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Author : Jennifer A. McNab
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (678 download)
Download or read book High Resolution Diffusion-weighted Magnetic Resonance Imaging written by Jennifer A. McNab and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Chunlei Liu
Publisher :
ISBN 13 :
Total Pages : 364 pages
Book Rating : 4.:/5 (794 download)
Download or read book Generalized Diffusion Tensor Magnetic Resonance Imaging and High Resolution Diffusion Weighted Imaging written by Chunlei Liu and published by . This book was released on 2005 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Emine Ülkü Sarıtaş
Publisher : Stanford University
ISBN 13 :
Total Pages : 131 pages
Book Rating : 4.F/5 ( download)
Download or read book High-resolution Diffusion MRI of Targeted Regions written by Emine Ülkü Sarıtaş and published by Stanford University. This book was released on 2009 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: Diffusion magnetic resonance imaging (MRI) is an MRI method that provides information about random microscopic motion of water molecules in biological tissues. In addition to offering a higher sensitivity for the diagnosis of white matter diseases such as stroke and multiple sclerosis, and producing connectivity maps of the brain, it is a promising prognostic tool in the assessment and treatment response monitoring of cancer in the body. While high in-plane resolution is desirable for all diffusion MRI applications, it is particularly essential for imaging of small structures. Unfortunately, the performance of diffusion MRI techniques is often hindered by a variety of factors including susceptibility variations, field inhomogeneities and bulk physiologic motion. This thesis presents a reduced field-of-view (FOV) single-shot echo-planar imaging (ss-EPI) method to address these problems and enable high-resolution diffusion MRI of targeted regions. The proposed method utilizes a two-dimensional (2D) echo-planar radio-frequency (RF) excitation pulse to achieve a sharp reduced-FOV profile, while still allowing contiguous multi-slice imaging and suppressing the fat signal. Extensive clinical evaluation of the technique demonstrated that sub-mm diffusion-weighted imaging (DWI) on human spinal cords is feasible with minimal artifacts. High-resolution fiber tractography of the spinal cord successfully visualized the connectivity between the cord and the medulla oblongata, delineating internal structures such as gray/white matter. In vivo DWI of the larynx, breast and prostate validated the effectiveness of this technique in providing detailed depiction of the morphology outside the central nervous system. When the exponential diffusion attenuation is combined with high spatial resolution, DWI may suffer from poor signal-to-noise ratio (SNR). The last part of this thesis presents an optimization strategy for the DWI parameters as a function of the imaging SNR. Specifically, the optimum b-value is shown to be a monotonically increasing function of the imaging SNR, with a convergence asymptote identical to the previously proposed values in literature. The effects of T2 relaxation are also incorporated for a more accurate optimization. In vitro and in vivo experiments demonstrated reduced error in ADC estimations and improved SNR in the diffusion-weighted images with the proposed technique.
Author :
Publisher :
ISBN 13 :
Total Pages : 292 pages
Book Rating : 4.:/5 (137 download)
Download or read book High-resolution Diffusion-weighted Magnetic Resonance Imaging: Development and Application of Novel Radial Fast Spin-echo Acquisitions written by and published by . This book was released on 2006 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: Diffusion-weighted Magnetic Resonance Imaging (DWI) has become a useful tool in medicine for the purpose of diagnosis, tracking disease progression, and monitoring response to therapy. The current techniques used for DWI suffer from artifacts due to magnetic field inhomogeneities, image distortion, and low spatial resolution. The aim of the presented work is to advance DWI by improving upon and developing novel high-resolution acquisition techniques. The approach taken for this purpose was to utilize radial fast spin-echo data acquisitions, which have been shown to produce high-resolution DWI without artifacts due to magnetic field inhomogeneities. In addition, there is little image distortion in radial fast spin-echo DWI, which allows for direct overlay onto anatomical MRI. However, a draw back is that radial methods require longer scan times. By increasing the imaging speed of existing radial fast spin-echo acquisitions, it may become a more practical clinical tool. In addition, novel acquisition techniques are developed that push high-resolution to all three dimensions. By employing a three-dimensional radial fast spin-echo acquisition, voxels in an image have equal size in each dimension and can be on the order of 1mm3. By decreasing the voxel size, the tissue contained within a voxel is more homogeneous. This is important for DWI applications that aim to measure the microscopic integrity of the tissue. The development and analysis of the novel radial fast spin-echo techniques are presented in this work along with several clinical applications. The remaining issues to be addressed for application to quantitative DWI measures are also presented, along with possible solutions.
Author : Dimitris Metaxas
Publisher : Springer
ISBN 13 : 354085990X
Total Pages : 1161 pages
Book Rating : 4.5/5 (48 download)
Download or read book Medical Image Computing and Computer-Assisted Intervention - MICCAI 2008 written by Dimitris Metaxas and published by Springer. This book was released on 2008-10-30 with total page 1161 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 11th International Conference on Medical Imaging and Computer Assisted Intervention, MICCAI 2008, was held at the Helen and Martin Kimmel Center of New York University, New York City, USA on September 6–10, 2008. MICCAI is the premier international conference in this domain, with - depth papers on the multidisciplinary ?elds of biomedical image computing and analysis, computer assisted intervention and medical robotics. The conference brings together biological scientists, clinicians, computer scientists, engineers, mathematicians, physicists and other interested researchers and o?ers them a forum to exchange ideas in these exciting and rapidly growing ?elds. The conference is both very selective and very attractive: this year we - ceived a record number of 700 submissions from 34 countries and 6 continents, fromwhich258papers were selectedfor publication,whichcorrespondsto a s- cess rate of approximately 36%. Some interesting facts about the distribution of submitted and accepted papers are shown graphically at the end of this preface. The paper selection process this year was based on the following procedure, which included the introduction of several novelties over previous years. 1. A ProgramCommittee (PC) of 49 members was recruited by the Program Chairs,to getthenecessarybody ofexpertiseandgeographicalcoverage.All PC members agreed in advance to participate in the ?nal paper selection process. 2. Key words grouped in 7 categories were used to describe the content of the submissions and the expertise of the reviewers.
Author : Moo K. Chung
Publisher : Cambridge University Press
ISBN 13 : 110718486X
Total Pages : 343 pages
Book Rating : 4.1/5 (71 download)
Download or read book Brain Network Analysis written by Moo K. Chung and published by Cambridge University Press. This book was released on 2019-06-27 with total page 343 pages. Available in PDF, EPUB and Kindle. Book excerpt: This coherent mathematical and statistical approach aimed at graduate students incorporates regression and topology as well as graph theory.
Author : Maryam Afzali
Publisher : Frontiers Media SA
ISBN 13 : 2832550754
Total Pages : 148 pages
Book Rating : 4.8/5 (325 download)
Download or read book Diffusion-Weighted MR Imaging (DW-MRI) and Diffusion-Weighted MR Spectroscopy (DW-MRS) written by Maryam Afzali and published by Frontiers Media SA. This book was released on 2024-06-26 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic Resonance Imaging (MRI) is a unique technique that provides tissue-specific contrast non-invasively. However, even at ultra-high field, resolution remains on the millimeter scale, far above cellular microstructure. Taking the fact that diffusion of nuclear spins in magnetic field gradients results in a characteristic signal loss, MRI can be sensitized to water-diffusion (DW-MRI) to recover microstructural information indirectly. Diffusion-Weighted MR Spectroscopy (DW-MRS) goes one step further by not measuring the diffusion of tissue water but of cell-type specific metabolites. Given that, both techniques can provide complementary information: DW-MRI on water diffusion with high spatial resolution but without cellular specificity, and DW-MRS on cell-type specific metabolite diffusion but with a limited spatial resolution (single-volume) and at a lower signal-to-noise ratio (SNR). To meet the needs of sophisticated tissue and cell modeling strategies to derive quantitative microstructural measures both techniques have to be sensitized to specific length scales and structural features. This can only be achieved by constant development in sequence design, diffusion-encoding, tissue modeling, data processing, and technical equipment. This research topic aims to attract contributions from all these fields targeting DW-MRI and DW-MRS improvement to accomplish two fundamental goals: (1) providing unique intra-voxel distributions of a set of diffusion parameters instead of an averaged value; allowing the identification of multiple compartments and tissue microstructure, (2) enabling higher accuracy and precision in derived quantitative values. Acquisitional, computational, and pulse design technological breakthroughs have positioned DW-MRI and DW-MRS as powerful emerging modalities for studying biological media, from muscle to the central nervous system, exhibiting extraordinary sensitivity and specificity in differentiating normal from pathologic cell-level processes and microstructural alterations. We welcome studies and manuscripts covering all aspects of DW-MRI, DW-MRS, tissue/cell modeling, study protocol design, or technical innovation: from theoretical studies focusing on the mathematical and physiological background of tissue microstructural modeling, to technical developments, to phantom studies, to novel acquisition and sampling strategies, to improved diffusion encoding techniques, to clinical studies. We are encouraging the submission of the following types of manuscripts: original research and brief research reports, methods, protocols and study protocols, review and mini review, perspective, hypothesis and theory, technology and code, clinical trial, case report, classification, and data report. Topics for submitted papers can be in one of the following general categories: - Development of processing methods, instrumentation, or experimental design of DW-MRI and DW-MRS. - Introduction of new theoretical or simulation models to DW-MRI or DW-MRS. - In vivo (human and animal), in vitro, in silico, phantom, and ex vivo studies are welcome.
Author : Nader Metwalli
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (68 download)
Download or read book High Angular Resolution Diffusion-weighted Magnetic Resonance Imaging written by Nader Metwalli and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Diffusion-weighted magnetic resonance imaging (MRI) has allowed unprecedented non-invasive mapping of brain neural connectivity in vivo by means of fiber tractography applications. Fiber tractography has emerged as a useful tool for mapping brain white matter connectivity prior to surgery or in an intraoperative setting. The advent of high angular resolution diffusion-weighted imaging (HARDI) techniques in MRI for fiber tractography has allowed mapping of fiber tracts in areas of complex white matter fiber crossings. Raw HARDI images, as a result of elevated diffusion-weighting, suffer from depressed signal-to-noise ratio (SNR) levels. The accuracy of fiber tractography is dependent on the performance of the various methods extracting dominant fiber orientations from the HARDI-measured noisy diffusivity profiles. These methods will be sensitive to and directly affected by the noise. In the first part of the thesis this issue is addressed by applying an objective and adaptive smoothing to the noisy HARDI data via generalized cross-validation (GCV) by means of the smoothing splines on the sphere method for estimating the smooth diffusivity profiles in three dimensional diffusion space. Subsequently, fiber orientation distribution functions (ODFs) that reveal dominant fiber orientations in fiber crossings are then reconstructed from the smoothed diffusivity profiles using the Funk-Radon transform. Previous ODF smoothing techniques have been subjective and non-adaptive to data SNR. The GCV-smoothed ODFs from our method are accurate and are smoothed without external intervention facilitating more precise fiber tractography.
Author : Claudia Leite
Publisher : Thieme
ISBN 13 : 162623020X
Total Pages : 467 pages
Book Rating : 4.6/5 (262 download)
Download or read book Diffusion Weighted and Diffusion Tensor Imaging written by Claudia Leite and published by Thieme. This book was released on 2016-01-16 with total page 467 pages. Available in PDF, EPUB and Kindle. Book excerpt: Diffusion-weighted imaging (DWI) is an integral part of routine neuroimaging, used nearly universally in brain MRIs, and more recently for the spine, spinal cord, and head and neck. DWI provides clinically relevant information on conditions including stroke, infection, and neoplasms. Diffusion tensor imaging (DTI) is a powerful, newer technique with the potential for multiple protocols, including the diagnosis of mild traumatic brain injury and psychiatric disorders. Written by leading authorities in neuroradiology and radiology, Diffusion Weighted and Diffusion Tensor Imaging: A Clinical Guide provides key points and summaries on the concepts and applications required for proper implementation and interpretation of DWI and DTI. Key Features: More than 600 high-quality illustrations Protocols and applications from early childhood to older adulthood Methods to differentiate normal versus pathological states Brain edema pathophysiology and use of DWI to distinguish between cytotoxic and vasogenic edema Utilization of DWI and DTI to diagnose trauma, white matter disease, tumors, cerebrovascular disease, and head, neck, and spine disorders This concise handbook is an invaluable resource for neuroradiologists and radiologists, as well as fellows and residents in these disciplines. With the expanding use of these procedures, neuroscientists, neurologists, neurosurgeons, and psychiatrists will also find it indispensable.
Author : Dow-Mu Koh
Publisher : Springer Science & Business Media
ISBN 13 : 3540785760
Total Pages : 299 pages
Book Rating : 4.5/5 (47 download)
Download or read book Diffusion-Weighted MR Imaging written by Dow-Mu Koh and published by Springer Science & Business Media. This book was released on 2010-01-13 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is a great privilege to introduce this book devoted to the current and future roles in research and clinical practice of another exciting new development in MRI: Diffusi- weighted MR imaging. This new, quick and non-invasive technique, which requires no contrast media or i- izing radiation, offers great potential for the detection and characterization of disease in the body as well as for the assessment of tumour response to therapy. Indeed, whereas DW-MRI is already ? rmly established for the study of the brain, progress in MR techn- ogy has only recently enabled its successful application in the body. Although the main focus of this book is on the role of DW-MRI in patients with malignant tumours, n- oncological emerging applications in other conditions are also discussed. The editors of this volume, Dr. D. M. Koh and Prof. H. Thoeny, are internationally well known for their pioneering work in the ? eld and their original contributions to the l- erature on DW-MRI of the body. I am very much indebted to them for the enthusiasm and engagement with which they prepared and edited this splendid volume in a record short time for our series Medical Radiology – Diagnostic section.
Author : Derek K Jones
Publisher : Oxford University Press
ISBN 13 : 0199708703
Total Pages : 784 pages
Book Rating : 4.1/5 (997 download)
Download or read book Diffusion MRI written by Derek K Jones and published by Oxford University Press. This book was released on 2010-11-11 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt: Professor Derek Jones, a world authority on diffusion MRI, has assembled most of the world's leading scientists and clinicians developing and applying diffusion MRI to produce an authorship list that reads like a "Who's Who" of the field and an essential resource for those working with diffusion MRI. Destined to be a modern classic, this definitive and richly illustrated work covers all aspects of diffusion MRI from basic theory to clinical application. Oxford Clinical Neuroscience is a comprehensive, cross-searchable collection of resources offering quick and easy access to eleven of Oxford University Press's prestigious neuroscience texts. Joining Oxford Medicine Online these resources offer students, specialists and clinical researchers the best quality content in an easy-to-access format.
Author : Kei Yamada
Publisher : Elsevier
ISBN 13 : 9780323759960
Total Pages : 240 pages
Book Rating : 4.7/5 (599 download)
Download or read book MRI Clinics of North America, an Issue of Magnetic Resonance Imaging Clinics of North America, Volume 29-2 written by Kei Yamada and published by Elsevier. This book was released on 2021-05-28 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: This issue of MRI Clinics focuses on Advances in Diffusion-weighted Imaging and is edited by Dr. Kei Yamada. Articles will include: Technical Basics of Diffusion-weighted Imaging; Neurofluid as Assessed by Diffusion-weighted Imaging; Diffusion-weighted Imaging is the Key to Diagnoses; Diffusion-weighted Imaging of the Spinal Cord; Intracranial Abnormalities with Diffusion Restriction; Brain Anatomy by Diffusion-weighted Imaging; Measuring Perfusion: Intravoxel Incoherent Motion; Temperature Measurement by Diffusion-weighted Imaging; Diffusion-weighted Imaging at Ultra-high Field MRI; Diffusion-weighted Imaging for Radiomics; Diffusion Weighted Imaging for Infants; Diffusion-weighted Imaging of the Head and Neck (Including Temporal Bone); DTI, DKI and Q-space Imaging; and more!
Author : Denis Le Bihan
Publisher : CRC Press
ISBN 13 : 0429763492
Total Pages : 563 pages
Book Rating : 4.4/5 (297 download)
Download or read book Intravoxel Incoherent Motion (IVIM) MRI written by Denis Le Bihan and published by CRC Press. This book was released on 2018-11-05 with total page 563 pages. Available in PDF, EPUB and Kindle. Book excerpt: First book ever on the topic Discusses current concepts and methodological issues for the successful implementation of IVIM MRI to investigate tissue perfusion non-invasively Covers a wide range of clinical applications Contributions by leading experts in the field from USA, Europe, and Asia and written with a good balance of methodological and clinical chapters Includes an extensive bibliography for further reading
Author : Emine Ulku Saritas
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (66 download)
Download or read book High-resolution Diffusion MRI of Targeted Regions written by Emine Ulku Saritas and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Diffusion magnetic resonance imaging (MRI) is an MRI method that provides information about random microscopic motion of water molecules in biological tissues. In addition to offering a higher sensitivity for the diagnosis of white matter diseases such as stroke and multiple sclerosis, and producing connectivity maps of the brain, it is a promising prognostic tool in the assessment and treatment response monitoring of cancer in the body. While high in-plane resolution is desirable for all diffusion MRI applications, it is particularly essential for imaging of small structures. Unfortunately, the performance of diffusion MRI techniques is often hindered by a variety of factors including susceptibility variations, field inhomogeneities and bulk physiologic motion. This thesis presents a reduced field-of-view (FOV) single-shot echo-planar imaging (ss-EPI) method to address these problems and enable high-resolution diffusion MRI of targeted regions. The proposed method utilizes a two-dimensional (2D) echo-planar radio-frequency (RF) excitation pulse to achieve a sharp reduced-FOV profile, while still allowing contiguous multi-slice imaging and suppressing the fat signal. Extensive clinical evaluation of the technique demonstrated that sub-mm diffusion-weighted imaging (DWI) on human spinal cords is feasible with minimal artifacts. High-resolution fiber tractography of the spinal cord successfully visualized the connectivity between the cord and the medulla oblongata, delineating internal structures such as gray/white matter. In vivo DWI of the larynx, breast and prostate validated the effectiveness of this technique in providing detailed depiction of the morphology outside the central nervous system. When the exponential diffusion attenuation is combined with high spatial resolution, DWI may suffer from poor signal-to-noise ratio (SNR). The last part of this thesis presents an optimization strategy for the DWI parameters as a function of the imaging SNR. Specifically, the optimum b-value is shown to be a monotonically increasing function of the imaging SNR, with a convergence asymptote identical to the previously proposed values in literature. The effects of T2 relaxation are also incorporated for a more accurate optimization. In vitro and in vivo experiments demonstrated reduced error in ADC estimations and improved SNR in the diffusion-weighted images with the proposed technique.
Author : Antonio Luna
Publisher : Springer Science & Business Media
ISBN 13 : 364221052X
Total Pages : 416 pages
Book Rating : 4.6/5 (422 download)
Download or read book Diffusion MRI Outside the Brain written by Antonio Luna and published by Springer Science & Business Media. This book was released on 2011-11-22 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent advances in MR technology permit the application of diffusion MRI outside of the brain. In this book, the authors present cases drawn from daily clinical practice to illustrate the role of diffusion sequences, along with other morphological and functional MRI information, in the work-up of a variety of frequently encountered oncological and non-oncological diseases. Breast, musculoskeletal, whole-body, and other applications are covered in detail, with careful explanation of the pros and cons of diffusion MRI in each circumstance. Quantification and post-processing are discussed, and advice is provided on how to acquire state of the art images, and avoid artifacts, when using 1.5- and 3-T magnets. Applications likely to emerge in the near future, such as for screening, are also reviewed. The practical approach adopted by the authors, combined with the wealth of high-quality illustrations, ensure that this book will be of great value to practitioners.
Author : Joseph Lee Holtrop
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (988 download)
Download or read book Development and Optimization of High Resolution Multi-shot Magnetic Resonance Acquisitions for Diffusion Weighted Imaging written by Joseph Lee Holtrop and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Karin Markenroth Bloch
Publisher : Elsevier
ISBN 13 : 0323999530
Total Pages : 628 pages
Book Rating : 4.3/5 (239 download)
Download or read book Ultra-High Field Neuro MRI written by Karin Markenroth Bloch and published by Elsevier. This book was released on 2023-08-21 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultra-High Field Neuro MRI is a comprehensive reference and educational resource on the current state of neuroimaging at ultra-high field (UHF), with an emphasis on 7T. Sections cover the MR physics aspects of UHF, including the technical challenges and practical solutions that have enabled the rapid growth of 7T MRI. Individual chapters are dedicated to the different techniques that most strongly benefit from UHF, as well as chapters with a focus on different application areas in anatomical, functional and metabolic imaging. Finally, several chapters highlight the neurological and psychiatric applications for which 7T has shown benefits. The book is aimed at scientists who develop MR technologies and support clinical and neuroscience research, as well as users who want to benefit from UHF neuro MR techniques in their work. It also provides a comprehensive introduction to the field. Presents the opportunities and technical challenges presented by MRI at ultra-high field Describes advanced ultra-high field neuro MR techniques for clinical and neuroscience applications Enables the reader to critically assess the specific UHF advantages over currently available techniques at clinical field strengths
