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Author : Fredericke Schmidt
Publisher :
ISBN 13 :
Total Pages : 63 pages
Book Rating : 4.:/5 (838 download)
Download or read book Characterization and Correction of Spectral CT Image Artifacts written by Fredericke Schmidt and published by . This book was released on 2010 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Björn J. Heismann
Publisher : SPIE-International Society for Optical Engineering
ISBN 13 : 9780819492579
Total Pages : 0 pages
Book Rating : 4.4/5 (925 download)
Download or read book Spectral Computed Tomography written by Björn J. Heismann and published by SPIE-International Society for Optical Engineering. This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computed tomography (CT) is a widely used x-ray scanning technique. In its prominent use as a medical imaging device, CT serves as a workhorse in many clinical settings throughout the world. It provides answers to urgent diagnostic tasks such as oncology tumor staging, acute stroke analysis, or radiation therapy planning. Spectral Computed Tomography provides a concise, practical coverage of this important medical tool. The first chapter considers the main clinical motivations for spectral CT applications. In Chapter 2, the measurement properties of spectral CT systems are described. Chapter 3 provides an overview of the current state of research on spectral CT algorithms. Based on this overview, the technical realization of spectral CT systems is evaluated in Chapter 4. Device approaches such as DSCT, kV switching, and energy-resolving detectors are compared. Finally, Chapter 5 summarizes various algorithms for spectral CT reconstructions and spectral CT image postprocessing, and links these algorithms to clinical use cases
Author : Scott Hsieh
Publisher : Springer Nature
ISBN 13 : 3031260627
Total Pages : 271 pages
Book Rating : 4.0/5 (312 download)
Download or read book Photon Counting Computed Tomography written by Scott Hsieh and published by Springer Nature. This book was released on 2023-05-27 with total page 271 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book will provide readers with a good overview of some of most recent advances in the field of Photon Counting CT technology for X-ray medical imaging, especially as it pertains to new detectors. There will be a good mixture of general chapters in both technology and applications in CT medical imaging. The book will have an in-depth review of the research topics from world-leading specialists in the field. The conversion of the X-ray signal into analogue/digital value will be covered in some chapters. The authors also provide a review of CMOS chips for X-ray image sensors, methods of material discrimination and image reconstruction techniques. Covers a broad range of topics, including an introduction to novel spectral Computed Tomography; Includes in-depth analysis on how to optimize X-ray detection; Discusses analysis of electronics for X-ray detection.
Author : Zoran Rumboldt
Publisher : Cambridge University Press
ISBN 13 : 1107427479
Total Pages : 143 pages
Book Rating : 4.1/5 (74 download)
Download or read book Clinical Imaging of Spinal Trauma written by Zoran Rumboldt and published by Cambridge University Press. This book was released on 2018-04-05 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt: A concise, case-based clinical resource on the topic of imaging in spinal trauma, highly illustrated throughout.
Author : Andreas Maier
Publisher : Springer
ISBN 13 : 3319965204
Total Pages : 263 pages
Book Rating : 4.3/5 (199 download)
Download or read book Medical Imaging Systems written by Andreas Maier and published by Springer. This book was released on 2018-08-02 with total page 263 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book gives a complete and comprehensive introduction to the fields of medical imaging systems, as designed for a broad range of applications. The authors of the book first explain the foundations of system theory and image processing, before highlighting several modalities in a dedicated chapter. The initial focus is on modalities that are closely related to traditional camera systems such as endoscopy and microscopy. This is followed by more complex image formation processes: magnetic resonance imaging, X-ray projection imaging, computed tomography, X-ray phase-contrast imaging, nuclear imaging, ultrasound, and optical coherence tomography.
Author : Jimish Dilip Joshi
Publisher :
ISBN 13 :
Total Pages : 79 pages
Book Rating : 4.:/5 (773 download)
Download or read book Characterization and Improvement of a Cone-beam CT Scanner for Quantitative Imaging written by Jimish Dilip Joshi and published by . This book was released on 2010 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Hatem Alkadhi
Publisher : Springer Nature
ISBN 13 : 3030962857
Total Pages : 375 pages
Book Rating : 4.0/5 (39 download)
Download or read book Spectral Imaging written by Hatem Alkadhi and published by Springer Nature. This book was released on 2022-05-02 with total page 375 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book, edited by leading experts in radiology, offers a state-of-the-art overview of the specifics and the added value of dual-energy, multi-energy, and spectral computed tomography (CT). Latest advances and upcoming innovations such as photon-counting detector CT are covered by renown experts in the field. The entire spectrum of clinical applications of dual-energy and spectral CT throughout the body is covered. Book chapters are written by expert authors with a background in physics and radiology and are richly illustrated with high quality figures, graphical illustrations, and tables. The first section covers background issues and the most relevant technical aspects of the technique, including a detailed description of the approaches to dual-energy, spectral and photon-counting CT by different vendors of CT scanners. The second part focusses on the use of dual-energy, spectral and photon-counting CT in daily clinical practice, and individual chapters are devoted to imaging of the brain, cardiovascular system, gastrointestinal tract, abdominal organs, skeletal system, and the chest. The focus of the book ensures that it will be of interest for a multidisciplinary forum of readers comprising radiologists, medical physicists, and other medical professionals and scientists being interested in cutting-edge CT imaging.
Author : Katsuyuki Taguchi
Publisher : CRC Press
ISBN 13 : 0429942001
Total Pages : 446 pages
Book Rating : 4.4/5 (299 download)
Download or read book Spectral, Photon Counting Computed Tomography written by Katsuyuki Taguchi and published by CRC Press. This book was released on 2020-07-14 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spectral, Photon Counting Computed Tomography is a comprehensive cover of the latest developments in the most prevalent imaging modality (x-ray computed tomography (CT)) in its latest incarnation: Spectral, Dual-Energy, and Photon Counting CT. Disadvantages of the conventional single-energy technique used by CT technology are that different materials cannot be distinguished and that the noise is larger. To address these problems, a novel spectral CT concept has been proposed. Spectral Dual-Energy CT (DE-CT) acquires two sets of spectral data, and Spectral Photon Counting CT (PC-CT) detects energy of x-ray photons to reveal additional material information of objects by using novel energy-sensitive, photon-counting detectors. The K-edge imaging may be a gateway for functional or molecular CT. The book covers detectors and electronics, image reconstruction methods, image quality assessments, a simulation tool, nanoparticle contrast agents, and clinical applications for spectral CT.
Author : Alexander C. Mamourian
Publisher : Oxford University Press
ISBN 13 : 0199782601
Total Pages : 253 pages
Book Rating : 4.1/5 (997 download)
Download or read book CT Imaging written by Alexander C. Mamourian and published by Oxford University Press. This book was released on 2013-03-14 with total page 253 pages. Available in PDF, EPUB and Kindle. Book excerpt: After reading this book, imagers and CT technologists should better understand the capabilities of modern multidector CT scanners. Imagers and technologists must understand how their scanners operate in order to take advantage of new capabilities for optimizing protocols that minimize patient dose. In addition, the reader will be better prepared to recognize the pitfalls and artifacts that appear on CT imaging. Some of these are unfamiliar to most imagers and are the product of the large detector arrays offered on new CT scanners.
Author : Noriyasu Homma
Publisher : BoD – Books on Demand
ISBN 13 : 9533072342
Total Pages : 304 pages
Book Rating : 4.5/5 (33 download)
Download or read book Theory and Applications of CT Imaging and Analysis written by Noriyasu Homma and published by BoD – Books on Demand. This book was released on 2011-04-04 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: The x-ray computed tomography (CT) is well known as a useful imaging method and thus CT images have continuingly been used for many applications, especially in medical fields. This book discloses recent advances and new ideas in theories and applications for CT imaging and its analysis. The 16 chapters selected in this book cover not only the major topics of CT imaging and analysis in medical fields, but also some advanced applications for forensic and industrial purposes. These chapters propose state-of-the-art approaches and cutting-edge research results.
Author : Kaan Orhan
Publisher : Springer
ISBN 13 : 3030166414
Total Pages : 312 pages
Book Rating : 4.0/5 (31 download)
Download or read book Micro-computed Tomography (micro-CT) in Medicine and Engineering written by Kaan Orhan and published by Springer. This book was released on 2019-07-25 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on applications of micro CT, CBCT and CT in medicine and engineering, comprehensively explaining the basic principles of these techniques in detail, and describing their increasing use in the imaging field. It particularly highlights the scanning procedure, which represents the most crucial step in micro CT, and discusses in detail the reconstruction process and the artifacts related to the scanning processes, as well as the imaging software used in analysis. Written by international experts, the book illustrates the application of micro CT in different areas, such as dentistry, medicine, tissue engineering, aerospace engineering, geology, material engineering, civil engineering and additive manufacturing. Covering different areas of application, the book is of interest not only to specialists in the respective fields, but also to broader audience of professionals working in the fields of imaging and analysis, as well as to students of the different disciplines.
Author : U. Joseph Schoepf
Publisher : Springer Science & Business Media
ISBN 13 : 3642338798
Total Pages : 238 pages
Book Rating : 4.6/5 (423 download)
Download or read book CT Imaging of Myocardial Perfusion and Viability written by U. Joseph Schoepf and published by Springer Science & Business Media. This book was released on 2013-11-22 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent research has identified the assessment of myocardial perfusion and viability as another promising CT application for the comprehensive diagnosis of coronary heart disease. In this book, the first to be devoted to this novel application of CT, leading experts from across the world present up-to-date information and consider future directions. After short sections outlining the state of the art in the traditional applications of CT to image structure and function, the full range of CT techniques that may be employed to evaluate the myocardial blood supply are discussed in detail. Similarly, diverse CT approaches for the assessment of myocardial viability are described, with careful consideration of the available experimental and clinical evidence and the role of quantitative imaging. Protocol recommendations that will be of invaluable practical assistance are also provided.
Author : Jiang Hsieh
Publisher : SPIE Press
ISBN 13 : 9780819444257
Total Pages : 406 pages
Book Rating : 4.4/5 (442 download)
Download or read book Computed Tomography written by Jiang Hsieh and published by SPIE Press. This book was released on 2003 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides an overview of the evolution of CT, the mathematical and physical aspects of the technology, and the fundamentals of image reconstruction using algorithms. Image display is examined from traditional methods through the most recent advancments. Key performance indices, theories behind the measuremet methodologies, and different measurement phantoms in image quality are discussed. The CT scanner is broken down into components to provide the reader with an understanding of their function, their latest advances, and their impact on the CT system. General descriptions and different categories of artifacts, their causes, and their corrections are considered at length.
Author : Mang Feng
Publisher :
ISBN 13 :
Total Pages : 131 pages
Book Rating : 4.:/5 (131 download)
Download or read book Overcoming Spectral Inconsistency-induced Image Artifacts in Photon Counting CT Systems written by Mang Feng and published by . This book was released on 2021 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photon counting detectors (PCDs) use semiconductors such as silicon (Si) or cadmium telluride (CdTe) to directly convert the energy of X-rays to electric (i.e. voltage) pulse signals. The seminconductor sensor and readout electronics of PCDs are fast enough such that the pulses induced by individual X-ray photons can be discriminated and recorded as separate digital counts. Compared with conventional scintillator-based indirect-conversion detectors, the direct conversion mechanism of PCDs can effectively improve spatial resolution. PCDs are equipped with voltage comparators to effectively reject electronic noise and improve images' contrast-to-noise ratio, particularly at low radiation dose levels. By introducing multiple comparators to each detector pixel, the energy of each X-ray photon can be estimated based on the height of the voltage pulse. These attractive features of PCDs offer the potential of further reducing radiation dose and achieving routine spectral imaging in x-ray computed tomography (CT). However, there is a technical challenge in the way of using PCD in clinical CT: the energy response functions of PCDs are inconsistency across different semiconductor panels due to slight variations in the semiconductor impurity level, threshold voltage, and other physical reasons. This spectral inconsistency problem leads to concentric artifacts in reconstructed PCD-CT images that severely degrade low-contrast detectability and material quantification accuracy. This thesis presents two methods to address the spectral inconsistency-induced concentric artifacts in PCD-CT: The first method method leverages the energy-resolving capability of PCDs to perform project-domain material decomposition to decouple the image object's information from the detector response function. The second method does not require a PCD to be operated under the spectral imaging mode; instead, it uses an image-domain segmentation process to help estimating the non-water contents in an image object, based on which detector pixel-specific correction functions were applied to address the nonuniformity in the raw projection data. Both methods were experimentally evaluated on a benchtop PCD-CT system and a prototype C-arm PCD-CT system with human-sized phantoms, human cadavers, and in vivo large animals. The experimental results demonstrated that the spectral inconsistency-induced artifacts in PCD-CT can be effectively addressed with the proposed methods. Finally, this thesis demonstrates examples of how the correction methods can be employed to accomplish high-quality and quantitative virtual non-contrast imaging, virtual monoenergetic imaging, and dual K-edge contrast material PCD-CT imaging.
Author : Dustin Ryan Osborne
Publisher :
ISBN 13 :
Total Pages : 227 pages
Book Rating : 4.:/5 (793 download)
Download or read book Characterization of a Small Animal SPECT Platform for Use in Preclinical Translational Research written by Dustin Ryan Osborne and published by . This book was released on 2011 with total page 227 pages. Available in PDF, EPUB and Kindle. Book excerpt: Imaging Iodine-125 requires an increased focus on developing an understanding of how fundamental processes used by imaging systems work to provide quantitative output for the imaging system. Isotopes like I-125 pose specific imaging problems that are a result of low energy emissions as well as how closely spaced those emissions are in the spectrum. This work seeks to characterize the performance of a small animal SPECT-CT imaging system with respect to imaging I-125 for use in a preclinical translational research environment and to understand how the performance of this system relates to critical applications such as attenuation and scatter correction. The specific aims of this work examined several key areas of system function and performance with respect to I-125 imaging. The first aim examined the geometric SPECT calibration routine used for the Inveon imaging system with a particular focus on determining the accuracy of the calibration as well as the robustness of the algorithm under routine and adverse imaging conditions. The second aim was to characterize detector uniformity issues that may arise by comparing the uniformity performance of the system with both I-125 and Co-57 as well as examining the possibility of altering the acquisition method for normalization scans to increase the uniformity performance. The third aim sought to optimize the energy window used for acquisition of I-125 data and to determine the effects the selection of the window had on valid and scatter events. The fourth aim used the optimized windows, determined by the third aim, to assess the performance of a reconstruction algorithm, currently under development, that corrects for attenuation and scatter effects. The fifth and final aim of this work sought to assess the feasibility acquiring SPECT-CT data simultaneously and to assess the quality of data that could be achieved if simultaneous acquisition of the two imaging modalities was, in fact, possible. This work met these aims by performing an extensive series of studies examining the response of the system to I-125 imaging. These included multiple series of phantom imaging using both manufacturer as well as custom-designed sources for use with measurements involving I-125 and Co-57. Statistics from over 60 datasets with analysis in greater than 480 regions of interest were used for the analysis of attenuation and scatter correction data alone. The final study involving simultaneous SPECT-CT acquisition required modification of the imaging hardware to enable this type of data collection as well as development of a reconstruction algorithm to correctly handle the CT data acquired in a step-and-shoot helical mode. A number of key findings resulted from this work including the validation of the calibration routine of this imaging system, even under non-ideal imaging conditions for both the SPECT and CT modalities. Uniformity performance with I-125 was found to be a challenge with this imaging system but reductions in performance compared to other isotopes were not significant enough to introduce severe artifacts into the image data. Optimization of I-125 parameters resulted in improvements of the processed data indicating that the recommended settings provided by the manufacturer could be altered to provide results that better balance between minimizing scatter effects and maximizing detection of valid events. Assessment of the proposed scatter and attenuation correction algorithm for this system showed marked improvement as compared to data processed without these corrections. The final study of simultaneous SPECT-CT imaging proved this acquisition method to be feasible on a commercial system with minimal The primary conclusions drawn from this study indicate that the system is adequate for imaging with I-125 when care is taken to properly maintain the system as well as keeping sources current and properly centered in the scanner field of view during calibration. The study strongly illustrates the necessity of compensating any data collected using I-125 for attenuation and scatter effects; with some regions showing greater than 25% attenuation and approximately 30% improvement in quantitative values for scatter affected regions with the corrections applied. The study also concludes that simultaneous SPECT-CT is feasible with minor adjustments to a commercial platform.
Author : Indra J. Das
Publisher :
ISBN 13 : 9781936366439
Total Pages : 828 pages
Book Rating : 4.3/5 (664 download)
Download or read book Principles and Practice of Proton Bean Therapy, AAPM Monograph written by Indra J. Das and published by . This book was released on 2015-06-22 with total page 828 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Xiangyang Tang
Publisher : CRC Press
ISBN 13 : 0429650337
Total Pages : 292 pages
Book Rating : 4.4/5 (296 download)
Download or read book Spectral Multi-Detector Computed Tomography (sMDCT) written by Xiangyang Tang and published by CRC Press. This book was released on 2023-12-11 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: X-ray computed tomography (CT) has been one of the most popular diagnostic imaging modalities for decades in the clinic for saving patients’ lives or improving their quality of life. This book is an introductory one-stop shop for technological and clinical topics in multi-detector computed tomography (MDCT). Starting with MDCT’s fundamentals in physics and mathematics, the book provides an in-depth introduction to its system architecture and imaging chain, signal detection via energy-integration and photon-counting mechanisms, clinical application-driven scan modes and protocols, analytic and iterative image reconstruction solutions, and spectral imaging – the latest technological advancement in MDCT. The book extends its coverage on image quality assessment under the theory of signal detection and statistical decision. In recognition of its clinical relevance for conspicuity enhancement in angiographic and parenchymal imaging applications, the book features a chapter dedicated to the fundamental (chemical, physical and physicochemical) properties and clinical administration of iodinated contrast agent. The book ends with an outlook of the contrast agents that are novel in material and delivery, and their synergy with spectral MDCT to elevate CT’s contrast resolution in cardiovascular, neurovascular and oncologic applications. This book will be an invaluable reference for researchers, engineers, radiological physicians and technologists, and graduate and senior undergraduate students. Features Provides an accessible introduction to the subject Up to date with the latest advances in emerging technologies and procedures Provides a historical overview of CT technology Xiangyang Tang, PhD, is an imaging scientist with extensive research and development experience in industry (GE Healthcare), academia (Emory University School of Medicine) and the clinic (Emory Healthcare). With a focus on computed tomography, Tang has been working in the field of medical imaging for more than 20 years. He is a professor of radiology and imaging sciences at Emory University School of Medicine, Fellow of SPIE (International Society for Optics and Photonics) and Fellow of AAPM (American Association of Physicists in Medicine). Along with the publication of more than 200 papers in leading scientific journals and conferences, his contributions to the scientific community include serving as associate editor for a number of prestigious journals, in addition to working on the scientific committees of leading conferences and panels for numerous federal and foundational study sections.
