Digital chest radiography with a large image intensifier. Evaluation of diagnostic performance and patient exposure.
A digital system for chest radiography based on a large image intensifier was compared with a conventional film-screen system. The diagnostic performance was evaluated with special reference to the digital monitor images with a modified version of receiver operating characteristic (ROC) analysis--free response ROC (FROC) analysis--on a chest equivalent phantom. Measurements of spatial resolution and energy imparted were also performed. The detectability of low-contrast objects as well as spatial resolution was better for the full-size film-screen radiographs than for both the digital monitor images and the 100 mm photofluorograms. The image-intensifier system has a potential for considerable dose savings in relation to the conventional technique provided that fluoroscopy is excluded in the positioning of the patients.
Månsson
L G
LG
Department of Radiation Physics, Sahlgrenska Sjukhuset, University of Gothenburg, Sweden.
Kheddache
S
S
Schlossman
D
D
Börjesson
J
J
Håkansson
E
E
Mattsson
S
S
Tylén
U
U
D004735:Energy Transfer; D005189:False Positive Reactions; D012372:ROC Curve; D011856:Radiographic Image Enhancement / Q000295:instrumentation*; D013902:Radiography, Thoracic