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Magnetic resonance imaging (MRI) has become an important diagnostic tool with a wide variety of clinical applications. This article provides a qualitative description of physical principles of MRI fundamental to an appreciation of the capabilities and limitations of this complex technology. The same physical principles are used to explain the appearance of(More)
Patterns of deployment and utilization of magnetic resonance (MR) imaging were studied with a Michigan Department of Public Health data base containing data regarding more than 218,000 patient visits. Michigan currently has 16 hospital-based fixed MR systems (magnets), 14 (13 operational) freestanding fixed magnets, and 11 (10 operational) mobile magnets(More)
A significant proportion of diagnostic medical procedures are used in response to public or private policy rather than in response to an individual patient-physician interaction. We have studied the system whereby such policies are developed and implemented in the case of employment-related chest and lumbar spine roentgenograms, which were found to account(More)
High-speed scanning techniques are quickly emerging to provide new applications in the MRI domain. These potential applications range from the reduction of patient examination time to the functional imaging of human cognition. Additionally, flow quantitation is rapidly developing into a clinical diagnostic tool available for routine use. This article(More)
An information-theoretic pattern recognition method was used to construct descriptive models of data related to 1,674 radioisotope lung scan referrals for the purpose of assessing lung scan influence on diagnosis and management of pulmonary embolism. It was observed that, relative to other clinical information available prior to the scan, the lung scan(More)
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