The Experts below are selected from a list of 6501 Experts worldwide ranked by ideXlab platform
Mark E Haacke - One of the best experts on this subject based on the ideXlab platform.
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Susceptibility Weighted Imaging and mapping of micro hemorrhages and major deep veins after traumatic brain injury
Journal of Neurotrauma, 2016Co-Authors: Robin A Hanks, Natalie Wiseman, Changya Peng, Shunke Zhou, Mark E HaackeAbstract:Abstract Micro-hemorrhages are a common result of traumatic brain injury (TBI), which can be quantified with Susceptibility Weighted Imaging and mapping (SWIM), a quantitative Susceptibility mapping approach. A total of 23 TBI patients (five women, 18 men; median age, 41.25 years old; range, 21.69–67.75 years) with an average Glasgow Coma Scale score of 7 (range, 3–15) at admission were recruited at mean 149 d (range, 57–366) after injury. Susceptibility-Weighted Imaging data were collected and post-processed to create SWIM images. The Susceptibility value of small hemorrhages (diameter ≤10 mm) and major deep veins (right septal, left septal, central septal, right thalamostriate, left thalamostriate, internal cerebral, right basal vein of Rosenthal, left basal vein of Rosenthal, and pial veins) were evaluated. Different Susceptibility thresholds were tested to determine SWIM's sensitivity and specificity for differentiating hemorrhages from the veins. A total of 253 deep veins and 173 small hemorrhages we...
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Susceptibility Weighted Imaging in mri basic concepts and clinical applications
2011Co-Authors: Mark E Haacke, Jurgen R ReichenbachAbstract:Description: This book presents the first in–depth reference to discuss Susceptibility Weighted Imaging for students and professionals Within the pages of this book, the reader will find comprehensive coverage of the major concepts that underlie the origins of Susceptibility Weighted Imaging (SWI) in magnetic resonance Imaging (MRI) and its wide range of applications. This book provides readers a thorough understanding of the technique now commonly called SWI, a major enhancement of traditional MRI with the power to produce high–resolution images that are exquisitely sensitive to blood products and iron. Since its inception, SWI has become a powerful tool for investigating a number of important clinical aspects of neuro–Imaging, especially the diagnosis and pathophysiology of traumatic brain injury, the detection of acute hemorrhagic stroke, and the detection of microbleeds in dementia. Edited by the originators of SWI, this groundbreaking text is the definitive resource on this critically important technology. Featuring contributions from the top leaders in the science and clinical use of the modality, the book: Introduces the fundamentals of SWI Presents an even balance between the technical aspects and its clinical applications Explains how to image brain tumors, cerebral microbleeds, and hemorrhage as well as many other clinical applications Explains how to quantify iron content for diseases such as multiple sclerosis, Parkinson's disease, and other neurodegenerative diseases Introduces the use of SWI in visualizing the vessel wall Covers the use of SWI at ultra–high magnetic fields Introduces the important concept of Susceptibility mapping as the next generation of SWI Includes over 100 high–quality images and tables This reference also covers more advanced topics, from improved contrast in MRI of the midbrain using SWI to functional Susceptibility Weighted MRI, automated vein segmentation and lesion detection, rapid acquisition methods, and more. Suitable for all levels of experience, Susceptibility Weighted Imaging in MRI is the ideal source for neuroradiologists, radiologists, Imaging and medical physicists, cardiologists, oncologists, biochemists, and students who want authoritative information on the basic elements and practical applications of this exciting new medical Imaging technique.
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identification of calcification with mri using Susceptibility Weighted Imaging a case study
Journal of Magnetic Resonance Imaging, 2009Co-Authors: Sandeep Mittal, Karl Kish, Mark E HaackeAbstract:Susceptibility Weighted Imaging (SWI) is a new MRI technique that can identify calcification by using phase images. We present a single case with a partially calcified oligodendroglioma, multiple calcified cysticercosis lesions, and multiple physiologic calcifications in the same patient. SWI phase images and computed tomography (CT) images are compared. SWI phase images showed the same calcified lesions as shown on CT and sometimes some new calcifications. Our conclusion is that SWI filtered phase images can identify calcifications as well as CT in this case.
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clinical applications of neuroImaging with Susceptibility Weighted Imaging
Journal of Magnetic Resonance Imaging, 2005Co-Authors: Vivek Sehgal, Jaladhar Neelavalli, Daniel K. Kido, Nathaniel Wycliffe, Karen A. Tong, Mark E Haacke, Zachary Delproposto, Djamel Haddar, Jurgen R ReichenbachAbstract:Susceptibility-Weighted Imaging (SWI) consists of using both magnitude and phase images from a high-resolution, three-dimensional, fully velocity compensated gradient-echo sequence. Postprocessing is applied to the magnitude image by means of a phase mask to increase the conspicuity of the veins and other sources of Susceptibility effects. This article gives a background of the SWI technique and describes its role in clinical neuroImaging. SWI is currently being tested in a number of centers worldwide as an emerging technique to improve the diagnosis of neurological trauma, brain neoplasms, and neurovascular diseases because of its ability to reveal vascular abnormalities and microbleeds.
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Susceptibility Weighted Imaging swi
Magnetic Resonance in Medicine, 2004Co-Authors: Mark E Haacke, Yuchung N Cheng, Jurgen R ReichenbachAbstract:Susceptibility differences between tissues can be utilized as a new type of contrast in MRI that is different from spin density, T1-, or T2-Weighted Imaging. Signals from substances with different magnetic susceptibilities compared to their neighboring tissue will become out of phase with these tissues at sufficiently long echo times (TEs). Thus, phase Imaging offers a means of enhancing contrast in MRI. Specifically, the phase images themselves can provide excellent contrast between gray matter (GM) and white matter (WM), iron-laden tissues, venous blood vessels, and other tissues with susceptibilities that are different from the background tissue. Also, for the first time, projection phase images are shown to demonstrate tissue (vessel) continuity. In this work, the best approach for combining magnitude and phase images is discussed. The phase images are high-pass-filtered and then transformed to a special phase mask that varies in amplitude between zero and unity. This mask is multiplied a few times into the original magnitude image to create enhanced contrast between tissues with different susceptibilities. For this reason, this method is referred to as Susceptibility-Weighted Imaging (SWI). Mathematical arguments are presented to determine the number of phase mask multiplications that should take place. Examples are given for enhancing GM/WM contrast and water/fat contrast, identifying brain iron, and visualizing veins in the brain.
Jurgen R Reichenbach - One of the best experts on this subject based on the ideXlab platform.
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Susceptibility Weighted Imaging in mri basic concepts and clinical applications
2011Co-Authors: Mark E Haacke, Jurgen R ReichenbachAbstract:Description: This book presents the first in–depth reference to discuss Susceptibility Weighted Imaging for students and professionals Within the pages of this book, the reader will find comprehensive coverage of the major concepts that underlie the origins of Susceptibility Weighted Imaging (SWI) in magnetic resonance Imaging (MRI) and its wide range of applications. This book provides readers a thorough understanding of the technique now commonly called SWI, a major enhancement of traditional MRI with the power to produce high–resolution images that are exquisitely sensitive to blood products and iron. Since its inception, SWI has become a powerful tool for investigating a number of important clinical aspects of neuro–Imaging, especially the diagnosis and pathophysiology of traumatic brain injury, the detection of acute hemorrhagic stroke, and the detection of microbleeds in dementia. Edited by the originators of SWI, this groundbreaking text is the definitive resource on this critically important technology. Featuring contributions from the top leaders in the science and clinical use of the modality, the book: Introduces the fundamentals of SWI Presents an even balance between the technical aspects and its clinical applications Explains how to image brain tumors, cerebral microbleeds, and hemorrhage as well as many other clinical applications Explains how to quantify iron content for diseases such as multiple sclerosis, Parkinson's disease, and other neurodegenerative diseases Introduces the use of SWI in visualizing the vessel wall Covers the use of SWI at ultra–high magnetic fields Introduces the important concept of Susceptibility mapping as the next generation of SWI Includes over 100 high–quality images and tables This reference also covers more advanced topics, from improved contrast in MRI of the midbrain using SWI to functional Susceptibility Weighted MRI, automated vein segmentation and lesion detection, rapid acquisition methods, and more. Suitable for all levels of experience, Susceptibility Weighted Imaging in MRI is the ideal source for neuroradiologists, radiologists, Imaging and medical physicists, cardiologists, oncologists, biochemists, and students who want authoritative information on the basic elements and practical applications of this exciting new medical Imaging technique.
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Susceptibility Weighted Imaging at ultra high magnetic field strengths theoretical considerations and experimental results
Magnetic Resonance in Medicine, 2008Co-Authors: Andreas Deistung, Alexander Rauscher, Jan Sedlacik, Jorg Stadler, Stephan Witoszynskyj, Jurgen R ReichenbachAbstract:We present numerical simulations and experimental results for Susceptibility Weighted Imaging (SWI) at 7 T. Magnitude, phase, and SWI contrast were simulated for different voxel geometries and Imaging parameters, resulting in an echo time of 14 msec for optimum contrast between veins and surrounding tissue. Slice thickness of twice the in-plane voxel size or more resulted in optimum vessel visibility. Phantom and in vivo data are in very good agreement with the simulations and the delineation of vessels at 7 T was superior compared to lower field strengths. The phase of the complex data reveals anatomical details that are complementary to the corresponding magnitude images. Susceptibility Weighted Imaging at very high field strengths is a promising technique because of its high sensitivity to tissue Susceptibility, its low specific absorption rate, and the phase's negligible sensitivity to B(1) inhomogeneities.
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clinical applications of neuroImaging with Susceptibility Weighted Imaging
Journal of Magnetic Resonance Imaging, 2005Co-Authors: Vivek Sehgal, Jaladhar Neelavalli, Daniel K. Kido, Nathaniel Wycliffe, Karen A. Tong, Mark E Haacke, Zachary Delproposto, Djamel Haddar, Jurgen R ReichenbachAbstract:Susceptibility-Weighted Imaging (SWI) consists of using both magnitude and phase images from a high-resolution, three-dimensional, fully velocity compensated gradient-echo sequence. Postprocessing is applied to the magnitude image by means of a phase mask to increase the conspicuity of the veins and other sources of Susceptibility effects. This article gives a background of the SWI technique and describes its role in clinical neuroImaging. SWI is currently being tested in a number of centers worldwide as an emerging technique to improve the diagnosis of neurological trauma, brain neoplasms, and neurovascular diseases because of its ability to reveal vascular abnormalities and microbleeds.
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Clinical applications of neuroImaging with Susceptibility‐Weighted Imaging
Journal of Magnetic Resonance Imaging, 2005Co-Authors: Vivek Sehgal, Jaladhar Neelavalli, Daniel K. Kido, Nathaniel Wycliffe, E. Mark Haacke, Karen A. Tong, Zachary Delproposto, Djamel Haddar, Jurgen R ReichenbachAbstract:Susceptibility-Weighted Imaging (SWI) consists of using both magnitude and phase images from a high-resolution, three-dimensional, fully velocity compensated gradient-echo sequence. Postprocessing is applied to the magnitude image by means of a phase mask to increase the conspicuity of the veins and other sources of Susceptibility effects. This article gives a background of the SWI technique and describes its role in clinical neuroImaging. SWI is currently being tested in a number of centers worldwide as an emerging technique to improve the diagnosis of neurological trauma, brain neoplasms, and neurovascular diseases because of its ability to reveal vascular abnormalities and microbleeds.
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Susceptibility Weighted Imaging swi
Magnetic Resonance in Medicine, 2004Co-Authors: Mark E Haacke, Yuchung N Cheng, Jurgen R ReichenbachAbstract:Susceptibility differences between tissues can be utilized as a new type of contrast in MRI that is different from spin density, T1-, or T2-Weighted Imaging. Signals from substances with different magnetic susceptibilities compared to their neighboring tissue will become out of phase with these tissues at sufficiently long echo times (TEs). Thus, phase Imaging offers a means of enhancing contrast in MRI. Specifically, the phase images themselves can provide excellent contrast between gray matter (GM) and white matter (WM), iron-laden tissues, venous blood vessels, and other tissues with susceptibilities that are different from the background tissue. Also, for the first time, projection phase images are shown to demonstrate tissue (vessel) continuity. In this work, the best approach for combining magnitude and phase images is discussed. The phase images are high-pass-filtered and then transformed to a special phase mask that varies in amplitude between zero and unity. This mask is multiplied a few times into the original magnitude image to create enhanced contrast between tissues with different susceptibilities. For this reason, this method is referred to as Susceptibility-Weighted Imaging (SWI). Mathematical arguments are presented to determine the number of phase mask multiplications that should take place. Examples are given for enhancing GM/WM contrast and water/fat contrast, identifying brain iron, and visualizing veins in the brain.
Pierre R Burkhard - One of the best experts on this subject based on the ideXlab platform.
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differentiation between parkinson disease and other forms of parkinsonism using support vector machine analysis of Susceptibility Weighted Imaging swi initial results
European Radiology, 2013Co-Authors: Sven Haller, Simon Badoud, Duy Nguyen, I Barnaure, Marielouise Montandon, Karlolof Lovblad, Pierre R BurkhardAbstract:Objectives To diagnose Parkinson disease (PD) at the individual level using pattern recognition of brain Susceptibility-Weighted Imaging (SWI).
Thierry A. G. M. Huisman - One of the best experts on this subject based on the ideXlab platform.
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Susceptibility-Weighted Imaging in pediatric neuroImaging
Journal of Magnetic Resonance Imaging, 2013Co-Authors: Thangamadhan Bosemani, Andrea Poretti, Thierry A. G. M. HuismanAbstract:Susceptibility-Weighted Imaging (SWI) has become a key MR sequence in pediatric neuroImaging. The usage of SWI has significantly expanded recently. The strength of SWI lies not just in its ability to identify hemorrhage, calcium or nonheme iron by virtue of its Susceptibility artifact, but also more importantly, the blood oxygen level dependent venography principle whereby several diseases can be diagnosed earlier. We are continuing to harness the power of SWI in the field of pediatric neuroImaging. In this paper, we will make a comprehensive review and discuss the utility of SWI in pediatric neuroImaging in establishing the diagnosis, differential diagnosis, and also understanding the pathomechanism of various pediatric brain pathologies.
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Pitfalls in Susceptibility-Weighted Imaging of the pediatric brain.
Journal of Neuroimaging, 2013Co-Authors: Thangamadhan Bosemani, Sylvia I. Verschuuren, Andrea Poretti, Thierry A. G. M. HuismanAbstract:Susceptibility-Weighted Imaging (SWI) is a recently developed high resolution 3-dimensional gradient-echo pulse sequence that accentuates the magnetic Susceptibility of blood, calcium, and nonheme iron. The clinical applications of SWI in pediatric neuroImaging have significantly expanded recently. Potential pitfalls related to blood oxygenation, blood flow, magnetic field strength, and misinterpretation of localization as well as possible mimickers may be misleading and affect the correct interpretation of SWI images. Familiarity with these potential diagnostic pitfalls is important to prevent misdiagnosis and will further enhance the ability of SWI in becoming a robust and reliable technique.
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Susceptibility-Weighted Imaging of the pediatric brain
American Journal of Roentgenology, 2012Co-Authors: Sylvia I. Verschuuren, Andrea Poretti, Sarah Buerki, Maarten H. Lequin, Thierry A. G. M. HuismanAbstract:OBJECTIVE. The purpose of this article is to present and discuss the Susceptibility-Weighted Imaging signal characteristics of the normal pediatric brain and those of a variety of pediatric brain pathologic abnormalities. CONCLUSION. Its high Susceptibility for blood products, iron depositions, and calcifications makes Susceptibility-Weighted Imaging an important additional sequence for the diagnostic workup of pediatric brain pathologic abnormalities. Compared with conventional MRI sequences, Susceptibility-Weighted Imaging may show lesions in better detail or with higher sensitivity. Familiarity with the pediatric Susceptibility-Weighted Imaging signal variance is essential to prevent misdiagnosis.
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Susceptibility Weighted Imaging of the neonatal brain
Clinical Radiology, 2012Co-Authors: Avner Meoded, Andrea Poretti, Frances J. Northington, Aylin Tekes, Jarunee Intrapiromkul, Thierry A. G. M. HuismanAbstract:Susceptibility Weighted Imaging (SWI) is a well-established magnetic resonance technique, which is highly sensitive for blood, iron, and calcium depositions in the brain and has been implemented in the routine clinical use in both children and neonates. SWI in neonates might provide valuable additional diagnostic and prognostic information for a wide spectrum of neonatal neurological disorders. To date, there are few articles available on the application of SWI in neonatal neurological disorders. The purpose of this article is to illustrate and describe the characteristic SWI findings in various typical neonatal neurological disorders.
Simon Badoud - One of the best experts on this subject based on the ideXlab platform.
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differentiation between parkinson disease and other forms of parkinsonism using support vector machine analysis of Susceptibility Weighted Imaging swi initial results
European Radiology, 2013Co-Authors: Sven Haller, Simon Badoud, Duy Nguyen, I Barnaure, Marielouise Montandon, Karlolof Lovblad, Pierre R BurkhardAbstract:Objectives To diagnose Parkinson disease (PD) at the individual level using pattern recognition of brain Susceptibility-Weighted Imaging (SWI).
