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Radiology, Vol 121, 473-477, Copyright © 1976 by Radiological Society of North America

ARTICLES

The LSF and MTF of rare-earth oxysulfide intensifying screens

BA Arnold, H Eisenberg and BE Bjarngard

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.




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Copyright © 1976 by the Radiological Society of North America.