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Author : Mary Adjeiwaah
Publisher :
ISBN 13 : 9789178551309
Total Pages : pages
Book Rating : 4.5/5 (513 download)
Download or read book Quality Assurance for Magnetic Resonance Imaging (MRI) in Radiotherapy written by Mary Adjeiwaah and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Mary Adjeiwaah
Publisher :
ISBN 13 : 9789176017975
Total Pages : pages
Book Rating : 4.0/5 (179 download)
Download or read book Quality Assurance for Magnetic Resonance Imaging (MRI) in Radiotherapy written by Mary Adjeiwaah and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic resonance imaging (MRI) utilizes the magnetic properties of tissues to generate image-forming signals. MRI has exquisite soft-tissue contrast and since tumors are mainly soft-tissues, it offers improved delineation of the target volume and nearby organs at risk. The proposed Magnetic Resonance-only Radiotherapy (MR-only RT) work flow allows for the use of MRI as the sole imaging modality in the radiotherapy (RT) treatment planning of cancer. There are, however, issues with geometric distortions inherent with MR image acquisition processes. These distortions result from imperfections in the main magnetic field, nonlinear gradients, as well as field disturbances introduced by the imaged object. In this thesis, we quantified the effect of system related and patient-induced susceptibility geometric distortions on dose distributions for prostate as well as head and neck cancers. Methods to mitigate these distortions were also studied. In Study I, mean worst system related residual distortions of 3.19, 2.52 and 2.08 mm at bandwidths (BW) of 122, 244 and 488 Hz/pixel up to a radial distance of 25 cm from a 3T PET/MR scanner was measured with a large field of view (FoV) phantom. Subsequently, we estimated maximum shifts of 5.8, 2.9 and 1.5 mm due to patient-induced susceptibility distortions. VMAT-optimized treatment plans initially performed on distorted CT (dCT) images and recalculated on real CT datasets resulted in a dose difference of less than 0.5%. The magnetic susceptibility differences at tissue-metallic,-air and -bone interfaces result in local B 0 magnetic field inhomogeneities. The distortion shifts caused by these field inhomogeneities can be reduced by shimming. Study II aimed to investigate the use of shimming to improve the homogeneity of local B 0 magnetic field which will be beneficial for radiotherapy applications. A shimming simulation based on spherical harmonics modeling was developed. The spinal cord, an organ at risk is surrounded by bone and in close proximity to the lungs may have high susceptibility differences. In this region, mean pixel shifts caused by local B 0 field inhomogeneities were reduced from 3.47±1.22 mm to 1.35±0.44 mm and 0.99±0.30 mm using first and second order shimming respectively. This was for a bandwidth of 122 Hz/pixel and an in-plane voxel size of 1×1 mm 2 . Also examined in Study II as in Study I was the dosimetric effect of geometric distortions on 21 Head and Neck cancer treatment plans. The dose difference in D 50 at the PTV between distorted CT and real CT plans was less than 1.0%. In conclusion, the effect of MR geometric distortions on dose plans was small. Generally, we found patient-induced susceptibility distortions were larger compared with residual system distortions at all delineated structures except the external contour. This information will be relevant when setting margins for treatment volumes and organs at risk. The current practice of characterizing MR geometric distortions utilizing spatial accuracy phantoms alone may not be enough for an MR-only radiotherapy workflow. Therefore, measures to mitigate patient-induced susceptibility effects in clinical practice such as patient-specific correction algorithms are needed to complement existing distortion reduction methods such as high acquisition bandwidth and shimming.
Author : Günter H. Hartmann
Publisher : Springer Science & Business Media
ISBN 13 : 3642797180
Total Pages : 101 pages
Book Rating : 4.6/5 (427 download)
Download or read book Quality Assurance Program on Stereotactic Radiosurgery written by Günter H. Hartmann and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: Radiosurgery performed with the "Gamma Knife" or on a linac facility is a specific radiotherapy method to treat certain lesions in the brain with a high single radiation dose. Geometric miss of a radiosurgica target is considered the most likely serious error in a stereotactic radiosurgery treatment. Therefore, the issue of quality assurance in stereotactic radiosurgery is a serious one for neurosurgeons, physicists, patients and those of us who wish to analyze the results of radiosurgery. The purpose of this book is to offer and describe a quality assurance program and procedures of the physical and technical aspects through identifying the sources of possible errors and suggesting quality assurance tests that should be performed in order for a stereotactic system to be used clinically.
Author : Ning Wen
Publisher : Frontiers Media SA
ISBN 13 : 288963762X
Total Pages : 170 pages
Book Rating : 4.8/5 (896 download)
Download or read book Magnetic Resonance Imaging for Radiation Therapy written by Ning Wen and published by Frontiers Media SA. This book was released on 2020-06-04 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 168 pages
Book Rating : 4.:/5 ( download)
Download or read book Magnetic Resonance Imaging (MRI) Quality Control Manual written by and published by . This book was released on 2001 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Edward Jackson
Publisher :
ISBN 13 : 9781936366026
Total Pages : pages
Book Rating : 4.3/5 (66 download)
Download or read book Tg 1 - Acceptance Testing and Quality Assurance Procedures for Magnetic Resonance Imaging Facilities written by Edward Jackson and published by . This book was released on 2010-12-01 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : X. Allen Li
Publisher : CRC Press
ISBN 13 : 1439816352
Total Pages : 404 pages
Book Rating : 4.4/5 (398 download)
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
Author : Gary Liney
Publisher : Springer
ISBN 13 : 3030144429
Total Pages : 210 pages
Book Rating : 4.0/5 (31 download)
Download or read book MRI for Radiotherapy written by Gary Liney and published by Springer. This book was released on 2019-06-20 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides, for the first time, a unified approach to the application of MRI in radiotherapy that incorporates both a physics and a clinical perspective. Readers will find detailed information and guidance on the role of MRI in all aspects of treatment, from dose planning, with or without CT, through to response assessment. Extensive coverage is devoted to the latest technological developments and emerging options. These include hybrid MRI treatment systems, such as MRI-Linac and proton-guided systems, which are ushering in an era of real-time MRI guidance. The past decade has witnessed an unprecedented rise in the use of MRI in the radiation treatment of cancer. The development of highly conformal dose delivery techniques has led to a growing need to harness advanced imaging for patient treatment. With its flexible soft tissue contrast and ability to acquire functional information, MRI offers advantages at all stages of treatment. In documenting the state of the art in the field, this book will be of value to a wide range of professionals. The authors are international experts drawn from the scientific committee of the 2017 MR in RT symposium and the faculty of the ESTRO teaching course on imaging for physicists.
Author : Nuclear Magnetic Resonance Committee Task Group No.1
Publisher : American Institute of Physics
ISBN 13 : 9780883188002
Total Pages : 11 pages
Book Rating : 4.1/5 (88 download)
Download or read book Quality Assurance Methods and Phantoms for Magnetic Resonance Imaging written by Nuclear Magnetic Resonance Committee Task Group No.1 and published by American Institute of Physics. This book was released on 1998-03-31 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Gary Liney
Publisher :
ISBN 13 : 9783030144449
Total Pages : 210 pages
Book Rating : 4.1/5 (444 download)
Download or read book MRI for Radiotherapy written by Gary Liney and published by . This book was released on 2019 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides, for the first time, a unified approach to the application of MRI in radiotherapy that incorporates both a physics and a clinical perspective. Readers will find detailed information and guidance on the role of MRI in all aspects of treatment, from dose planning, with or without CT, through to response assessment. Extensive coverage is devoted to the latest technological developments and emerging options. These include hybrid MRI treatment systems, such as MRI-Linac and proton-guided systems, which are ushering in an era of real-time MRI guidance. The past decade has witnessed an unprecedented rise in the use of MRI in the radiation treatment of cancer. The development of highly conformal dose delivery techniques has led to a growing need to harness advanced imaging for patient treatment. With its flexible soft tissue contrast and ability to acquire functional information, MRI offers advantages at all stages of treatment. In documenting the state of the art in the field, this book will be of value to a wide range of professionals. The authors are international experts drawn from the scientific committee of the 2017 MR in RT symposium and the faculty of the ESTRO teaching course on imaging for physicists.
Author : National Council on Radiation Protection and Measurements
Publisher : National Council on Radiation Protection & Measurements
ISBN 13 :
Total Pages : 272 pages
Book Rating : 4.3/5 (91 download)
Download or read book Quality Assurance for Diagnostic Imaging Equipment written by National Council on Radiation Protection and Measurements and published by National Council on Radiation Protection & Measurements. This book was released on 1988 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This report addresses factors that influence production of an image which contains the necessary information to enable the imaging physician to report the diagnostic findings to the referring physician. The report treats such matters as the establishment of a quality control program, procedures, objectives and policies, photographic quality control, quality control in conventional radiography, fluoroscopic and cine imaging and mobile radiographic capacitor discharge and fluoroscopic systems. Also treated are x-ray tomography, mammography, dental radiography, and radiological special procedures. Computed tomography, digital imaging, nuclear medicine, ultrasound and magnetic resonance imaging are also addressed. Information is provided on quality control elements of video systems and computers."--Knovel's description
Author : Elke Hattingen
Publisher : Springer
ISBN 13 : 3642450407
Total Pages : 166 pages
Book Rating : 4.6/5 (424 download)
Download or read book Brain Tumor Imaging written by Elke Hattingen and published by Springer. This book was released on 2015-09-02 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the basics, the challenges and the limitations of state of the art brain tumor imaging and examines in detail its impact on diagnosis and treatment monitoring. It opens with an introduction to the clinically relevant physical principles of brain imaging. Since MR methodology plays a crucial role in brain imaging, the fundamental aspects of MR spectroscopy, MR perfusion and diffusion-weighted MR methods are described, focusing on the specific demands of brain tumor imaging. The potential and the limits of new imaging methodology are carefully addressed and compared to conventional MR imaging. In the main part of the book, the most important imaging criteria for the differential diagnosis of solid and necrotic brain tumors are delineated and illustrated in examples. A closing section is devoted to the use of MR methods for the monitoring of brain tumor therapy. The book is intended for radiologists, neurologists, neurosurgeons, oncologists and other scientists in the biomedical field with an interest in neuro-oncology.
Author : Robert E Watson
Publisher : Elsevier Health Sciences
ISBN 13 : 0323759424
Total Pages : 153 pages
Book Rating : 4.3/5 (237 download)
Download or read book MR Safety, An Issue of Magnetic Resonance Imaging Clinics of North America, E-Book written by Robert E Watson and published by Elsevier Health Sciences. This book was released on 2020-10-23 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: This issue of MRI Clinics of North America focuses on MR Safety and is edited by Dr. Robert E. Watson. Articles will include: Key elements of clinical MRI safety; Standardized approaches to MR safety assessment of patients with implanted devices; Performing MRI safely in patients with implanted electronic devices: cardiac electronic implanted devices and neurostimulators; Implanted devices: SAR considerations for common diagnostic examinations; Testing of commonly implanted devices for MR conditional labelling; MR safety in the 7T environment; Physics of MR safety; MRI safety considerations of gadolinium based contrast agents: gadolinium retention and nephrogenic systemic fibrosis; MRI safety: Siting and zoning considerations; Elements of effective patient screening to improve safety in MRI, including use of ferromagnetic detection systems; MRI safety in the interventional environment; MRI Safety: Pregnancy and Lactation; MR safety: Computer MRI simulations for testing of electronic devices; and more!
Author : George Starkschall
Publisher : Medical Physics Publishing Corporation
ISBN 13 :
Total Pages : 404 pages
Book Rating : 4.3/5 (91 download)
Download or read book Quality Assurance in Radiotherapy Physics written by George Starkschall and published by Medical Physics Publishing Corporation. This book was released on 1991 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : R. James Knowles
Publisher :
ISBN 13 : 9781556420108
Total Pages : 120 pages
Book Rating : 4.4/5 (21 download)
Download or read book Quality Assurance and Image Artifacts in Magnetic Resonance Imaging written by R. James Knowles and published by . This book was released on 1987-12-01 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : William H. Faulkner, Jr.
Publisher : John Wiley & Sons
ISBN 13 : 1119508576
Total Pages : 144 pages
Book Rating : 4.1/5 (195 download)
Download or read book Rad Tech's Guide to MRI written by William H. Faulkner, Jr. and published by John Wiley & Sons. This book was released on 2020-03-09 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second edition of Rad Tech's Guide to MRI provides practicing and training technologists with a succinct overview of magnetic resonance imaging (MRI). Designed for quick reference and examination preparation, this pocket-size guide covers the fundamental principles of electromagnetism, MRI equipment, data acquisition and processing, image quality and artifacts, MR Angiography, Diffusion/Perfusion, and more. Written by an expert practitioner and educator, this handy reference guide: Provides essential MRI knowledge in a single portable, easy-to-read guide Covers instrumentation and MRI hardware components, including gradient and radio-frequency subsystems Provides techniques to handle flow imaging issues and improve the quality of MRIs Explains the essential physics underpinning MRI technology Rad Tech's Guide to MRI is a must-have resource for student radiographers, especially those preparing for the American Registry of Radiation Technologist (ARRT) exams, as well as practicing radiology technologists looking for a quick reference guide.
Author : Alan Jackson
Publisher : Springer Science & Business Media
ISBN 13 : 3540264205
Total Pages : 307 pages
Book Rating : 4.5/5 (42 download)
Download or read book Dynamic Contrast-Enhanced Magnetic Resonance Imaging in Oncology written by Alan Jackson and published by Springer Science & Business Media. This book was released on 2005-11-02 with total page 307 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamic contrast-enhanced MRI is now established as the methodology of choice for the assessment of tumor microcirculation in vivo. The method assists clinical practitioners in the management of patients with solid tumors and is finding prominence in the assessment of tumor treatments, including anti-angiogenics, chemotherapy, and radiotherapy. Here, leading authorities discuss the principles of the methods, their practical implementation, and their application to specific tumor types. The text is an invaluable single-volume reference that covers all the latest developments in contrast-enhanced oncological MRI.
