Optimization of spectral shape in digital mammography: Dependence on anode material, breast thickness, and lesion type

摘要: It has been proposed that breast cancerdetection can be improved through the use of digital mammography. is hypothesized choice proper shape x‐ray spectrum incident upon yield an image signal‐to‐noise ratio (SNR) for a given dose. To test this hypothesis, energy transport model incorporating measured tissue attenuation coefficients and published exposure‐to‐dose conversion values was developed to describe acquisition process. The applied kilovoltage filter Mo W target sources optimized with respect SNR absorbed dose detectors based on Gd2O2S scintillating screen under conditions perfect coupling light between solid state photodetector. For spectra, optimum filter–kVp combinations could provide 41%, 13%, 42% improvements in 2‐cm, 6‐cm 8‐cm breasts, respectively, over conventional filtration, practical imaging time 1.0 s. Mospectra produce similar thickness except 4‐cm breast. Given limitations current technology, however, spectra SNRs shorter thicknesses greater than less 4 cm. maximum both infiltrating ductal carcinoma calcifications provided by same combination, allowing optimization composition only. now used compare improve novel detector designs.