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The physiological magnetic resonance techniques of diffusion imaging, perfusion imaging and spectroscopy offer insights into brain structure, function and metabolism. Until recently, they were mainly applied within the realm of medical research, but with their increasing availability on clinical MRI machines, they are now coming into clinical practice for the evaluation of neuropathology in individual patients. This book provides the reader with a thorough review of the underlying physical principles of each of these methods, as well as comprehensive coverage of their clinical applications. Topics covered include single- and multiple-voxel MRS techniques, MR perfusion based on both arterial spin labelling and dynamic bolus tracking approaches, and diffusion-weighted imaging, including techniques for mapping brain white matter fiber bundles. Clinical applications are reviewed in depth for each technique, with case reports included throughout the book. Attention is also drawn to possible artifacts and pitfalls associated with these techniques.
Established worldwide as the one definitive, encyclopedic reference on headache, The Headaches is now in its thoroughly revised, updated Third Edition. The foremost international authorities examine the mechanisms of over 100 types of headache and provide evidence-based treatment recommendations, including extensive tables of controlled clinical trials. This edition presents the revised International Headache Society classification of headaches and explains how to use this new classification for accurate diagnosis. Many headache entities are discussed for the first time, such as chronic migraines; primary headache attributed to sexual activity; primary stabbing, cough, exertional, and thunderclap headaches; hypnic headaches; and new daily persistent headaches. A new section focuses on childhood headaches. Chapters that focus on headaches in elderly patients and patients with psychiatric or medical diseases are also included.
The magazine that helps career moms balance their personal and professional lives.
The magazine that helps career moms balance their personal and professional lives.
Pub_AbstractText~: The impetus for this study was the need to gain a better understanding of what interaction activities in the virtual classroom affect student outcomes. The purpose was to determine which perceptions of interactions contributed to predicting student outcomes of satisfaction and future enrollment in Web-based courses, while controlling for student characteristics. The problem is that the interaction that occurs in the Web-based classroom is markedly different than what occurs in the traditional classroom setting. The study was a secondary analysis using data from 388 student evaluations of Web-based courses. Using Astin's Input-Environment-Outcome (I-E-O) conceptual framework, influences of student characteristics [inputs] and virtual classroom interactions [environment] on student outcomes were examined. Student input predictors were perceptions of computer skills; knowledge of electronic communications; number of Web-based courses taken; distance living from campus; and age. Environmental predictors included interactions with the instructor, students, technology, and perceptions of presence.