1 What is a digital image? A digital image is an image discretized in spatial coordinates and in brightness. It can be represented by a multidimensional array of integers. 2 What is the difference between a pixel and a voxel?…
1 What is molecular imaging? Molecular imaging is the visualization, characterization, and measurement of biologic processes at the molecular and cellular levels in humans and other living systems. It is essentially a noninvasive means to study in vivo biochemistry and…
Ultrasonography (US) 1 What is ultrasonography (US), and how does it work? US is a structural imaging technique that uses high-frequency mechanical ultrasound waves (with frequencies greater than audible sound waves) to create real-time tomographic (cross-sectional) images. A hand-held transducer…
Radiography 1 What is radiography? Radiography is an imaging technique that uses x-rays to create projectional (2D) images of a region of interest in the body. It is performed by shining x-rays on a film or other image detector with…
Introduction The Digital Revolution began in the latter half of the 20th century with the first uses of digital computers and data storage. The 1970s saw the development of the first microprocessor, Intel’s 4004, which marked the advent of the…
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Introduction Historically, to be successful in their professional careers, radiologists must train intensively for years. They must master a daunting amount of clinical material, pass comprehensive tests, and meet a wide array of challenges in their training. That has not…
Prologue To gain a more meaningful understanding of the current state of affairs with regard to medical malpractice litigation in the United States, we begin by looking back at certain events that have brought us to the present. England, 1765…
Communication in Emergency Radiology Physician-to-Patient Communication Physician-to-patient communication is a unique challenge for radiologists. Radiologists and patients often have isolated encounters, without any prior patient-physician relationship established. Most radiology services, including an emergency radiology service, do not schedule dedicated clinic…
Although many of the quality and safety discussions throughout this volume are applicable to all aspects of radiology including the imaging of children, there are several topics that are especially critical or unique to pediatric patients including radiation reduction, sedation,…