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.     

Secondary hemorrhage following trauma to the bones and soft tissues of the extremities

An analysis of 16 cases of secondary hemorrhages in injuries of bones and soft tissues of the extremities is presented. The secondary hemorrhages occurred within the period from 16 hours to 27 days after the trauma. Angiographic study is a valuable adjunct for establishing the correct diagnosis. Arrosion of large arterial trunks was the adjunct for establishing the correct diagnosis. Arrosion of large arterial trunks was the basic cause of the secondary hemorrhage. In the prophylaxis of the latter a special importance is attached to a wide wound dissection in primary surgical treatment and to secure hemostasis, especially in the body portions having multilayer musculature.