RbBr:Tl^+輝尽性蛍光体を用いたdigital radiography 装置による胸部X線写真の評価

概要

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Observer performance experiments were performed with a digital radiography system (Regius model 330:DR system)using photostimulable storage phosphors(RbBr:TI^+)and a conventional screen-film system (HGM-UR1:S-F system)for chest radiography. A phantom lung with simulated opacities was used (nodule, miliary opacity, consolidation, and reticular opacity), and was exposed with the DR system (sampling distance:175μm, 2, 048×2, 048 pixels, 12bits)and S-F system under the same conditions of exposure. Eight physicians with 10 years of almost daily practice in interpreting chest radiographs evaluated the visibility of the simulated opacities and ranked them. The ranking data were analyzed by means of normalized ranked data and the scoring method. Statistical analyses were performed by two-way analysis of variance (ANOVA) and the least significant difference (LSD) method with Studentized t-value, and the confidence coefficients of the ranking were calculated. Evaluation of the visibility of simulated opacities in the lung field showed that the chest radiographs obtained with the DR system using THX2 (look-up table:LUT for chest radiography) were equal to or better than those obtained with the S-F system. In conclusion, the DR system (THX2 with LUT) is a highly useful modality for chest radiography because of its superior performance in comparison with the S-F system under the radiographic conditions used in this study.
2000-01-20