Measurement of Cerebral Perfusion Using Magnetic Resonance Techniques PDF Download
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 576
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 576
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Book Description
Author: James Duffin
Publisher: Frontiers Media SA
ISBN: 2832550215
Category : Science
Languages : en
Pages : 170
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Book Description
The acquisition of resting cerebral perfusion measures using magnetic resonance imaging (MRI) is one of the assessments of cerebrovascular health used to discern how well patients are coping with anatomical changes such as stenosis, and other factors impacting the supply of blood flow to the brain. Perfusion measures may be obtained using several MRI based techniques including arterial spin labeling (ASL) and dynamic contrast enhanced methods that rely on injected contrast agents such as gadolinium. Recently hypoxia-induced changes in deoxyhemoglobin have been used as a non-invasive contrast agent, measuring the resulting changes in blood oxygen dependent (BOLD) signals with MRI. With each approach, the means through which voxel-wise cerebral perfusion information is derived differs, leading to the development a variety of analysis methods in recent studies. This Research Topic is intended to attract manuscripts that advance the use of resting cerebral perfusion measures in clinical assessments of cerebrovascular health. In pursuit of this aim a better understanding of several aspects are needed.
Author:
Publisher: Elsevier
ISBN: 0080861601
Category : Medical
Languages : en
Pages : 447
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Book Description
Progress in Brain Research is the most acclaimed and accomplished series in neuroscience. The serial is well-established as an extensive documentation of contemporary advances in the field. The volumes contain authoritative reviews and original articles by invited specialists. The rigorous editing of the volumes assures that they will appeal to all laboratory and clinical brain research workers in the various disciplines: neuroanatomy, neurophysiology, neuropharmacology, neuroendocrinology, neuropathology, basic neurology, biological psychiatry and the behavioral sciences.
Author: Nora-Josefin Breutigam
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Magnetic resonance imaging (MRI) is a powerful technique that enables accurate medical diagnoses. Not only does it allow the visualization of static tissue contrasts, but it also provides the ability to measure the function and physiology behind important life processes. This dissertation presents two methods for imaging physiological effects, namely diffusion and perfusion. For diffusion-weighted imaging, but not limited to this application, a technique called simultaneous multi-contrast (SMC) imaging is introduced to acquire multiple image contrasts from different scan types within a single measurement. This technique offers new opportunities in clinical protocols where examination time is a critical factor and multiple image contrasts need to be acquired. The method was tested in a phantom and healthy subjects. The results showed that simultaneous acquisition of two contrasts (here diffusion-weighted imaging and T2*-weighting) with SMC imaging is possible with robust contrast separation and minimal impact on image quality. Thereby, the simultaneous acquisition of multiple contrasts reduces the overall examination time and there is inherent registration between contrasts. For cerebral perfusion-weighted imaging, the goal of this work was to increase the robustness of time-encoded arterial spin labeling (ASL) to image artifacts by adjusting the timing of imaging during active scanning individually for each subject. One of the major challenges in ASL imaging is the high variability of arterial transit times (ATT), which leads to arterial transit delay (ATD) artifacts. In particular, in patients with pathologic changes, these artifacts occur when post-labeling delay (PLD) and bolus duration are not optimally matched to the individual, resulting in difficult quantification of cerebral blood flow (CBF) and ATT. This is also true for the free-lunch (FL) approach in Hadamard-encoded pseudocontinuous ASL (H-pCASL). The method was tested in healthy subjects, with FL-bolus timing individualized by the developed and implemented adaptive H-pCASL sequence in combination with an automatic feedback algorithm. Automatic subject-specific adjustment of the FL-bolus PLD during an ongoing measurement may reduce uncertainties in perfusion quantification and reduce the number of cases in which measurements have to be repeated because the recommended timing does not fit the patient.
Author: Peter B. Barker
Publisher: Cambridge University Press
ISBN: 1107013399
Category : Medical
Languages : en
Pages : 373
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Book Description
This concise and comprehensive review uniquely contains all the information required to perform and interpret clinical MR perfusion imaging.
Author: Edward George Walsh
Publisher:
ISBN:
Category : Blood flow
Languages : en
Pages : 326
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Book Description
Author: A. Gregory Sorensen
Publisher: Thieme
ISBN: 9780865779259
Category : Medical
Languages : en
Pages : 174
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Book Description
This book will familiarize the reader with the basic principles of perfusion MR imaging. Relevant technical aspects, contrast agents, and the postprocessing of images are presented, and imaging protocols are provided. Dedicated software for personal use on the postprocessing of images is provided on a CD-ROM containing hundreds of images and movie clips that demonstrate all concepts. In addition to the technical details of acquisition and postprocessing, numerous examples of the application of these tools in the clinical setting are also shown. In particular, the book includes a discussion of the role of perfusion MRI in the current evaluation of cerebrovascular disease, including an integrative approach using diffusion in conjunction with perfusion imaging. This text covers: all relevant technical aspects of perfusion MR imaging imaging protocols application of these tools in a clinical setting integration of diffusion imaging with perfusion imaging for enhanced diagnostic capabilities Also addressed are the role of perfusion MRI in the assessment of cerebral neoplasia, challenges and opportunities for treatment that tumors present, and the particular strengths of perfusion MRI, such as its relatively high resolution and possible microvascular specificity. For both newcomers and experienced practitioners, this is a nuts-and-bolts description of an important new technique.
Author: James R. Ewing
Publisher:
ISBN:
Category : Cerebral circulation
Languages : en
Pages : 414
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Book Description
Author: Michael Helle
Publisher:
ISBN: 9789491027222
Category :
Languages : en
Pages : 195
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Book Description
Author: Roland Bammer
Publisher: Lippincott Williams & Wilkins
ISBN: 1469889625
Category : Medical
Languages : en
Pages : 2558
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Book Description
Essential reading for both clinicians and researchers, this comprehensive resource covers what you need to know about the basic principles of perfusion, as well as its many clinical applications. Broad coverage outlines the overarching framework that interlinks methods such as DSC, DCE, CTP, and ASL. International experts in the field demonstrate how perfusion and pharmacokinetic imaging can be effectively used to analyze medical conditions, helping you reach accurate diagnoses and monitor disease progression and response to therapy.
