Echo-Planar Imaging

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Publisher : Springer Science & Business Media
ISBN 13 : 3642804438
Total Pages : 754 pages
Book Rating : 4.6/5 (428 download)

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Book Synopsis Echo-Planar Imaging by : Franz Schmitt

Download or read book Echo-Planar Imaging written by Franz Schmitt and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 754 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Dost thou love life? Then do not squander time, for that's the stuff life is made oj': Benjamin Franklin This book describes the technical principles and applications of echo-planar imaging (EPI) which, as much as any other technique, has shaped the develop ment of modern magnetic resonance imaging (MRI). The principle of EPI, namely, the acquisition of multiple nuclear magnetic resonance echoes from a single spin excitation, has made it possible to shorten the previously time-con suming MRI data acquisition from minutes to much less than a second. Interest ingly, EPI is one of the oldest MRI techniques, conceived in 1976 by Sir Peter Mansfield only 4 years after the initial description of the principles of MRI. One of the inventors of MRI himself, Mansfield realized that fast data acquisition would be paramount in bringing medical applications of MRI to full fruition. The technological challenges in implementing EPI, however, were formidable. Until the end of the 1980s few people believed that EPI would be clinically useful, since its complexity was far greater than that of "conventional" MRI methods.

MRI from Picture to Proton

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Publisher : Cambridge University Press
ISBN 13 : 1316688259
Total Pages : 405 pages
Book Rating : 4.3/5 (166 download)

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Book Synopsis MRI from Picture to Proton by : Donald W. McRobbie

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.

Echo Planar Imaging Artifact Correction with Parallel Imaging

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Publisher : Open Dissertation Press
ISBN 13 : 9781361038666
Total Pages : 117 pages
Book Rating : 4.0/5 (386 download)

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Book Synopsis Echo Planar Imaging Artifact Correction with Parallel Imaging by : Bin Xie

Download or read book Echo Planar Imaging Artifact Correction with Parallel Imaging written by Bin Xie and published by Open Dissertation Press. This book was released on 2017-01-26 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Echo Planar Imaging Artifact Correction With Parallel Imaging" by Bin, Xie, 解斌, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Echo planar imaging (EPI) is a fast imaging technique that has been widely used in various MRI applications, such diffusion, perfusion and functional magnetic resonance imaging (fMRI). However, the EPI image quality is intrinsically hindered by three major artifacts, i.e., Nyquist ghost, geometric distortion and fat residue. The main objective of this dissertation is to investigate and develop novel methods to correct different EPI artifacts using parallel imaging. Firstly, a new Nyquist ghost and geometric distortion correction method using parallel imaging was proposed in EPI. This method calibrates the parallel imaging from two frames of EPI acquired with different phase labels. Then Nyquist ghost is subsequently removed by reconstructing images from only positive or negative echoes. Meanwhile, this phase labeling strategy shifts the TE of the second frame and allows the B0 field map generation from positive and negative images for distortion correction. The phantom results at 7T and 3T demonstrated that our method could greatly reduce Nyquist ghost even under oblique imaging and poor eddy current conditions, yielding significant improvements over the existing reference scan and image entropy minimization methods, and eliminate the geometric distortion simultaneously. The phantom results indicated that the SNR efficiency was largely preserved while the fMRI results showed no apparent degradation of temporal resolution. Secondly, in order to further improve the SNR performance of parallel imaging in Nyquist ghost correction, a new method which incorporates phase error correction with sensitivity encoding (SENSE) was proposed. This method reconstructs two Nyquist ghost free images from positive or negative echo, and then estimates a phase error map from these two images. Phase error correction is subsequently incorporated into SENSE to reconstruct the final Nyquist ghost free images. Results from phantom and human brain experiments demonstrated that this method was as robust as the other parallel imaging based Nyquist ghost correction techniques even under oblique imaging and poor eddy current conditions. Moreover, SNR measurements in both phantom and in vivo studies suggested that this method did not suffer from noise amplification and provided larger signal-to-noise ratio (SNR) than the others similar parallel imaging based Nyquist ghost correction techniques. Lastly, the parallel imaging was applied to separate water and fat signal in EPI images. This method utilizes the intrinsic chemical shift property of fat. It treats the water and shifted fat signal in composite EPI images as two simultaneously excited images, which are separated by parallel imaging. Two parallel imaging reconstruction algorithms were applied and evaluated for water and fat separation. The human brain EPI results demonstrated the feasibility of using parallel imaging to separate water and fat signal by both algorithms. This method was further applied to brain and liver diffusion weighted imaging, and the results demonstrated it can be used to remove the undesired fat residual signal. In summary, these studies have demonstrated parallel imaging can be used for EPI artifacts correction and benefit EPI-based applications. Subjects: Echo-planar imaging

Echo Planar Imaging

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Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (226 download)

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Book Synopsis Echo Planar Imaging by : David M. Weber

Download or read book Echo Planar Imaging written by David M. Weber and published by . This book was released on 1993 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Handbook of MRI Pulse Sequences

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Publisher : Elsevier
ISBN 13 : 0080533124
Total Pages : 1041 pages
Book Rating : 4.0/5 (85 download)

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Book Synopsis Handbook of MRI Pulse Sequences by : Matt A. Bernstein

Download or read book Handbook of MRI Pulse Sequences written by Matt A. Bernstein and published by Elsevier. This book was released on 2004-09-21 with total page 1041 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic Resonance Imaging (MRI) is among the most important medical imaging techniques available today. There is an installed base of approximately 15,000 MRI scanners worldwide. Each of these scanners is capable of running many different "pulse sequences", which are governed by physics and engineering principles, and implemented by software programs that control the MRI hardware. To utilize an MRI scanner to the fullest extent, a conceptual understanding of its pulse sequences is crucial. Handbook of MRI Pulse Sequences offers a complete guide that can help the scientists, engineers, clinicians, and technologists in the field of MRI understand and better employ their scanner. Explains pulse sequences, their components, and the associated image reconstruction methods commonly used in MRI Provides self-contained sections for individual techniques Can be used as a quick reference guide or as a resource for deeper study Includes both non-mathematical and mathematical descriptions Contains numerous figures, tables, references, and worked example problems

ECHO PLANAR IMAGING ARTIFACT C

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Author :
Publisher : Open Dissertation Press
ISBN 13 : 9781361038673
Total Pages : 144 pages
Book Rating : 4.0/5 (386 download)

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Book Synopsis ECHO PLANAR IMAGING ARTIFACT C by : Bin Xie

Download or read book ECHO PLANAR IMAGING ARTIFACT C written by Bin Xie and published by Open Dissertation Press. This book was released on 2017-01-26 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Echo Planar Imaging Artifact Correction With Parallel Imaging" by Bin, Xie, 解斌, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Echo planar imaging (EPI) is a fast imaging technique that has been widely used in various MRI applications, such diffusion, perfusion and functional magnetic resonance imaging (fMRI). However, the EPI image quality is intrinsically hindered by three major artifacts, i.e., Nyquist ghost, geometric distortion and fat residue. The main objective of this dissertation is to investigate and develop novel methods to correct different EPI artifacts using parallel imaging. Firstly, a new Nyquist ghost and geometric distortion correction method using parallel imaging was proposed in EPI. This method calibrates the parallel imaging from two frames of EPI acquired with different phase labels. Then Nyquist ghost is subsequently removed by reconstructing images from only positive or negative echoes. Meanwhile, this phase labeling strategy shifts the TE of the second frame and allows the B0 field map generation from positive and negative images for distortion correction. The phantom results at 7T and 3T demonstrated that our method could greatly reduce Nyquist ghost even under oblique imaging and poor eddy current conditions, yielding significant improvements over the existing reference scan and image entropy minimization methods, and eliminate the geometric distortion simultaneously. The phantom results indicated that the SNR efficiency was largely preserved while the fMRI results showed no apparent degradation of temporal resolution. Secondly, in order to further improve the SNR performance of parallel imaging in Nyquist ghost correction, a new method which incorporates phase error correction with sensitivity encoding (SENSE) was proposed. This method reconstructs two Nyquist ghost free images from positive or negative echo, and then estimates a phase error map from these two images. Phase error correction is subsequently incorporated into SENSE to reconstruct the final Nyquist ghost free images. Results from phantom and human brain experiments demonstrated that this method was as robust as the other parallel imaging based Nyquist ghost correction techniques even under oblique imaging and poor eddy current conditions. Moreover, SNR measurements in both phantom and in vivo studies suggested that this method did not suffer from noise amplification and provided larger signal-to-noise ratio (SNR) than the others similar parallel imaging based Nyquist ghost correction techniques. Lastly, the parallel imaging was applied to separate water and fat signal in EPI images. This method utilizes the intrinsic chemical shift property of fat. It treats the water and shifted fat signal in composite EPI images as two simultaneously excited images, which are separated by parallel imaging. Two parallel imaging reconstruction algorithms were applied and evaluated for water and fat separation. The human brain EPI results demonstrated the feasibility of using parallel imaging to separate water and fat signal by both algorithms. This method was further applied to brain and liver diffusion weighted imaging, and the results demonstrated it can be used to remove the undesired fat residual signal. In summary, these studies have demonstrated parallel imaging can be used for EPI artifacts correction and benefit EPI-based applications. Subjects: Echo-planar imaging

FRCR Physics Notes

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Publisher :
ISBN 13 : 9781999988524
Total Pages : 320 pages
Book Rating : 4.9/5 (885 download)

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Book Synopsis FRCR Physics Notes by : Christopher Clarke

Download or read book FRCR Physics Notes written by Christopher Clarke and published by . This book was released on 2020-11-13 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive medical imaging physics notes aimed at those sitting the first FRCR physics exam in the UK and covering the scope of the Royal College of Radiologists syllabus. Written by Radiologists, the notes are concise and clearly organised with 100's of beautiful diagrams to aid understanding. The notes cover all of radiology physics, including basic science, x-ray imaging, CT, ultrasound, MRI, molecular imaging, and radiation dosimetry, protection and legislation. Although aimed at UK radiology trainees, it is also suitable for international residents taking similar examinations, postgraduate medical physics students and radiographers. The notes provide an excellent overview for anyone interested in the physics of radiology or just refreshing their knowledge. This third edition includes updates to reflect new legislation and many new illustrations, added sections, and removal of content no longer relevent to the FRCR physics exam. This edition has gone through strict critique and evaluation by physicists and other specialists to provide an accurate, understandable and up-to-date resource. The book summarises and pulls together content from the FRCR Physics Notes at Radiology Cafe and delivers it as a paperback or eBook for you to keep and read anytime. There are 7 main chapters, which are further subdivided into 60 sub-chapters so topics are easy to find. There is a comprehensive appendix and index at the back of the book.

Magnetic Resonance Imaging

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Publisher : John Wiley & Sons
ISBN 13 : 0471720852
Total Pages : 976 pages
Book Rating : 4.4/5 (717 download)

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Book Synopsis Magnetic Resonance Imaging by : Robert W. Brown

Download or read book Magnetic Resonance Imaging written by Robert W. Brown and published by John Wiley & Sons. This book was released on 2014-06-23 with total page 976 pages. Available in PDF, EPUB and Kindle. Book excerpt: New edition explores contemporary MRI principles and practices Thoroughly revised, updated and expanded, the second edition of Magnetic Resonance Imaging: Physical Principles and Sequence Design remains the preeminent text in its field. Using consistent nomenclature and mathematical notations throughout all the chapters, this new edition carefully explains the physical principles of magnetic resonance imaging design and implementation. In addition, detailed figures and MR images enable readers to better grasp core concepts, methods, and applications. Magnetic Resonance Imaging, Second Edition begins with an introduction to fundamental principles, with coverage of magnetization, relaxation, quantum mechanics, signal detection and acquisition, Fourier imaging, image reconstruction, contrast, signal, and noise. The second part of the text explores MRI methods and applications, including fast imaging, water-fat separation, steady state gradient echo imaging, echo planar imaging, diffusion-weighted imaging, and induced magnetism. Lastly, the text discusses important hardware issues and parallel imaging. Readers familiar with the first edition will find much new material, including: New chapter dedicated to parallel imaging New sections examining off-resonance excitation principles, contrast optimization in fast steady-state incoherent imaging, and efficient lower-dimension analogues for discrete Fourier transforms in echo planar imaging applications Enhanced sections pertaining to Fourier transforms, filter effects on image resolution, and Bloch equation solutions when both rf pulse and slice select gradient fields are present Valuable improvements throughout with respect to equations, formulas, and text New and updated problems to test further the readers' grasp of core concepts Three appendices at the end of the text offer review material for basic electromagnetism and statistics as well as a list of acquisition parameters for the images in the book. Acclaimed by both students and instructors, the second edition of Magnetic Resonance Imaging offers the most comprehensive and approachable introduction to the physics and the applications of magnetic resonance imaging.

Echo Planar Imaging

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Publisher :
ISBN 13 :
Total Pages : 22 pages
Book Rating : 4.:/5 (222 download)

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Book Synopsis Echo Planar Imaging by : David M. Weber

Download or read book Echo Planar Imaging written by David M. Weber and published by . This book was released on 1995 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Diffusion MRI

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Publisher : Oxford University Press
ISBN 13 : 0199708703
Total Pages : 784 pages
Book Rating : 4.1/5 (997 download)

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Book Synopsis Diffusion MRI by : Derek K Jones

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.

Introduction to Functional Magnetic Resonance Imaging

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Publisher : Cambridge University Press
ISBN 13 : 1139481304
Total Pages : 479 pages
Book Rating : 4.1/5 (394 download)

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Book Synopsis Introduction to Functional Magnetic Resonance Imaging by : Richard B. Buxton

Download or read book Introduction to Functional Magnetic Resonance Imaging written by Richard B. Buxton and published by Cambridge University Press. This book was released on 2009-08-27 with total page 479 pages. Available in PDF, EPUB and Kindle. Book excerpt: Functional Magnetic Resonance Imaging (fMRI) has become a standard tool for mapping the working brain's activation patterns, both in health and in disease. It is an interdisciplinary field and crosses the borders of neuroscience, psychology, psychiatry, radiology, mathematics, physics and engineering. Developments in techniques, procedures and our understanding of this field are expanding rapidly. In this second edition of Introduction to Functional Magnetic Resonance Imaging, Richard Buxton – a leading authority on fMRI – provides an invaluable guide to how fMRI works, from introducing the basic ideas and principles to the underlying physics and physiology. He covers the relationship between fMRI and other imaging techniques and includes a guide to the statistical analysis of fMRI data. This book will be useful both to the experienced radiographer, and the clinician or researcher with no previous knowledge of the technology.

A Computer Simulation for the Image Reconstruction of Interleaved Echo Planar Magnetic Resonance Scans

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Publisher :
ISBN 13 :
Total Pages : 370 pages
Book Rating : 4.:/5 (58 download)

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Book Synopsis A Computer Simulation for the Image Reconstruction of Interleaved Echo Planar Magnetic Resonance Scans by : Jonathan Matthew Bronstein

Download or read book A Computer Simulation for the Image Reconstruction of Interleaved Echo Planar Magnetic Resonance Scans written by Jonathan Matthew Bronstein and published by . This book was released on 1998 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Image Reconstruction from Non-uniform K-space Sampling in Echo Planar Imaging by Pseudo-inverse Filtering

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Publisher :
ISBN 13 :
Total Pages : 204 pages
Book Rating : 4.:/5 (325 download)

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Book Synopsis Image Reconstruction from Non-uniform K-space Sampling in Echo Planar Imaging by Pseudo-inverse Filtering by : Vincent Alfonso Magnotta

Download or read book Image Reconstruction from Non-uniform K-space Sampling in Echo Planar Imaging by Pseudo-inverse Filtering written by Vincent Alfonso Magnotta and published by . This book was released on 1994 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Functional MRI

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Publisher : Springer
ISBN 13 : 9783540750253
Total Pages : 0 pages
Book Rating : 4.7/5 (52 download)

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Book Synopsis Functional MRI by : P. Pavone

Download or read book Functional MRI written by P. Pavone and published by Springer. This book was released on 1996-09-01 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Every day MRI is gaining more and more appreciation by all me die al specialists for its impressive quality of anatomical images. This morphological information gives consistent help in terms of earlier diagnosis, lesion characterisation, and definition of the extent of disease. However, morphology is not the only infor mation obtained through MRI. Recently, a large number of researchers have exploited the possibility of also obtaining functional information with MRI. Results of brain activation studies have been initially performed in Boston and have been confirmed by investiga tors all over the world. Important functional data can be obtained not only on the brain, but also on the heart and on parenchymal organs. The diffusion nowadays of commercial MR units used with high field gradient and echo planar techniques allows functional data to be obtained in any routine clinical activity. This book appears at the right time to provide information on fMRI to all MR users wanting to obtain clinical experience with this new too1. We thank the authors of each paper for their efforts and for the outstanding contribution both to the seminar and on these pages. We are especially grateful to BRACCO INTERNATIONAL, who generous ly supported the publication of this Syllabus and the European Seminar on Di agnostic and Interventional Radiology (ESDIR), held in Rome on October 26- 28,1995. We hope that this editorial work will be valid as a reference collection of pa pers on this new field of medicine.

Diffusion-weighted Magnetic Resonance Imaging with Readout-segmented Echo-planar Imaging

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Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (16 download)

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Book Synopsis Diffusion-weighted Magnetic Resonance Imaging with Readout-segmented Echo-planar Imaging by : Stephen Robert Frost

Download or read book Diffusion-weighted Magnetic Resonance Imaging with Readout-segmented Echo-planar Imaging written by Stephen Robert Frost and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Spin Preparation Sequences for Echo-planar Imaging

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Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (598 download)

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Book Synopsis Spin Preparation Sequences for Echo-planar Imaging by : Mark Roger Symms

Download or read book Spin Preparation Sequences for Echo-planar Imaging written by Mark Roger Symms and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Actively Shielded Gradient Coils and Echo-planar MRI

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Publisher :
ISBN 13 :
Total Pages : 248 pages
Book Rating : 4.:/5 (344 download)

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Book Synopsis Actively Shielded Gradient Coils and Echo-planar MRI by : Almos Elekes

Download or read book Actively Shielded Gradient Coils and Echo-planar MRI written by Almos Elekes and published by . This book was released on 1993 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: