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:
Download or read book Cone Beam Computed Tomography written by Chris C. Shaw and published by Taylor & Francis. This book was released on 2014-02-14 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: Conventional computed tomography (CT) techniques employ a narrow array of x-ray detectors and a fan-shaped x-ray beam to rotate around the patient to produce images of thin sections of the patient. Large sections of the body are covered by moving the patient into the rotating x-ray detector and x-ray source gantry. Cone beam CT is an alternative technique using a large area detector and cone-shaped x-ray beam to produce 3D images of a thick section of the body with one full angle (360 degree or 180 degree plus detector coverage) rotation. It finds applications in situations where bulky, conventional CT systems would interfere with clinical procedures or cannot be integrated with the primary treatments or imaging systems. Cone Beam Computed Tomography explores the past, present, and future state of medical x-ray imaging while explaining how cone beam CT, with its superior spatial resolution and compact configuration, is used in clinical applications and animal research. The book: Supplies a detailed introduction to cone beam CT, covering basic principles and applications as well as advanced techniques Explores state-of-the-art research and future developments while examining the fundamental limitations of the technology Addresses issues related to implementation and system characteristics, including image quality, artifacts, radiation dose, and perception Reviews the historical development of medical x-ray imaging, from conventional CT techniques to volumetric 3D imaging Discusses the major components of cone beam CT: image acquisition, reconstruction, processing, and display A reference work for scientists, engineers, students, and imaging professionals, Cone Beam Computed Tomography provides a solid understanding of the theory and implementation of this revolutionary technology.
Download or read book Computed Tomography written by Ehsan Samei and published by Springer Nature. This book was released on 2019-11-15 with total page 469 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers a comprehensive and topical depiction of advances in CT imaging. CT has become a leading medical imaging modality, thanks to its superb spatial and temporal resolution to depict anatomical details. New advances have further extended the technology to provide physiological information, enabling a wide and expanding range of clinical applications. The text covers the latest advancements in CT technology and clinical applications for a variety of CT types and imaging methods. The content is presented in seven parts to offer a structure across a board coverage of CT: CT Systems, CT Performance, CT Practice, Spectral CT, Quantitative CT, Functional CT, and Special Purpose CT. Each contain chapters written by leading experts in the field, covering CT hardware and software innovations, CT operation, CT performance characterization, functional and quantitative applications, and CT systems devised for specific anatomical applications. This book is an ideal resource for practitioners of CT applications in medicine, including physicians, trainees, engineers, and scientists.
Download or read book Maxillofacial Cone Beam Computed Tomography written by William C. Scarfe and published by Springer. This book was released on 2018-01-04 with total page 1241 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book provides a comprehensive description of the fundamental operational principles, technical details of acquiring and specific clinical applications of dental and maxillofacial cone beam computed tomography (CBCT). It covers all clinical considerations necessary for optimal performance in a dental setting. In addition overall and region specific correlative imaging anatomy of the maxillofacial region is described in detail with emphasis on relevant disease. Finally imaging interpretation of CBCT images is presented related to specific clinical applications. This book is the definitive resource for all who refer, perform, interpret or use dental and maxillofacial CBCT including dental clinicians and specialists, radiographers, ENT physicians, head and neck, and oral and maxillofacial radiologists.
Download or read book Implementation and Characterization of Cone Beam Computed Tomography Using a Cobalt 60 Gamma Ray Source for Radiation Therapy Patient Localization written by Nicholas Jeffrey Rawluk and published by . This book was released on 2010 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cobalt 60 (Co-60) radiation therapy is a simple and reliable method of treating cancer by irradiating treatment volumes within the patient with high energy gamma rays. Medical linear accelerators (linacs) began to replace Co-60 units during the 1960's in more developed countries, but Co 60 has remained the main source of radiotherapy treatment in less developed countries around the world. As a result, technological advancements made in more developed countries to deliver more precise radiation treatment that improves patient outcome have not been clinically applied to Co-60 machines. The medical physics group at the Cancer Centre of Southeastern Ontario has shown that these same technological advancements can be applied to Co-60 machines which would increase the accessibility of these modern improvements in radiotherapy treatment. However, for these modern treatments to improve patient outcome they require more precise localization of the patient prior to therapy. In more developed countries, this is currently provided by comparing computed tomography (CT) used for treatment planning with images acquired on the linac immediately before treatment. In the past decade, cone-beam CT (CBCT) has been developed to provide 3D CT images of the patient immediately prior to treatment on a linac. This imaging modality would also be ideal for patient localization when conducting modern Co-60 treatments since it would only require the addition of an imaging panel to produce CBCT images using the Co-60 source. A prototype Co-60 CBCT imaging system was implemented and characterized. Image noise, contrast, spatial resolution, and artifacts were studied. Algorithms to reduce the image artifacts were implemented and found to improve perceived image quality. The imaging system was found to have a ~1.8 mm high-contrast spatial resolution and the ability to detect 3 cm low-contrast soft-tissue structures in water. Anthropomorphic phantoms were also imaged and the observed anatomy in Co-60 CBCT images was comparable to kilovoltage CT. These results are comparable to clinically relevant linac-based CBCT using high energy X rays of similar energies to Co-60 gamma rays. This suggests that Co-60 CBCT should be able to provide the necessary images to localize patients for modern Co-60 radiation treatments.
Download or read book Medical Imaging and Augmented Reality written by Hongen Liao and published by Springer Science & Business Media. This book was released on 2010-09 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the 5th International Workshop on Medical Imaging and Augmented Reality, MIAR 2010, held in Beijing, China, in September 2010. The 60 revised full papers presented were carefully reviewed and selected from 139 submissions. The papers are organized in topical sections on image segmentation, image registration, shape modeling and morphometry, image analysis, diffusion tensor image, computer assisted intervention, medical image computing, visualization and application, segmentation and classification, medical image understanding, image-guided surgery, and augmented reality.
Download or read book Computed Tomography written by Thorsten M. Buzug and published by Springer Science & Business Media. This book was released on 2008-05-20 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides an overview of X-ray technology and the historical development of modern CT systems. The main focus of the book is a detailed derivation of reconstruction algorithms in 2D and modern 3D cone-beam systems. A thorough analysis of CT artifacts and a discussion of practical issues such as dose considerations give further insight into current CT systems. Although written mainly for graduate students, practitioners will also benefit from this book.
Download or read book Construction and Evaluation of Differential Phase contrast Cone Beam CT Imaging System written by Jiangkun Liu and published by . This book was released on 2015 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: "When X-rays travel through an object, both the intensity and phase status are varied. The amount of variation depends on the attenuation coefficients and phase coefficients of the materials that the object consists of. In recent years, cone beam breast computed tomography (CBBCT) has emerged as a cutting-edge X-ray imaging modality by reconstructing the attenuation contrast. It is an effective method for screening and diagnosis for breast cancer by providing isotropic three-dimensional images with high resolution and high contrast-to-noise ratio (CNR). However, because the variation of attenuation coefficients among soft tissues is subtle, CBBCT is limited in further characterizing breast lesions. Phase contrast CT technology has been attracting research interests recently. It provides new insight into an object by imaging the phase coefficient, which is more sensitive than the attenuation coefficient. Therefore, it has the potential to overcome the limitations of CBBCT and deliver complementary information. Several phase contrast imaging methods have been developed in the past years. However, the requirement of a coherent X-ray source with a sufficiently small dimension impairs their application as a standard method in hospital-based medical imaging. In this thesis, a grating-based bench-top differential phase contrast cone beam CT (DPC-CBCT) system was designed and constructed. Based on the attenuation-based CBCT imaging system setup, it deploys three more major components: a source grating, a phase grating and an analyzer grating. The source grating enables the system to use a hospital-grade X-ray tube and together they provide sufficient X-ray output power and spatial coherence. The phase grating and the analyzer grating transform the phase shift into intensity contrast based on Talbot interferometry so that a high-resolution detector is not necessary. One of the major challenges of the system construction is grating fabrication because of their high aspect ratio and high precision requirements. This work presents designs for robust recipes that produced gratings meeting our demanding criteria. Another challenge is that the system requires highly precise grating alignment to produce the best contrast effect. An effective method is presented in this work that aligns the phase grating the analyzer grating precisely. The second part of this thesis is to evaluate our DPC-CBCT imaging system in terms of uniformity, CNR, noise property and contrast resolution using a cylinder phantom. As the field of view of the imaging system is limited due to the current grating fabrication technique, it is necessary to investigate the performance of volume of interest (VOI) imaging. The VOI imaging experiment was carried out by scanning a large cylinder phantom. In order to evaluate the performance of DPC-CBCT on actual soft tissues, human breast specimen and small animal experiments were carried out. Phantom experiment results indicate that, compared with attenuation imaging, phase contrast imaging provides higher CNR and contrast resolution. However, in specimen and small animal experiments, phase contrast image quality was greatly degraded. The coherence property of an X-ray beam is critical in phase contrast imaging because the image formation mechanism is based on X-ray beam diffraction. Inhomogeneous objects, such as bones and soft tissues, have a large amount of internal density fluctuations or small structures on a micrometer scale. These small structures produce strong small-angle scattering and greatly reduce the coherence of X-ray beams reaching the detector. In order to evaluate the coherence loss caused by an object quantitatively, the last part of this thesis introduces dark-field imaging, which forms an image by computing small-angle scattering power. Dark-field imaging is also based on grating interferometry and the data can be obtained from the same scan with phase contrast imaging. It can be used to characterize the distribution of micro-structures and to investigate coherence loss in DPC-CBCT imaging. Besides coherence loss, several other factors affect the performance of DPC-CBCT, such as polychromatic X-ray spectrum and imperfect gratings. We believe that phase contrast imaging has the potential to be a more powerful imaging tool and more work will be dedicated to the improvement of DPC-CBCT"--Pages vi-viii.
Download or read book Cone Beam CT and 3D imaging written by Pietro Caruso and published by Springer Science & Business Media. This book was released on 2013-09-24 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cone beam computed tomography (CBCT) has become the standard of reference in dental imaging. The distribution of CBCT devices is increasingly wide, and the number of required examinations is constantly growing. In this setting, it is now essential that medical and technical staff receive specific training in the use of CBCT and that technical guidelines for CBCT examinations are established. This clearly structured book on CBCT will be an ideal aid in daily clinical practice. It clearly explains basic CBCT anatomy, examination technique, and the use of 3D reformatting software. A wide range of cases are presented, covering the most frequent and relevant conditions and pathologies, including dental anomalies, inflammatory and degenerative disease, tumors, and implants.
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.
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.
Download or read book Cone Beam Computed Tomography in Orthodontics written by Sunil D. Kapila and published by John Wiley & Sons. This book was released on 2014-08-29 with total page 880 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since its introduction to dentistry, cone beam computed tomography (CBCT) has undergone a rapid evolution and considerable integration into orthodontics. However, despite the increasing popularity of CBCT and progress in applying it to clinical orthodontics, the profession has lacked a cohesive, comprehensive and objective reference that provides clinicians with the background needed to utilize this technology optimally for treating their patients. Cone Beam Computed Tomography in Orthodontics provides timely, impartial, and state-of-the-art information on the indications and protocols for CBCT imaging in orthodontics, clinical insights gained from these images, and innovations driven by these insights. As such, it is the most current and authoritative textbook on CBCT in orthodontics. Cone Beam Computed Tomography in Orthodontics is organized to progress sequentially through specific topics so as to build the knowledgebase logically in this important and rapidly evolving field. Part I provides the foundational information on CBCT technology, including radiation exposure and risks, and future evolutions in computed tomography. Part II presents the Principles and Protocols for CBCT Imaging in Orthodontics, focusing on developing evidence-based criteria for CBCT imaging, the medico-legal implications of CBCT to the professional and the protocols and integration of this technology in orthodontic practice. Part III provides critical information on CBCT-based Diagnosis and Treatment Planning that includes how to interpret CBCT scans, identify incidental pathologies and the possible other uses of this technology. Part IV covers practical aspects of CBCT’s Clinical Applications and Treatment Outcomes that encompasses a range of topics, including root morphology and position, treatment of impacted teeth, virtual surgical treatment planning and outcomes, and more.
Download or read book Cone Beam Computed Tomography written by Jose Ricardo Betancourt Benitez and published by . This book was released on 2010 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computed Tomography written by Ahmet Mesrur Halefoğlu and published by BoD – Books on Demand. This book was released on 2017-08-09 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: The advent and rapid diffusion of advanced multidetector-row scanner technology offers comprehensive evaluation of different anatomic structures in daily practice. The aim of this book is to introduce the applications of CT imaging in not only general medicine but also in different fields especially in veterinary medicine, dentistry, and engineering. Recent developments in CT technology have led to a widening of its applications on many areas like material testing in engineering, 3D evaluation of teeth, and the vascular and cardiac evaluations of small animals.
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.
Download or read book Computed Tomography written by Luca Saba and published by BoD – Books on Demand. This book was released on 2012-01-05 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computed Tomography (CT), and in particular multi-detector-row computed tomography (MDCT), is a powerful non-invasive imaging tool with a number of advantages over the others non- invasive imaging techniques. CT has evolved into an indispensable imaging method in clinical routine. It was the first method to non-invasively acquire images of the inside of the human body that were not biased by superimposition of distinct anatomical structures. The first generation of CT scanners developed in the 1970s and numerous innovations have improved the utility and application field of the CT, such as the introduction of helical systems that allowed the development of the "volumetric CT" concept. In this book we want to explore the applications of CT from medical imaging to other fields like physics, archeology and computer aided diagnosis. Recently interesting technical, anthropomorphic, forensic and archeological as well as paleontological applications of computed tomography have been developed. These applications further strengthen the method as a generic diagnostic tool for non- destructive material testing and three-dimensional visualization beyond its medical use.
Download or read book CT Scanning written by Karupppasamy Subburaj and published by BoD – Books on Demand. This book was released on 2011-10-03 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since its introduction in 1972, X-ray computed tomography (CT) has evolved into an essential diagnostic imaging tool for a continually increasing variety of clinical applications. The goal of this book was not simply to summarize currently available CT imaging techniques but also to provide clinical perspectives, advances in hybrid technologies, new applications other than medicine and an outlook on future developments. Major experts in this growing field contributed to this book, which is geared to radiologists, orthopedic surgeons, engineers, and clinical and basic researchers. We believe that CT scanning is an effective and essential tools in treatment planning, basic understanding of physiology, and and tackling the ever-increasing challenge of diagnosis in our society.
