Primary air kerma at 1 m from the x-ray source: (a) on Hologic Selenia Dimensions, and (b) on Hologic Selenia. Data were normalized per unit mA-minute, and those labeled “display” were calculated from the entrance air kerma reported by the mammographic systems.
Relative K1 distributions of screening and diagnostic examinations. Plotted is the K1 in Tables IV (a) and IV (b) normalized by the total K1 (21 mGy/patient for screening, and 14 mGy/patient for diagnosis) using the highest kVp of each kVp interval, consistent with transmission curve calculation [Eq. (1) ].
Transmission curves for the primary radiation generated by the combined workload distribution of W/Rh, W/Ag, and W/Al in Table IV (c): (a) lead and steel, and (b) concrete, gypsum wallboard, wood, and plate glass.
Transmission of broad W/Ag x-ray beams through common shielding materials: (a) lead, (b) concrete, (c) gypsum wallboard, (d) steel, (e) plate glass, and (f) wood.
Summary of the survey results of three Selenia Dimensions rooms. N Week: Number of examinations per week. For the examinations analyzed in this work, N Survey = N Screening + N Diagnosis. M: Number of 2D views and tomosynthesis scans analyzed in this study.
Number of 2D views and tomosynthesis scans per examination. Combined: Cases of the three rooms analyzed together. Each entry lists average and range in parenthesis. The diagnostic examination in Room A is not listed for two cases.
Examination room workload distribution versus target/filter. K1 and mA-minute were normalized per patient.
Combined workload distribution versus target/filter. K1 and mA-minute were normalized per patient.
Fitting parameters α, β, and γ for the transmission of the primary radiation generated by the combined workload distribution [Table IV (c)].
Fitting results of α, β, and γ for broad tungsten-anode, silver-filter x-ray beams. Units of α and β in mm−1.
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