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Containing more than 450 entries, this easy-to-read encyclopedia provides concise information about the history of and recent trends in drug use and drug abuse in the United States—a societal problem with an estimated cost of $559 billion a year. Despite decades of effort and billions of dollars spent to combat the problem, illicit drug use in the United States is still rampant and shows no sign of abating. Covering illegal drugs ranging from marijuana and LSD to cocaine and crystal meth, this authoritative reference work examines patterns of drug use in American history, as well as drug control and interdiction efforts from the nineteenth century to the present. This encyclopedia provides...
Neruda's masterpiece epic poem about the history of a continent and its people.
Computed tomography (CT) is a widely used x-ray scanning technique. In its prominent use as a medical imaging device, CT serves as a workhorse in many clinical settings throughout the world. It provides answers to urgent diagnostic tasks such as oncology tumor staging, acute stroke analysis, or radiation therapy planning. Spectral Computed Tomography provides a concise, practical coverage of this important medical tool. The first chapter considers the main clinical motivations for spectral CT applications. In Chapter 2, the measurement properties of spectral CT systems are described. Chapter 3 provides an overview of the current state of research on spectral CT algorithms. Based on this overview, the technical realization of spectral CT systems is evaluated in Chapter 4. Device approaches such as DSCT, kV switching, and energy-resolving detectors are compared. Finally, Chapter 5 summarizes various algorithms for spectral CT reconstructions and spectral CT image postprocessing, and links these algorithms to clinical use cases
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This vivid evocation of an ancient civilization is both enlivened and deepened by the author's sympathetic understanding of customs, rituals and myths which to modern eyes may seem both strange and terrible. It will be widely welcomed by scholars and students of South American archaeology and history, by all those curious to know more about a civilization that for thirteen centuries was largely forgotten.
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Since the last Edition of Ophthalmology Examinations Review, there has been major new discovery in the understanding of common eye diseases, and new treatments and diagnostic procedures have been refined or newly developed.A revised Edition reflecting these changes is warranted at this time. The aim and scope of the book will be consistent with the previous two editions in that it will provide a broad review for the final year ophthalmology resident and trainees taking the specialist ophthalmology examinations. The book deals primarily with key facts and topics that are important from an examination perspective. Only information and facts that are considered relevant and critical to the exam...