Development And Optimisation Of Radial Techniques For Sodium Magnetic Resonance Imaging
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Development And Optimisation Of Radial Techniques For Sodium Magnetic Resonance Imaging
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Author : Sònia Nielles-Vallespin
language : en
Publisher:
Release Date : 2004
Development And Optimisation Of Radial Techniques For Sodium Magnetic Resonance Imaging written by Sònia Nielles-Vallespin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
Development And Optimisation Of Radial Techniques For Sodium Magnetic Resonance Imaging
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Author :
language : en
Publisher:
Release Date : 2004
Development And Optimisation Of Radial Techniques For Sodium Magnetic Resonance Imaging written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
The goal of this work was to provide techniques and hardware for 23Na MRI of the human brain, heart and muscle in a clinical scanner at 1.5T. For this purpose, radiofrequency (RF) coils were developed and a transmit/receive switch was adapted to 16.84 MHz. A 3D radial gradient echo (GRE) sequence was implemented, with a minimum echo time TEmin = 0.07ms for 1H and 0.2ms for 23Na, allowing to detect both the short (T2= 0.5ms) and the long (T2= 12-25ms) components of the 23Na NMR signal for total 23Na content evaluation. A gridding reconstruction algorithm with a Kaiser-Bessel window and a rho filter was implemented and optimised for both 23Na and 1H MRI. At an acquisition time Tacq= 10min and a nominal resolution Dx= 4mm, the signal-to-noise ratio SNR of the in-vivo 23Na 3D radial images was twofold higher than in standard cartesian GRE MRI (TEmin= 2ms). In the radial images blurring due to T2 signal decay during data acquisition was observed, reducing the resolution by approximately a factor of two. Both cartesian and radial GRE methods were compared at 1.5T and 4T. An SNR increase of SNR(4T)/SNR(1.5T) ~4 was measured in-vivo. In brain tumour patients, a 20% 23Na MRI signal increase in the tumour region was detected. A contrast-to-noise ratio CNR = 23% between healthy tissue and tumour achieved with the 3D radial was 20% higher than the CNR of the cartesian sequence. In patients with a 23Na channel disfunction, a 23Na MRI signal increase of ~10% was measured. This method allows for the detection of changes in the intracellular 23Na concentration and may provide a new tool to non-invasively evaluate tissue vitality.
Magnetic Resonance Imaging Of The Skeletal Musculature
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Author : Marc-André Weber
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-12-16
Magnetic Resonance Imaging Of The Skeletal Musculature written by Marc-André Weber and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-12-16 with Medical categories.
In the past, MRI has often been assigned a subsidiary role in the diagnostic work-up of muscular diseases owing to the frequent inability of routine MRI protocols to detect pathognomonic findings. This situation is changing with the advent of modern MR imaging techniques that offer deeper insights into various surrogate pathophysiologic parameters. In this book, recognized experts from around the world provide a comprehensive overview of the value of cutting-edge MRI for the assessment of normal and diseased skeletal muscle. A range of aspects are covered, from the general role of MRI in imaging the skeletal musculature, including in comparison with ultrasonography, through to the current value of MRI in the diagnostic work-up of different diseases. In addition, several chapters present research findings in respect of modern morphological and functional MRI techniques and provide examples of the added value provided by these techniques when evaluating muscular diseases.
New Challenges And Future Perspectives In Brain Imaging Methods 2nd Edition
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Author : Nico Sollmann
language : en
Publisher: Frontiers Media SA
Release Date : 2024-10-22
New Challenges And Future Perspectives In Brain Imaging Methods 2nd Edition written by Nico Sollmann and has been published by Frontiers Media SA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-10-22 with Science categories.
Brain imaging has seen considerable advances over the recent years. Both developments and validation of advanced image acquisition techniques as well as post-processing and analyses pipelines contribute to contemporary imaging, including parallel imaging, (semi-)automated segmentation, generation of synthetic images, and application of machine learning and radiomics. Multi-modal approaches using structural, metabolic, and functional imaging are emerging to build a framework for a better understanding of anatomical features and physiological processes of the brain. This Research Topic intends to cover a broad theme, welcoming contributions spanning across the fields of (neuro)radiology, medical image analysis including machine learning, neurosurgery, and neurology, to reflect latest advances in the field of brain imaging. Original research, systematic / narrative / mini review, methods, perspective, clinical trial, case report, brief research report, general commentary, opinion, and technology and code manuscripts are welcome. A special focus is set on the following topics: - Multi-modal imaging (e.g., combination of structural, metabolic, molecular and functional imaging) - Utility of neuronavigation / virtual reality based on imaging data - Application of machine learning, artificial intelligence, and radiomics - Development of (semi-)automated image processing pipelines (e.g., segmentation algorithms) - Image acquisition acceleration / parallel imaging - Translational efforts that describe the transfer of advanced imaging approaches to the clinical setup and/or to a broader application in research - Emerging technology (e.g., mobile bedside MRI, functional ultrasound, magnetic particle imaging)
Biomedical Index To Phs Supported Research
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Author :
language : en
Publisher:
Release Date : 1995
Biomedical Index To Phs Supported Research written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Medicine categories.
Image Principles Neck And The Brain
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Author : Luca Saba
language : en
Publisher: CRC Press
Release Date : 2016-04-21
Image Principles Neck And The Brain written by Luca Saba and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-04-21 with Medical categories.
Magnetic resonance imaging (MRI) is a technique used in biomedical imaging and radiology to visualize internal structures of the body. Because MRI provides excellent contrast between different soft tissues, the technique is especially useful for diagnostic imaging of the brain, muscles, and heart.In the past 20 years, MRI technology has improved si
Deutsche Nationalbibliographie Und Bibliographie Der Im Ausland Erschienenen Deutschsprachigen Ver Ffentlichungen
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Author :
language : de
Publisher:
Release Date : 2005
Deutsche Nationalbibliographie Und Bibliographie Der Im Ausland Erschienenen Deutschsprachigen Ver Ffentlichungen written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Dissertations, Academic categories.
Tid
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Author :
language : en
Publisher:
Release Date : 1968
Tid written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1968 with Energy development categories.
Index To Theses With Abstracts Accepted For Higher Degrees By The Universities Of Great Britain And Ireland And The Council For National Academic Awards
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Author :
language : en
Publisher:
Release Date : 2008
Index To Theses With Abstracts Accepted For Higher Degrees By The Universities Of Great Britain And Ireland And The Council For National Academic Awards written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Dissertations, Academic categories.
Theses on any subject submitted by the academic libraries in the UK and Ireland.
Mri Of Short And Ultrashort T2 Tissues
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Author : Jiang Du
language : en
Publisher: Springer Nature
Release Date : 2024-02-21
Mri Of Short And Ultrashort T2 Tissues written by Jiang Du and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-02-21 with Medical categories.
This book comprehensively covers ultrashort echo time (UTE), zero echo time (ZTE), and other magnetic resonance imaging (MRI) acquisition techniques for imaging of short and ultrashort-T2 tissues. MRI uses a large magnet and radio waves to generate images of tissues in the body. The MRI signal is characterized by two time constants, spin-lattice relaxation time (T1) which describes how fast the longitudinal magnetization recovers to its initial value after tipping to the transverse plane, and spin-spin relaxation time (T2) which describes how fast the transverse magnetization decays. Conventional MRI techniques have been developed to image and quantify tissues with relatively long T2s. However, the body also contains many tissues and tissue components such as cortical bone, menisci, ligaments, tendons, the osteochondral junction, calcified tissues, lung parenchyma, iron containing tissues, and myelin, which have short or ultrashort-T2s. These tissues are “invisible” with conventional MRI, and their MR and tissue properties are not measurable. UTE and ZTE type sequences resolve these challenges and make these tissues visible and quantifiable. This book first introduces the basic physics of conventional MRI as well as UTE and ZTE type MRI, including radiofrequency excitation, data acquisition, and image reconstruction. A series of contrast mechanisms are then introduced and these provide high resolution, high contrast imaging of short and ultrashort-T2 tissues. A series of quantitative UTE imaging techniques are described for measurement of MR tissue properties (proton density, T1, T2, T2*, T1p,magnetization transfer, susceptibility, perfusion and diffusion). Finally, clinical applications in the musculoskeletal, neurological, pulmonary and cardiovascular systems are described. This is an ideal guide for physicists and radiologists interested in learning more about the use of UTE and ZTE type techniques for MRI of short and ultrashort-T2 tissues.