Assessment of parameters of digital X-ray detectors using the method of exposure of the working area of the detector to uniform X-ray radiation
It is shown that the main parameters determining the imaging quality of digital X-ray image detectors can be assessed by the method of exposure of the working area of the detector to uniform X-ray radiation. This method makes unnecessary the expert evaluation and measurements using high-precision test objects. It can be used in clinical practice for effective monitoring of the quality of digital X-ray detectors.
Modulation Transfer Function of Radiographic Systems Using Fluorescent Screens
When radiographic film is exposed with fluorescent intensifying screens, the spatial x-ray quantum fluctuations are recorded on the film in the form of density fluctuations (“quantum mottle”). The x-ray quantum fluctuations can be regarded as the input and the quantum mottle as the output of the image-forming system. The Wiener spectrum of the quantum mottle has been used to determine the relative modulation transfer function of two radiographic systems.
Rethinking Health: Healthy or Healthier than?
Theorists of health have, to this point, focused exclusively on trying to define a state—health—that an organism might be in. I argue that they have overlooked the possibility of a comparativist theory of health, which would begin by defining a relation—healthier than—that holds between two organisms or two possible states of the same organism. I show that a comparativist approach to health has a number of attractive features, and has important implications for philosophers of medicine, bioethicists, health economists, and policy makers. 1 Introduction 2 Comparative and Non-comparative Concepts 3 Traditional Theories of Health 4 An Argument for Comparativism: Intergenerational Assessments of Health 5 Another Reason to be a Comparativist: Functionalist Theories of Health 6 A Non-comparative Alternative? 7 An Objection to Comparativism? 8 Why this Matters: The Consequences of Comparativism 1 Introduction 2 Comparative and Non-comparative Concepts 3 Traditional Theories of Health 4 An Argument for Comparativism: Intergenerational Assessments of Health 5 Another Reason to be a Comparativist: Functionalist Theories of Health 6 A Non-comparative Alternative? 7 An Objection to Comparativism? 8 Why this Matters: The Consequences of Comparativism