Physical Imaging Properties and Low-contrast Performance of a Newly Developed Flat-panel Digital Radiographic System

概要

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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_20_2S-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.
社団法人日本放射線技術学会の論文
2005-12-20