The LSF and MTF of rare-earth oxysulfide intensifying screens.
The line spread function (LSF) and modulation transfer function (MTF) of 9 rare-earth screen/film systems were measured and compared with those of two fast calcium tungstate systems, using double-emulsion films sandwiched between two screens and mounted in regular cassettes. The LSFs were found to fit exponential functions. These results indicate that the increased sensitivity of rare-earth phosphors over calcium tungstate can be used to construct screens with a higher MTF or increased speed. The fast rare-earth systems allow the use of smaller focal spots for increased resolution while reducing the radiation dose to the patient.
D006801:Humans; D008674:Metals, Rare Earth; D011859:Radiography / Q000295:instrumentation*; D013454:Sulfoxides; D013679:Technology, Radiologic
D008674:Metals, Rare Earth; D013454:Sulfoxides