Physical imaging properties and low-contrast performance of a newly developed flat-panel digital radiographic system.
We investigated the clinical usefulness of a newly developed flat-panel detector (FPD) system by comparing its physical imaging properties and low-contrast detectability with those of a current FPD system. The newly developed CsI-based indirect FPD (Canon, CXDI-40C) and current Gd(2)O(2)S-based FPD (Canon CXDI-11) systems were used. Characteristic curves, resolution properties, radiographic noise, detective quantum efficiencies (DQEs) and low-contrast detectability for both systems were measured. The new FPD system showed considerably lower noise levels than those of the current FPD system. DQE (0) s of the new and current FPD systems were 75% and 35%, respectively. Observer performance tests of the contrast-detail (C-D) phantom indicated that the new FPD system can significantly improve low-contrast performance over that obtainable with the current FPD system under the same conditions of exposure. The new FPD system provided approximately 50% reduction in exposure while providing comparable detectability. The newly developed FPD system provides radiographic images with excellent inherent physical image quality and low-contrast performance.
Matsumoto
Masao
M
Division of Health Science, Graduate School of Medicine, Osaka University.
Yamazaki
Tatsuya
T
Nokita
Makoto
M
Hayashida
Shinsuke
S
Yoshida
Akira
A
Ideguchi
Tadamitsu
T
Himuro
Kazuhiko
K
Ohki
Masafumi
M
Kumazawa
Seiji
S
Higashida
Yoshiharu
Y
D002586:Cesium; D007454:Iodides; D009622:Noise; D019047:Phantoms, Imaging; D011856:Radiographic Image Enhancement / Q000295:instrumentation*; D014963:X-Ray Intensifying Screens
D007454:Iodides; D002586:Cesium; C040050:cesium iodide