[Application of T grain technique to the diagnosis of lung disease and analysis of its image quality].
OBJECTIVE
To compare the image quality of T grain green sensitive film (TML-1) and Lanex Gd(2)O(2)S rare earth intensifying screen with that of XK-1 blue sensitive film and calcium tungstate (CaWO(4)) intensifying screen, and to study the application of T grain technic to the diagnosis of lung diseases.


METHODS
160 coal miners were randomly selected to take both TML-1 and XK-1 chest film of high kV radiographs at the same time. Silver halide granule, fluorescence of intensifying screen, radiographic parameters, the density at different points in the lung and chest radiographs were observed.


RESULTS
Silver grains in TML-1 film were more homogeneous in distribution than in XK-1 film. Luminous intensity of Lanex Gd(2)O(2)S rare earth intensifying screen was brighter than CaWO(4) intensifying screen in the same exposure. The exposure doses of TML-1 film was reduced to one third of XK-1 film. The density of chest radiographs was 0.24 to 2.74 in TML-1 film, and 0.30 to 2.60 in XK-1 film. There were greater exposure latitude and more informations in TML-1 film. By apertured-disc observation, the fine structure of lung in TML-1 film was clearer than in XK-1 film, the shape was more concrete and reliable, visualizability was stronger.


CONCLUSIONS
T grain technique may obviously improve the clearness and resolution of image, and enhance the transmission of information, as well as increase the diagnostic informations.
Liu
Xin-jun
XJ
Medical Imaging Department, Xinjiang Coal Miner General Hospital, Urumqi 830091, China.
Liu
Pei-cheng
PC
Cai
Pei
P
Zhang
Dun
D
Yao
Shi-sheng
SS
D000293:Adolescent; D000328:Adult; D002648:Child; D003952:Diagnostic Imaging / Q000379:methods*; D006801:Humans; D008171:Lung Diseases / Q000175:diagnosis* / Q000000981:diagnostic imaging*; D008297:Male; D011859:Radiography; D012680:Sensitivity and Specificity