Download or read book Optimization of Cone Beam CT Imaging in the Head Neck and Pelvic Regions written by Michaela Lang and published by . This book was released on 2020 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of an imaging modality, such as cone beam computed tomography (CBCT) for verification and target location immediately prior to a radiotherapy fraction, is essential in modern radiotherapy.Image-guided radiotherapy (IGRT) enables assessment and control of uncertainties in patient positioning, reveals internal organ motion and deformation, and paves the way towards adaptive radiotherapy (ART). However, using CBCT images as an imaging modality leads to an additional radiation dose burden for patients.The aim of this master thesis was to optimize CBCT acquisition and reconstruction protocols with regard to image quality and dose for treatments in the head and neck and pelvic regions, and to analyze the trend of specific imaging parameters. A second goal was to check long-term stability of the radiation output of a selected imaging protocol.If the image quality is optimized, the visualization of anatomical details and the accuracy of the image guidance can be improved. Nevertheless, it is very challenging to find a compromise between better image quality and lower dose for the patients. An improvement in image quality usually results in higher exposure and much longer acquisition and reconstruction time of the image data, which is not beneficial for the patients.By using an F1 filter in the head and neck regions, the dose burden for patients can be reduced by approximately 40 % (average value of two LINACs). The image quality is also slightly improved by the exchanged filter, as a slightly higher SNR could be determined, which is desirable. Therefore, an implementation of an imaging protocol with this filter into clinical routine should be considered.In the pelvic regions, a dose reduction can be achieved by increasing the gantry speed when taking CBCT images. Although the results showed a slightly lower image quality, the faster rotation of the gantry provides better patient comfort, as the time on the treatment table can be reduced by almost one minute. Patient
Download or read book Adaptive Radiation Therapy written by X. Allen Li and published by CRC Press. This book was released on 2011-01-27 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern medical imaging and radiation therapy technologies are so complex and computer driven that it is difficult for physicians and technologists to know exactly what is happening at the point-of-care. Medical physicists responsible for filling this gap in knowledge must stay abreast of the latest advances at the intersection of medical imaging an
Download or read book Atlas of Cone Beam Computed Tomography written by Yaser Safi and published by John Wiley & Sons. This book was released on 2022-02-14 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive collection of oral and maxillofacial cases using cone beam CT imaging Atlas of Cone Beam Computed Tomography delivers a robust collection of cases using this advanced method of imaging for oral and maxillofacial radiology. The book features over 1,500 high-quality CBCT scans with succinct descriptions covering a wide range of maxillofacial region conditions, including normal anatomy, anomalies, inflammatory diseases, and degenerative diseases. Easy to navigate and featuring multiple images of normal variation and pathologies, the book offers readers guidance on the diagnostic values of CBCT, as well as CBCT images of the inferior alveolar nerve canal, dental implants, temporomandibular joint evaluations, and surgical interventions. The book also includes: A thorough introduction to cone beam computed tomography, including in vivo and in vitro preparation and evaluation, indications in dentistry, and indications in medicine Comprehensive explorations of cone beam computed tomography artefacts and anatomic landmarks Practical discussions of cone beam computed tomography of dental structure, including normal anatomy, anomalies, and the difficulties of eruption In-depth examinations of cone beam computed tomography of pathological growth and development, including maxillofacial congenital and developmental anomalies Perfect for graduate dental students and postgraduate dental students in oral and maxillofacial radiology, Atlas of Cone Beam Computed Tomography is also useful to general dentists, oral and maxillofacial radiologists, head and neck maxillofacial surgeons, head and neck radiologists, general radiologists, and ENT surgeons.
Download or read book Cone Beam CT of the Head and Neck written by Chung H. Kau and published by Springer Science & Business Media. This book was released on 2010-11-19 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: 'Cone Beam CT of the Head and Neck' presents normal anatomy of the head using photographs of cadavers and CBCT images in sagittal, axial and coronal planes with the anatomic structures and landmarks clearly labelled. Important structures and regions are presented in detailed view. The photographs of human tissue (based on slicing of cadaveric heads) combined with CBCT images have not been used previously for an atlas of anatomy. Scanned objects with the possibility of 3D reconstruction present better understanding of the anatomy.
Download or read book High precision Cone beam CT Guidance of Head and Neck Surgery written by Nathaniel Hamming and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation and Applications of Optimization based Image Reconstruction in Full and Reduced view Cone beam Computed Tomography written by Xiao Han and published by . This book was released on 2013 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: X-ray computed tomography (CT), since its advent, has become an important clinical imaging tool for providing three-dimensional information of the internal structure of imaged subjects. In recent years, cone-beam CT (CBCT), an emerging technology based upon CT, has experienced remarkable growth and is quickly entering the clinical environment. It has enabled a wide range of applications for fulfilling clinical and pre-clinical needs particularly in image-guided radiation therapy (IGRT), image-guided surgery (IGS), and micro-CT imaging.
Download or read book Optimizing Cone Beam Computed Tomography CBCT System for Image Guided Radiation Therapy written by Chun Joo Park and published by . This book was released on 2013 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cone Beam Computed Tomography (CBCT) system is the most widely used imaging device in image guided radiation therapy (IGRT), where set of 3D volumetric image of patient can be reconstructed to identify and correct position setup errors prior to the radiation treatment. This CBCT system can significantly improve precision of on-line setup errors of patient position and tumor target localization prior to the treatment. However, there are still a number of issues that needs to be investigated with CBCT system such as 1) progressively increasing defective pixels in imaging detectors by its frequent usage, 2) hazardous radiation exposure to patients during the CBCT imaging, 3) degradation of image quality due to patients' respiratory motion when CBCT is acquired and 4) unknown knowledge of certain anatomical features such as liver, due to lack of soft-tissue contrast which makes tumor motion verification challenging. In this dissertation, we explore on optimizing the use of cone beam computed tomography (CBCT) system under such circumstances. We begin by introducing general concept of IGRT. We then present the development of automated defective pixel detection algorithm for X-ray imagers that is used for CBCT imaging using wavelet analysis. We next investigate on developing fast and efficient low-dose volumetric reconstruction techniques which includes 1) fast digital tomosynthesis reconstruction using general-purpose graphics processing unit (GPGPU) programming and 2) fast low-dose CBCT image reconstruction based on the Gradient-Projection-Barzilai-Borwein formulation (GP-BB). We further developed two efficient approaches that could reduce the degradation of CBCT images from respiratory motion. First, we propose reconstructing four dimensional (4D) CBCT and DTS using respiratory signal extracted from fiducial markers implanted in liver. Second, novel motion-map constrained image reconstruction (MCIR) is proposed that allows reconstruction of high quality and high phase resolution 4DCBCT images with no more than the imaging dose used in a standard Free Breathing 3DCBCT (FB-3DCBCT) scan. Finally, we demonstrate a method to analyze motion characteristics of liver that are particularly important for image guided stereotactic body radiation therapy (IG-SBRT). It is anticipated that all the approaches proposed in this study, which are both technically and clinically feasible, will allow much improvement in IGRT process.
Download or read book High precision Cone beam CT Guidance of Head and Neck Surgery written by Nathaniel M. Hamming and published by . This book was released on 2009 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern image-guided surgery aids minimally-invasive, high-precision procedures that increase efficacy of treatment. This thesis investigates two research aims to improve precision and integration of intraoperative cone-beam CT (CBCT) imaging in guidance of head and neck (H&N) surgery. First, marker configurations were examined to identify arrangements that minimize target registration error (TRE). Best arrangements minimized the distance between the configuration centroid and surgical target while maximizing marker separation. Configurations of few markers could minimized TRE with more markers providing improved uniformity. Second, an algorithm for automatic registration of image and world reference frames was pursued to streamline integration of CBCT with real-time tracking and provide automatic updates per scan. Markers visible to the tracking and imaging systems are automatically co-localized and registered with equivalent accuracy and superior reproducibility compared to conventional registration. Such work helps the implementation of CBCT in H&N surgery to maximize surgical precision and exploit intraoperative image guidance.
Download or read book The Handbook of Medical Image Perception and Techniques written by Ehsan Samei and published by Cambridge University Press. This book was released on 2018-12-13 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt: A state-of-the-art review of key topics in medical image perception science and practice, including associated techniques, illustrations and examples. This second edition contains extensive updates and substantial new content. Written by key figures in the field, it covers a wide range of topics including signal detection, image interpretation and advanced image analysis (e.g. deep learning) techniques for interpretive and computational perception. It provides an overview of the key techniques of medical image perception and observer performance research, and includes examples and applications across clinical disciplines including radiology, pathology and oncology. A final chapter discusses the future prospects of medical image perception and assesses upcoming challenges and possibilities, enabling readers to identify new areas for research. Written for both newcomers to the field and experienced researchers and clinicians, this book provides a comprehensive reference for those interested in medical image perception as means to advance knowledge and improve human health.
Download or read book Total marrow irradiation written by Susanta Kumar Hui and published by Frontiers Media SA. This book was released on 2023-07-26 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comprehensive Biomedical Physics written by and published by Newnes. This book was released on 2014-07-25 with total page 4052 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive Biomedical Physics, Ten Volume Set is a new reference work that provides the first point of entry to the literature for all scientists interested in biomedical physics. It is of particularly use for graduate and postgraduate students in the areas of medical biophysics. This Work is indispensable to all serious readers in this interdisciplinary area where physics is applied in medicine and biology. Written by leading scientists who have evaluated and summarized the most important methods, principles, technologies and data within the field, Comprehensive Biomedical Physics is a vital addition to the reference libraries of those working within the areas of medical imaging, radiation sources, detectors, biology, safety and therapy, physiology, and pharmacology as well as in the treatment of different clinical conditions and bioinformatics. This Work will be valuable to students working in all aspect of medical biophysics, including medical imaging and biomedical radiation science and therapy, physiology, pharmacology and treatment of clinical conditions and bioinformatics. The most comprehensive work on biomedical physics ever published Covers one of the fastest growing areas in the physical sciences, including interdisciplinary areas ranging from advanced nuclear physics and quantum mechanics through mathematics to molecular biology and medicine Contains 1800 illustrations, all in full color
Download or read book Contemporary Oral Medicine written by Camile S. Farah and published by Springer. This book was released on 2019-03-07 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book, written by world authorities in the field, is a comprehensive, up-to-date guide to the specialty of Oral Medicine, which is concerned with the diagnosis, prevention, and predominantly non-surgical management of medically related disorders and conditions affecting the oral and maxillofacial region. The pathophysiology, clinical presentation, diagnostic evaluation, and treatment of all relevant diseases and disorders are described with the aid of a wealth of clinical cases and illustrations that enable the reader to appreciate the diversity and potential complexity of Oral Medicine. In addition to the wide-ranging coverage of oral conditions, separate sections are devoted to bone and cutaneous pathology and to orofacial pain and its management, in addition to dental sleep medicine. The clinician who treats Oral Medicine patients will find this book to be an excellent aid to optimal management grounded in a sound knowledge of basic science and the dental and medical aspects of each disorder. In addition, it will serve as an outstanding textbook for undergraduate and postgraduate students.
Download or read book Perez and Brady s Principles and Practice of Radiation Oncology written by Edward C. Halperin and published by Lippincott Williams & Wilkins. This book was released on 2008 with total page 2152 pages. Available in PDF, EPUB and Kindle. Book excerpt: The thoroughly updated fifth edition of this landmark work has been extensively revised to better represent the rapidly changing field of radiation oncology and to provide an understanding of the many aspects of radiation oncology. This edition places greater emphasis on use of radiation treatment in palliative and supportive care as well as therapy.
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 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 Clinical 3D Dosimetry in Modern Radiation Therapy written by Ben Mijnheer and published by CRC Press. This book was released on 2017-10-31 with total page 845 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a first comprehensive summary of the basic principles, instrumentation, methods, and clinical applications of three-dimensional dosimetry in modern radiation therapy treatment. The presentation reflects the major growth in the field as a result of the widespread use of more sophisticated radiotherapy approaches such as intensity-modulated radiation therapy and proton therapy, which require new 3D dosimetric techniques to determine very accurately the dose distribution. It is intended as an essential guide for those involved in the design and implementation of new treatment technology and its application in advanced radiation therapy, and will enable these readers to select the most suitable equipment and methods for their application. Chapters include numerical data, examples, and case studies.
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.
