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• W1986753552 abstract "Purpose: Current quality control protocols for digital mammography rely on subjective assessments of image quality or simple measures that are not comparable between vendor platforms. The noise‐equivalent quanta (NEQ) can be expressed in units of image quanta (fluence) for the spatial frequency range of interest, enabling comparisons between systems and x‐ray spectra. The purpose of this work is to explore use of a simple phantom to measure the components of the noise‐equivalent quanta of digital mammography systems for use in routine quality control. Methods: A simple phantom is imaged on six mammography systems from different vendors. The phantom contains uniform regions for measurement of noise power spectrum (NPS), slanted edges for measurement of modulation transfer function (MTF), and objects of various thicknesses for measurement of contrast. Images were acquired at a range of dose levels on each system to examine how measurements scale with dose, and multiple images were taken at a single dose point to examine measurement reproducibility. Results: The phantom and measurement methods show good reproducibility, with average coefficient of variation values of less than or equal to 15% on all systems evaluated. Measured MTF and NPS values are comparable to other published results when the increase in scattered radiation generated by placing the phantom on the breast support is accounted for. Conclusions: Measurement of the parameters required to calculate NEQ from a single image of a simple phantom is practical, and shows promise as a method of evaluating image quality for routine quality control of digital mammography systems." @default.
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• W1986753552 date "2014-02-19" @default.
• W1986753552 modified "2023-10-14" @default.
• W1986753552 title "Method of measuring NEQ as a quality control metric for digital mammography" @default.
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• W1986753552 doi "https://doi.org/10.1118/1.4865175" @default.
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