A Study on Dose Evaluation in DR System depending on Grid Use

The purpose of this study was to suggest strategies for the appropriateness of grid use and reduction of exposure dose by conducting a survey on the use of a digital radiography(DR) system in 30 general hospitals located in the capital area. With the goal of using its results as basic data in the future, this study measured the change in dose depending on use or no use of a grid. The study method was to conduct a survey on the possession of DR equipment and grid use for examination of the extremities among 30 general hospitals in the capital area. In regard to exposure dose, acryl phantom was used to measure the change in dose depending on use or no use of a grid. The results of the survey questionnaire showed that a grid was used for examination in 97 out of 135 total pieces of equipment, while a grid was not used in the remaining 38 pieces of equipment. With respect to dose evaluation, the dose for each body part depending on use or no use of a grid was measured at 81.50±9.01 μGy and 129.80±0.26 μGy in the acryl phantom thickness of 2.54 cm + 1.0 mmAl, 67.08±0.22 μGy and 110.94±34.66 μGy in the thickness of 5.08 cm + 1.0 mmAl, and 297.99±0.63 μGy and 567.39±1.58 μGy in the thickness of 7.62 cm + 2.0 mmAl. In conclusion, there was a difference of about two-fold or more in the dose depending on use or no use of a grid