Download or read book Development of Quality Assurance in Magnetic Resonance Imaging written by Roy John Hughes and published by . This book was released on 1989 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
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:
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:
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:
Download or read book MRI from Picture to Proton written by Donald W. McRobbie and published by Cambridge University Press. This book was released on 2017-04-13 with total page 405 pages. Available in PDF, EPUB and Kindle. Book excerpt: MR is a powerful modality. At its most advanced, it can be used not just to image anatomy and pathology, but to investigate organ function, to probe in vivo chemistry, and even to visualise the brain thinking. However, clinicians, technologists and scientists struggle with the study of the subject. The result is sometimes an obscurity of understanding, or a dilution of scientific truth, resulting in misconceptions. This is why MRI from Picture to Proton has achieved its reputation for practical clarity. MR is introduced as a tool, with coverage starting from the images, equipment and scanning protocols and traced back towards the underlying physics theory. With new content on quantitative MRI, MR safety, multi-band excitation, Dixon imaging, MR elastography and advanced pulse sequences, and with additional supportive materials available on the book's website, this new edition is completely revised and updated to reflect the best use of modern MR technology.
Download or read book Practical Guide to Quality Assurance in Medical Imaging written by B. M. Moores and published by John Wiley & Sons. This book was released on 1987 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a practical guide to the implementation and operation of a routine quality assurance (QA) programme for personnel concerned with the daily provision of diagnostic radiology services. It is written by two physicists and two radiographers with extensive experience in developing and implementing QA protocols. Quality assurance in this context is concerned with the interplay of three related aspects of radiological practice - costs, risks and benefits - with the aim of producing the most effective operational framework for the application of these principles.
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:
Download or read book Development of Quality Standards for Multi center Longitudinal Magnetic Resonance Imaging Studies in Clinical Neuroscience written by Christoph Vogelbacher and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
Download or read book Quality Assurance Management written by Gayathri De Lanerolle and published by Academic Press. This book was released on 2024-07-20 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quality Assurance Management: A Comprehensive Overview of Real-World Applications for High Risk Specialties demonstrates how to best design and implement standard operating procedures (SOPs) to ensure protocol and regulation adherence. The book showcases similarities and differences between healthcare and academic quality assurance systems, resulting in counter-productivity and performance issues, in addition to regulatory inspection preparedness. It uses the processes and standards of the UK to demonstrate how to combine QA and research building into ‘building blocks’ that share a common pathway for effective project design, analysis and unbiased interpretation of collated data.This book fills a gap, providing original research in QA that especially focuses on specialist areas. It will be of use to research and clinical staff working in clinical research within healthcare, academia and industry. Uses practice-based evidence for developing and delivering quality assurance and management systems Includes case studies associated with ‘failures’ and ‘lessons learned’ Discusses clinical trials in academic, clinical and industry settings Demonstrates how to build resilience into systems that could evolve to promote best practices, even with limited resources Compares and contrasts different QA/QC practices
Download or read book The Clinical Development of Prostate Magnetic Resonance Imaging Only Simulation for Radiation Therapy written by Kamal Singhrao and published by . This book was released on 2020 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic resonance imaging-only (MRI-only) simulation for external beam radiation therapy treatment planning of prostate cancer has seen increased clinical use. The use of a single imaging modality for simulation imaging brings benefits to radiation therapy workflows such as the elimination of systematic positional errors associated with multimodal image registration during treatment planning. However, several challenges remain for the widespread clinical adoption of MRI-only simulation imaging for radiation therapy such as the lack of robust pre-treatment alignment methods and dedicated quality assurance testing equipment. In the MRI-only simulation imaging workflow, synthetic computed tomography (CT) images are created for a variety of uses including providing tissue electron density information for dose calculations. Synthetic CT image generation algorithms are typically trained using patient data and are highly sensitive to human tissue contrast and geometry. Most institutions that treat patients with MRI-only simulation images cannot use commercially available phantoms to quality assurance test processes such as synthetic CT image generation. This is because most commercially available phantoms do not mimic human tissue geometry and tissue imaging characteristics for both MRI/CT modalities. The absence of MRI/CT compatible end-to-end quality assurance testing instruments could potentially lead to systematic errors in treatments using MRI-only simulation imaging because of the lack of imaging and dosimetric benchmarking standards. Studies on the commissioning of MRI-only simulation imaging for radiation therapy of prostate cancers have recommended the use of intraprostatic fiducial markers for pre-treatment patient positioning and alignment. However, fiducial markers appear as dark signal voids in MRI and are challenging to manually localize without the aid of CT imaging. Other intraprostatic objects such as calcifications produce similar signal voids to fiducial markers in MRI images. There is currently no consensus on the optimal fiducial marker or MRI sequence to detect fiducial markers with a high level of sensitivity and specificity in MRI-only simulation images. Additionally, there are no clinically available automatic marker detection workflows available to aid in the clinical transition to MRI-only simulation imaging. This thesis presents work undertaken to meet the challenges of the clinical development of MRI-only simulation imaging for radiation therapy of prostate cancers. In the presented work, the author describes the development of a novel system of multimodal tissue mimicking materials for MRI and CT imaging. The aforementioned system of materials was adapted into a novel 3D-printed anthropomorphic phantom for quality assurance testing of MRI-only simulation procedures. To address the issues with patient positioning and alignment, a human and phantom study was conducted to quantitatively evaluate the optimal fiducial marker and MRI sequence for patients receiving MRI-only radiation therapy simulation imaging. Finally, an automatic deep-learning based fiducial marker detection algorithm is presented to aid with the clinical transition of CT-based to MRI-only radiation therapy simulation workflow.
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.
Download or read book Magnetic Resonance Imaging in Tissue Engineering written by Mrignayani Kotecha and published by John Wiley & Sons. This book was released on 2017-03-06 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic Resonance Imaging in Tissue Engineering provides a unique overview of the field of non-invasive MRI assessment of tissue engineering and regenerative medicine Establish a dialogue between the tissue-engineering scientists and imaging experts and serves as a guide for tissue engineers and biomaterial developers alike Provides comprehensive details of magnetic resonance imaging (MRI) techniques used to assess a variety of engineered and regenerating tissues and organs Covers cell-based therapies, engineered cartilage, bone, meniscus, tendon, ligaments, cardiovascular, liver and bladder tissue engineering and regeneration assessed by MRI Includes a chapter on oxygen imaging method that predominantly is used for assessing hypoxia in solid tumors for improving radiation therapy but has the ability to provide information on design strategies and cellular viability in tissue engineering regenerative medicine
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.
Download or read book Quantitative Magnetic Resonance Imaging written by Nicole Seiberlich and published by Academic Press. This book was released on 2020-11-18 with total page 1094 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantitative Magnetic Resonance Imaging is a ‘go-to’ reference for methods and applications of quantitative magnetic resonance imaging, with specific sections on Relaxometry, Perfusion, and Diffusion. Each section will start with an explanation of the basic techniques for mapping the tissue property in question, including a description of the challenges that arise when using these basic approaches. For properties which can be measured in multiple ways, each of these basic methods will be described in separate chapters. Following the basics, a chapter in each section presents more advanced and recently proposed techniques for quantitative tissue property mapping, with a concluding chapter on clinical applications. The reader will learn: The basic physics behind tissue property mapping How to implement basic pulse sequences for the quantitative measurement of tissue properties The strengths and limitations to the basic and more rapid methods for mapping the magnetic relaxation properties T1, T2, and T2* The pros and cons for different approaches to mapping perfusion The methods of Diffusion-weighted imaging and how this approach can be used to generate diffusion tensor maps and more complex representations of diffusion How flow, magneto-electric tissue property, fat fraction, exchange, elastography, and temperature mapping are performed How fast imaging approaches including parallel imaging, compressed sensing, and Magnetic Resonance Fingerprinting can be used to accelerate or improve tissue property mapping schemes How tissue property mapping is used clinically in different organs Structured to cater for MRI researchers and graduate students with a wide variety of backgrounds Explains basic methods for quantitatively measuring tissue properties with MRI - including T1, T2, perfusion, diffusion, fat and iron fraction, elastography, flow, susceptibility - enabling the implementation of pulse sequences to perform measurements Shows the limitations of the techniques and explains the challenges to the clinical adoption of these traditional methods, presenting the latest research in rapid quantitative imaging which has the possibility to tackle these challenges Each section contains a chapter explaining the basics of novel ideas for quantitative mapping, such as compressed sensing and Magnetic Resonance Fingerprinting-based approaches
Download or read book Applications and Experiences of Quality Control written by Ognyan Ivanov and published by BoD – Books on Demand. This book was released on 2011-04-26 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt: The rich palette of topics set out in this book provides a sufficiently broad overview of the developments in the field of quality control. By providing detailed information on various aspects of quality control, this book can serve as a basis for starting interdisciplinary cooperation, which has increasingly become an integral part of scientific and applied research.
