The influence of the single-event energy-deposition distribution on the signal-to-noise ratio in x-ray images in the presence of scattered radiation.
The single-event energy-deposition distribution has been included in the signal-to-noise ratio for the detection of low-contrast detail in x-ray projection imaging. Calculations for an ideal detector show that this results in a higher signal-to-noise ratio for energy proportional detection than for the counting technique when scattered radiation is present, in contradiction to what has previously been assumed. The difference is less than 20% for photon spectra typical of medical radiography. If scattered radiation is reduced, the difference between energy proportional detection and counting diminishes. For very efficient scatter reduction, counting is slightly better than energy proportional detection.
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Radiation Physics Department, Faculty of Health Sciences, Linköping University, Sweden.
D008962:Models, Theoretical; D011874:Radiometry; D012542:Scattering, Radiation; D014965:X-Rays