cathode x-ray sources could allow for new signal acquisition and processing paradigms in the x-ray domain. This includes time-based image acquisition techniques, such as elastography and photon-counting measurements. In this dissertation, I discuss (1) the development of two novel types of cold-cathode x-ray sources: an ultraviolet photocathode-based source, and a silicon field emission chip; (2) novel methods for planar x-ray image acquisition, including a demonstration of dynamic x-ray elastography using a pulsed photocathode x-ray source; and (3) applications of modern signal processing techniques to the tomographic image reconstruction problem. In an epilogue, I discuss our research on N95 respirator sterilization and re-use for crisis situations.
Download or read book Performance and Applications of a Cold Cathode Soft X ray Source written by James S. Solomon and published by . This book was released on 1969 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: The design and principles of operation of a cold cathode soft x-ray source are described for the production of soft x-rays. The source is versatile, very simple, and may be powered by either AC or DC high voltage power supplies. Discharge control is achieved with a fine metering valve or a commercially available Automatic Pressure Controller (A.P.C.). Measurements of x-ray stability and intensity were made with a continuously bending mica crystal spectrometer and electronics linked to a teletype system. Al Kalpha intensity as high as 71,420 counts per second was recorded. X-ray stability with a fine metering valve to control the discharge is fair for the first two or three hours of operation. With an A.P.C. the stability is greatly improved. The count rate is shown to have an average standard deviation of plus or minus 1% or less for the first hour of operation and no greater than 1.5% for longer periods of time (2 to 24 hours). Applications of the cold cathode source are shown for x-ray emission spectroscopy, soft x-ray radiography, and x-ray diffraction of long chain organic materials. (Author).
Download or read book The design and construction of an experimental MgO cold cathode X ray tube for use in XRF spectrometry written by Daniel Damjanovic and published by . This book was released on 2000 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book World Congress on Medical Physics and Biomedical Engineering September 7 12 2009 Munich Germany written by Olaf Dössel and published by Springer Science & Business Media. This book was released on 2010-01-01 with total page 1112 pages. Available in PDF, EPUB and Kindle. Book excerpt: Present Your Research to the World! The World Congress 2009 on Medical Physics and Biomedical Engineering – the triennial scientific meeting of the IUPESM - is the world’s leading forum for presenting the results of current scientific work in health-related physics and technologies to an international audience. With more than 2,800 presentations it will be the biggest conference in the fields of Medical Physics and Biomedical Engineering in 2009! Medical physics, biomedical engineering and bioengineering have been driving forces of innovation and progress in medicine and healthcare over the past two decades. As new key technologies arise with significant potential to open new options in diagnostics and therapeutics, it is a multidisciplinary task to evaluate their benefit for medicine and healthcare with respect to the quality of performance and therapeutic output. Covering key aspects such as information and communication technologies, micro- and nanosystems, optics and biotechnology, the congress will serve as an inter- and multidisciplinary platform that brings together people from basic research, R&D, industry and medical application to discuss these issues. As a major event for science, medicine and technology the congress provides a comprehensive overview and in–depth, first-hand information on new developments, advanced technologies and current and future applications. With this Final Program we would like to give you an overview of the dimension of the congress and invite you to join us in Munich! Olaf Dössel Congress President Wolfgang C.
Download or read book X Ray Imaging written by Harry E. Martz and published by CRC Press. This book was released on 2016-10-26 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt: While books on the medical applications of x-ray imaging exist, there is not one currently available that focuses on industrial applications. Full of color images that show clear spectrometry and rich with applications, X-Ray Imaging fills the need for a comprehensive work on modern industrial x-ray imaging. It reviews the fundamental science of x-ray imaging and addresses equipment and system configuration. Useful to a broad range of radiation imaging practitioners, the book looks at the rapid development and deployment of digital x-ray imaging system.
Download or read book Design and Development of a Compact X ray Tube for Stationary CT Architecture written by Ashish Vighnahar Avachat and published by . This book was released on 2018 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Multisource architectures enable sweeping one or more x-ray beams across the imaging field-of-view faster than physically moving a single x-ray source and/or a detector. Hence, these architectures are attractive for the applications in which temporal resolution plays an important role, for example, cardiac computed tomography (CT) or real-time CT. One of the recent developments in multisource architectures for CT imaging is stationary CT architecture, whereby two separate stationary arrays - one for x-ray sources and one for detectors - are utilized to sweep one or more x-ray beams along the gantry and acquire 360 degree projections. To have a stationary CT architecture and still acquire enough number of projections for a successful CT reconstruction, an array of closely spaced and individually addressable x-ray sources that are compact in size and are capable of producing x-ray pulses at a high frequency is required. This work is a part of a research continuum toward developing a compact x-ray tube potentially to be used in the said stationary CT architecture. The central hypothesis of the research conducted is that, a field emission (FE) based cold cathode and transmission type anode allow the size of an x-ray tube to be reduced, and still generate a required x-ray pulse. Specifically, this work entails the design of an electrostatic lens for electron focusing in a compact x-ray tube and the initial experimental studies of a prototype compact x-ray tube. Using particle-in-cell code, OOPIC PRO, electron field emission from CNT cathode and electron focusing by three types of electrostatic lenses--Single lens, Double lens, and Einzel lens --were simulated, compared, and studied for anode voltages of 30 kV p to 140 kV p. The first-generation prototype compact x-ray tube was developed and studied. The initial studies conducted to understand the performance of the prototype and its control parameters. After further optimization of size and testing, this compact x-ray tube design holds a potential to be used in a stationary CT architecture for improved temporal resolution."--Abstract, page iv.
Download or read book Modern Diagnostic X Ray Sources written by Rolf Behling and published by CRC Press. This book was released on 2015-06-26 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern Diagnostic X-ray Sources: Technology, Manufacturing, Reliability gives an up-to-date summary of X-ray source design for applications in modern diagnostic medical imaging. It lays a sound groundwork for education and advanced training in the physics of X-ray production and X-ray interactions with matter. The book begins with a historical over
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1990 with total page 996 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook of X ray Imaging written by Paolo Russo and published by CRC Press. This book was released on 2017-12-14 with total page 1477 pages. Available in PDF, EPUB and Kindle. Book excerpt: Containing chapter contributions from over 130 experts, this unique publication is the first handbook dedicated to the physics and technology of X-ray imaging, offering extensive coverage of the field. This highly comprehensive work is edited by one of the world’s leading experts in X-ray imaging physics and technology and has been created with guidance from a Scientific Board containing respected and renowned scientists from around the world. The book's scope includes 2D and 3D X-ray imaging techniques from soft-X-ray to megavoltage energies, including computed tomography, fluoroscopy, dental imaging and small animal imaging, with several chapters dedicated to breast imaging techniques. 2D and 3D industrial imaging is incorporated, including imaging of artworks. Specific attention is dedicated to techniques of phase contrast X-ray imaging. The approach undertaken is one that illustrates the theory as well as the techniques and the devices routinely used in the various fields. Computational aspects are fully covered, including 3D reconstruction algorithms, hard/software phantoms, and computer-aided diagnosis. Theories of image quality are fully illustrated. Historical, radioprotection, radiation dosimetry, quality assurance and educational aspects are also covered. This handbook will be suitable for a very broad audience, including graduate students in medical physics and biomedical engineering; medical physics residents; radiographers; physicists and engineers in the field of imaging and non-destructive industrial testing using X-rays; and scientists interested in understanding and using X-ray imaging techniques. The handbook's editor, Dr. Paolo Russo, has over 30 years’ experience in the academic teaching of medical physics and X-ray imaging research. He has authored several book chapters in the field of X-ray imaging, is Editor-in-Chief of an international scientific journal in medical physics, and has responsibilities in the publication committees of international scientific organizations in medical physics. Features: Comprehensive coverage of the use of X-rays both in medical radiology and industrial testing The first handbook published to be dedicated to the physics and technology of X-rays Handbook edited by world authority, with contributions from experts in each field
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1970 with total page 848 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book Design and Analysis of Low cost X ray Imaging System Incorporating Consumer Camera Imaging written by Logan B. Abel and published by . This book was released on 2018 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: X-ray imaging is a core component of our modern medical diagnosis arsenal in combatting a broad range of disease. X-ray imaging allows medical professionals to see the internal structure and layout of the human body, and in this way allows for the visualization of unseen ailments. A current “disease of poverty” which is the target of this study is tuberculosis, a lung bacteria which is visible on x-ray imaging. X-ray imaging is a well known and used technology, yet x-ray imaging remains very expensive and unwieldy for use in less-developed regions of the world. Within the last three to four decades, the world has seen a massive explosion in consumer camera technology development, largely driven by circuit miniaturization, and this has led to cheaper and higher resolution cameras being produced. X-ray images themselves rely on a material to turn x-rays, the photons which pass through the person in medical imaging, into electrical signals which can be read by a computer. This collection of x-ray photons can be done through the coupling of a scintillating screen and a camera which images the scintillating screen to create an x-ray image. This study explores this particular method of x-ray imaging which is likely to be cheaper than existing methods of x-ray imaging, yet also likely yields images of poorer resolution and contrast distinction in x-ray images. The theoretical components necessary to setup such a system in the most efficient manner possible were analyzed, taking into consideration safety and finance constraints. The imaging capabilities of a Nikon D810 (f/1.4, 50 mm lens) and iPhone 5S (f/2.2 lens), higher and lower quality cameras respectively, were analyzed using three scintillating screens, the MCI Optonix DRZ High, Scintacor DRZ Medium, and Scintacor DRZ Ultrafine screens, to capture the x-rays produced from a 14 mA 100 kV x-ray tube. It was found that the Nikon D810 coupled with the MCI Optonix DRZ High Screen produced results similar in performance to current medical imaging, and the iPhone 5S images were too noisy to be conclusive. Further work should go into developing a more finalized and standalone product that can be tested in clinically important settings, as this study does provide the proof-of-concept framework for this to be possible.
Download or read book The Handbook of Nanomedicine written by Kewal K. Jain and published by Springer Science & Business Media. This book was released on 2008-02-24 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook covers the broad scope of nanomedicine. Starting with the basics, the subject is developed to potential clinical applications, many of which are still at an experimental stage. The book features extensive coverage of nanodiagnostics and nanopharmaceuticals, which are two important components of nanomedicine. Written by a physician-scientist author who blends his clinical experience and scientific expertise in new technologies, this book provides a definitive account of nanomedicine. It offers more up-to-date and comprehensive coverage of nanomedicine than any other comparable work.
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1975 with total page 1396 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design and Characterization of an 8x8 Lateral Detector Array for Digital X ray Imaging written by Christos Hristovski and published by . This book was released on 2010 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: X-ray imaging has become one of the most pervasive and effective means of diagnosis in medical clinics today. As more imaging systems transition to digital modes of capture and storage, new applications of x-ray imaging, such as tomosynthesis, become feasible. These new imaging modalities have the potential to expose patients to large amounts of radiation so the necessity to use sensitive imagers that reduce dose and increase contrast is essential. An experimental design that utilizes laterally oriented detectors and amorphous semiconductors on crystalline silicon substrates has been undertaken in this study. Emphasis on fabricating a device suitable for medical x-ray imaging is the key principle throughout the design process. This study investigates the feasibility and efficiency of a new type of x-ray imager that combines the high speed, low noise, and potential complexity of CMOS circuit design with the high responsivity, large area uniformity, and flexibility of amorphous semiconductors. Results show that the design tradeoffs made in order to create a low cost, high fill factor, and high speed imager are realistic. The device exhibits good responsivity to optical light, possesses a sufficient capacitive well, and maintains CMOS characteristics. This study demonstrates that with sufficient optimization it may be possible to design and deploy real time x-ray system on chip imagers similar to those used in optical imaging.
Download or read book Electrical Electronics Abstracts written by and published by . This book was released on 1997 with total page 1904 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physics in Medical Diagnosis written by T.A. Delchar and published by Springer Science & Business Media. This book was released on 1997 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: Physics has been applied to medical diagnosis for very nearly 400 years, and has now become an essential element of medical practice. This book concentrates on the theoretical basis of the physics which supports diagnostic techniques in modern clinical practice. Arising out of over a decade of teaching a course on medical physics to third year undergraduate students, the book has been structured so that individuals with a non-physics background, such as medical students or practitioners, can also benefit.
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1964 with total page 1528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
