Data and hardware format standards play a fundamental role in determining the cost and versatility of large scale information systems. The use of digital images in medicine is embryonic (first trimester ?) and developing rapidly.The time is ripe for consideration of standards.The prospective roles of the Federal agencies and professional groups having responsibilities and interests in this field and the potential for coordination are discussed.Non -medical user groups such as NATO, the U.S. Armed Forces, the Defense Advanced Research Projects Agency, and at least one European pattern recognition group have either established standards for their constituent communities or are in the process of so doing.When established, such standards can become binding upon vendors to the community.
AbstractData and hardware format standards play a fundamental role in determining the cost and versatility of large scale information systems. The use of digital images in medicine is embryonic (first trimester?) and developing rapidly. The time is ripe for consideration of standards. The prospective roles of the Federal agencies and professional groups having responsibilities and interests in this field and the potential for coordination are discussed.
Strip (or slot) beam digital radiography has been proposed as an ideal compromise between the excellent scatter rejection of pencil -beam or single -line scanned projection radiography systems and the excellent x -ray utilization of wide area beam systems. Moreover, the Kinestatic Charge Detector (KCD) has been proposed as a strip beam detector candidate with a potential for achieving a spatial resolution of over 5 cy /mm, a quantum detection efficiency (QDE) near unity ( > 90 %) and a local exposure time at a given contrast resolution which is less than other detection techniques (i.e., reduced motion blurring).Several laboratory KCDs containing various numbers of channels have now been constructed and tested which allow a better understanding of the practical performance which can be expected from a strip beam digital radiography system using a KCD.Improved theoretical estimates of the performance of a KCD are presented using (1) an ion transport simulator incorporating a numerical solution for the three -dimensional electric-fields in the KCD and (2) an x -ray Monte Carlo program which was recently modified to include the form factors for coherent and Compton scattering as well as to include L -shell photoelectric interactions.The ion transport simulator allows one to study both ion transmission efficiency and ion arrival time distributions.Using the Monte Carlo program, improved estimates are obtained of patient scatter acceptance, in-detector scattering and detective quantum efficiency (DQE).Improved measurements of spatial resolution are presented as well.
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