Abstract
The purpose of this study was to determine the appropriateness of grid use by comparing and evaluating the signal-to-noise ratio (SNR), the peak signal-to-noise ratio (PSNR), the root-mean-squared error (RMSE), and the mean absolute error (MAE) in the image quality for a digital radiography (DR) system with and without a grid with the view that the study results could be used as basic data in the future. The study method for evaluating the dependence of the image quality on grid use was to mount a Bucky table on the DR system and to acquire images by scanning under phantom conditions by using acryl phantoms with thicknesses of 2.54 cm 1.0 mmAl, 5.08 cm 1.0 mmAl, and 7.62 cm 2.0 mmAl. Then, Image J (1.45f) was used to set a region of interest (ROI) on the images acquired with and without a grid before the SNR, PSNR, RMSE, and MAE were analyzed to evaluate the quality of the image. According to the results of the image-quality analysis via an image analysis program, the measured SNR was 23.07 dB, the PSNR 29.95 dB, the RMSE 163.92, and the MAE 149.11 when the dose for the image was constant. Second, there was no significant difference in image quality between using or not using a grid in the acryl phantom. When the grid was not used, the values of the PSNR were 30.10 dB, 30.07 dB, and 30.01 dB when the acryl phantom thickness was 2.54 cm 1.0 mmAl under the conditions of 48 kVp and 1.6 mAs, 2 mAs, and 2.5 mAs, respectively. The values of the PSNR were 30.06 dB and 30.12 dB when the acryl phantom thickness was 5.08 cm 1.0 mmAl under the conditions of 50 kVp and 3.2 mAs and 4 mAs, respectively, and the values of the PSNR was 30.04 dB and 30.06 dB when the acryl phantom thickness was 7.62 cm 2.0 mmAl under the conditions of 70 kVp and 2.5 mAs and 5 mAs, respectively. In conclusion, when an image is acquired in the DR system, factors that can increase the patient dose or decrease image quality must be precisely determined before scanning is conducted.
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Choi, SH., Hwang, SK., Lee, RG. et al. A study on evaluating the image quality in DR a system with and without a grid. Journal of the Korean Physical Society 60, 1977–1982 (2012). https://doi.org/10.3938/jkps.60.1977
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DOI: https://doi.org/10.3938/jkps.60.1977