Signal-to-noise ratio and detective quantum efficiency analysis of optically coupled CCD mammography imaging systems

Rationale and Objectives. Design considerations for x-ray systems with optically coupled charge-coupled devices require an understanding of the characteristics of cascaded multistage imaging chains. Performance evaluations rely on accurate analyses of signal-to-noise ratio, noise power spectrum, and detective quantum efficiency. Methods. Theoretic models of signal-to-noise ratio, noise power spectrum, and detective quantum efficiency were extended to analyze the optically coupled charge-coupled device and other electronic x-ray imaging systems. The descriptions of how to measure or compute these parameters are provided. Results. The results of our quantitative analysis illustrate that x-ray quantum-noise limitation can be obtained without an image intensifier by using a low additive noise charge-coupled device. Conclusion. This theoretic model and experimental method provide a useful tool for developing optoelectronic x-ray imaging systems for digital mammography and other radiologic procedures.