Detector response curves measured for the four systems.
Presampling MTF averaged for the left–right (fast scan) and chest wall-nipple (slow scan) directions across the detector.
Noise (variance) expressed as a fraction of total noise plotted as a function of air kerma at the detector for (a) Agfa HM5.0 needle phosphor (b) Agfa MM3.0R single sided readout powder phosphor (c) Fuji Profect CS dual sided readout powder phosphor (d) Siemens Inspiration a-Se based system.
NNPS as a function of spatial frequency for the Agfa HM5.0 needle phosphor, Agfa MM3.0R single sided readout powder phosphor, Fuji Profect CS dual sided readout powder phosphor, Siemens Inspiration a-Se based systems measured at (a) ∼10 μGy (b) ∼100 μGy and (c) ∼800 μGy. Figure (d) shows NNPS at 5 mm−1 as a function of air kerma at the detector.
Sum of normalized quantum and luminescence noise multiplied by number of photons [(NNPS q + NNPSlum)·Q] versus spatial frequency as used in the CR plate gain calculation.
DQE as a function of spatial frequency measured at ∼100 μGy.
DQE at (a) 1 mm−1 and (b) 5 mm−1 plotted as a function of air kerma at the detector.
(a) Threshold gold thickness measured using the CDMAM test object. Agfa HM5.0 data acquired at 28 kV Mo/Rh and MGD of 2.26 mGy; Agfa MM3.0R data acquired at 28 kV Mo/Rh and MGD of 3.00 mGy; Fuji Profect CS data acquired at 28 Mo/Rh and MGD of 1.51 mGy; Siemens Inspiration data acquired at 28 kV W/Rh and 1.29 mGy. (b) Threshold contrast calculated using the NPWE model for the a-Se (Siemens Inspiration) and needle CR phosphor (Agfa HM5.0) detectors. Calculations were made for detector entrance air kerma values of 50 μGy [top pair of curves], 100 μGy [centre pair of curves]and 200 μGy [bottom pair of curves].
(a) Relative SdNR calculated according to the European Guidelines (b) MGD calculated for the four systems at typical AEC settings.
Beam quality and photons mm−2 μGy−1 for the evaluation spectra; measured detector response curve coefficients; detector uniformity error (coefficient of variation).
MTF at 5 mm−1 in the left–right and chest wall-nipple directions along with ratio of MTF for chest wall-nipple to left–right results (for CR detectors this corresponds to ratio of MTF in slow scan to fast scan directions).
Fractional absorption, NNPSlum·Q and system gain measured at 28 kV, Mo/Rh with 2 mm Al added for the three CR systems.
Peak DQE and DQE at 5 mm−1 at reference air kerma with 2 mm Al added beam filtration.
Acquisition factors for CDMAM test object; mean glandular dose for 50 mm PMMA; threshold gold thickness for 0.1 and 0.25 mm diameter discs; approximate MGD to meet the Acceptable image quality level for 0.1 mm discs.
X-ray acquisition factors, SdNR, and contrast for the AEC acquisitions.
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