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- W2022884142 abstract "Abstract The use of narrow x -ray spectra to produce the radiographic image allows a reduction in patient exposurewithout any appreciable degradation in image quality. When this method is combined with the use of rare -earthintensifying screens, the performance of the screens is improved primarily in terms of patient exposure. A number of screens have been tested in a case of bone imaging with aluminum filtered beams and with ytterbium filtered beams. A summary of the results in terms of radiation doses and image quality is presented. Introduction The idea of using a narrow interval of x -ray energies to produce the radiographic image has been discussedby several authors, and it has been in the literature for about twenty years (5). However, it was only veryrecently that applications of this idea in clinical work have been reported (10). At present the most con-venient method to obtain narrow x -ray spectra is by filtering the output of a tungsten anode tube, withelements of relatively high atomic number. Narrow x -ray spectra obtained by this method have been used inclinical experiments in which the use of holmium filter for intravenous pyelograms reduced patient skin ex-posure by approximately 65%, and the use of an ytterbium filter in lumbar spine examinations resulted in areduction of skin exposure by an average of 35% (10). These results have been obtained using only calciumt_ungstate screens, and the reductions in exposure have been achieved without any detectable image degradation.The x -ray spectrum used for the intravenous pyelograms was mostly contained within the range between 33 keVand 56 keV, and the interval of energies used for lumbar spine studies was between approximately h0 keV and" @default.
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- W2022884142 date "1976-12-23" @default.
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- W2022884142 title "<title>Improvements In The Performance Of Intensifying Screens By Energy Selective X-Ray Filtration.</title>" @default.
- W2022884142 doi "https://doi.org/10.1117/12.965412" @default.
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