Grids are important tools of the detection part of the X-ray systems for the effective rejection of scattered X-rays and image quality improves at a cost of increased patient dose with their use. Proposed approach provides a quick and practical way of estimating grid performance for different digital fluoroscopic examinations. The correlation coefficients between BF values obtained using two approaches (grid parameters and image quality metrics) were in good agreement. BF and SIF values were also calculated from the images obtained with and without grids. Image contrast for low- and high-contrast objects and high-contrast spatial resolution were measured with simple phantoms using the same scatter thicknesses and tube voltages. The grid parameters such as bucky factor (BF), selectivity (Σ), Contrast improvement factor (CIF), and signal-to-noise improvement factor (SIF) were determined following the measurements of primary, scatter, and total radiations with a digital fluoroscopic system for the thicknesses of 5, 10, 15, 20, and 25 cm polymethyl methacrylate blocks at the tube voltages of 70, 90, and 120 kVp. The aim of this work is to understand the relation between grid performance parameters and some numerical image quality metrics for digital radiological examinations. The choice of appropriate grid or its removal requires a good knowledge of grid characteristics, especially for pediatric digital imaging. Antiscatter grids improve the X-ray image contrast at a cost of patient radiation doses.
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