ABSTRACT
Objective: To evaluate CR (Computer X-ray imaging system) and DR (digital X-ray imaging system) imaging performance, features, advantages and disadvantages, and for application-level comparative analysis instrumentation for clinical application of scientific and rational resource reference. Methods:In the city diethyl hospital radiology shot 852 CR and DR tablets were retrospectively analyzed, focusing on the performance evaluation of two components as affecting the quality characteristics and radiography, focusing compare their clinical applications. Results:CR imaging quality was 89.9%, DR was 94.8%, DR radiography quality is higher than the CR, the difference was statistically significant(x2=7.864, P0.05). Conclusion: CR and DR mutual advantages and disadvantages, CR flexible, and lower cost, but the DR over CR has a higher spatial resolution, wider dynamic range and lower X-ray radiation, and a low rate of waste film radiography speed, high work efficiency. Suggest playing two advantages for clinical applications to provide more choices.
ABSTRACT
In this study, we have conducted characterization of imaging performance for a flat panel digital X-ray detector using amorphous Selenium and a-Si TFT which was developed by the authors. The procedures for characterization were in concordance with internationally recommended standards such as IEC (international electrotechnical commission). The measures used for imaging performance characterization include response characteristic, modulation transfer function (MTF), detective quantum efficiency (DQE), noise power spectrum (NPS), and quantum limited performance. The measured DQEs at lowest and highest spatial frequencies were 40% and 25% respectively, which was superior to that of commercial products by overseas vendor. The MTF values were significantly superior to that of CR and indirect type DRs. The quantum limited performance showed the detector was limited by quantum noise at the entrance exposure level below 0.023 mR, which is sufficiently low for general X-ray examination.