Development of a 2,048 x 2,048-pixel image intensifier-TV digital radiography system. Basic imaging properties and clinical application.
OBJECTIVE
A 2,048 x 2,048-pixel matrix image intensifier (II)-TV digital radiography system has been developed. Potential clinical applications of this new II-TV system were investigated.


METHODS
Basic imaging properties were assessed with clinical applications to gastrointestinal (GI) tract and chest examinations.


RESULTS
Basic imaging properties showed improvement of modulation transfer functions (MTFs) from the 1,024 x 1,024- to the 2,048 x 2,048-pixel matrix and approximated the screen-film system at low spatial frequencies. Receiver operating characteristic (ROC) curves of simulated linear shadows improved similarly. Clinical applications showed that the image quality of the 2,048 x 2,048-pixel matrix was comparable with that of the screen-film system for upper GI and chest radiography, but the image quality of the screen-film system was better for the lower GI tract.


CONCLUSIONS
The authors' II-TV digital radiography system is clinically applicable to gastrointestinal and chest examinations.
Takahashi
M
M
Department of Radiology, Kumamoto University School of Medicine, Japan.
Ueno
S
S
Tsuchigame
T
T
Higashida
Y
Y
Hirata
Y
Y
Moribe
N
N
Takada
T
T
Kamiya
M
M
Koike
K
K
D004064:Digestive System / Q000000981:diagnostic imaging; D005189:False Positive Reactions; D006801:Humans; D012372:ROC Curve; D011856:Radiographic Image Enhancement / Q000295:instrumentation*; D013902:Radiography, Thoracic; D013690:Television