Fig. 1.

DQE for detection of a uniform disk lesion on a flat background. Left: DQE vs. x-ray fluence (absorbed photons per 100 μm pixel) for fixed optical efficiency (2 photoelectrons per x-ray photon) and difference camera read-noise variances. Right: DQE vs. optical efficiency for different x-ray fluences and noise levels. Typical ${\stackrel{‒}{N}}_m$ in DR is 500 photons per pixel, and typical ${\sigma }_{\mathit{read}}^2$ in a modern DSLR is about 25 (5 electrons RMS).