Performanceevaluationhas beena discipline ofcomputersciencefor somethirty years. To us, it seemed to be time to take stock of what we - the performance evaluation community - were doing. Towards this end, we decided to organize a workshoponPerformanceEvaluationofComputer SystemsandCommunication Networks, which was held at the international conference and research center for computer science, Schlo Dagstuhl, Germany, September 15-19, 1997. The participantsdiscussed, amongotherthings, thefollowingfundamentalquestions: What are the scienti c contributions of performance evaluation? What is its...
Performanceevaluationhas beena discipline ofcomputersciencefor somethirty years. To us, it seemed to be time to take stock of what we - the performanc...
Until recently, CT scanner performance was limited by a series of compromises. With single-detector scanners, one cannot select thin collimation and still maintain the required extent of volumetric coverage. Slow scans cause motion artifacts that impair image quality. The introduction of multidetector CT technology, however, has revolutionized the field. Currently multidetector, multislice CT scanners acquire up to four channels of data from interweaving spirals. The minimum gantry rotation period is as low as half of a second. This increased scan speed allows for thinner collimation and thus...
Until recently, CT scanner performance was limited by a series of compromises. With single-detector scanners, one cannot select thin collimation and s...
