[Diagnosis of metastases in thoracic images. Progress by further development of the conventional film-foil technique?].
In addition to digital radiography and AMBER, the development of asymmetric screen-film systems is another attempt to optimize chest radiography. Due to reduced contrast in the parenchyma, the former asymmetric screen-film systems did not show sufficient image quality. Three new asymmetric systems with completely different composition are available now. In-Sight VHC (Kodak), High Light GUV (3M) and Opthos D (Agfa) were compared to standard chest films using densitometric curves, a chest phantom for high and low contrast detectability, a nodule detection phantom and patient studies. The sensitivity of nodule detection in the mediastinum has been 41-48% for L-films and 58-65% for the asymmetric screen-film systems. No differences could be demonstrated for nodule detection in the lung field. Contrast in the parenchyma is equivalent to L-films. There is no loss of diagnostic information in the lung field. Differences between the asymmetric systems concern speed, dynamic range and granularity. If AMBER and digital radiography are not available, new asymmetric screen-film systems can improve nodule detection without further investment costs.
Lehmann
K J
KJ
Institut für Klinische Radiologie, Klinikum der Stadt Mannheim, Fakultät für Klinische Medizin Mannheim, Universität Heidelberg.
Himmighöfer
U
U
D006801:Humans; D008175:Lung Neoplasms / Q000000981:diagnostic imaging / Q000556:secondary*; D008479:Mediastinal Neoplasms / Q000000981:diagnostic imaging / Q000556:secondary; D008953:Models, Anatomic; D011856:Radiographic Image Enhancement / Q000295:instrumentation*; D003074:Solitary Pulmonary Nodule / Q000000981:diagnostic imaging; D014963:X-Ray Intensifying Screens
Metastasendiagnostik auf Thoraxübersichtsaufnahmen. Fortschritte durch die Weiterentwicklung der konventionellen Film-Folien-Technik?