Main Article Content
In a digital radiography system, the irradiation range acts as an important factor that greatly affects the quality of the image, the radiation dose of the patient, and the radiation dose of the adjacent site, so the need to set and manage the irradiation range is required. In this study, SNR and CNR were measured by an image quality evaluation method according to whether the cylinder cone was used/not used when the Water's method, Caldwell method, and Lateral method were performed in the sinus examination method of the head using a cranial phantom, and measured and compared and evaluated the radiation dose of the adjoining cranial region and the thyroid gland. The measurement results showed that the irradiation field area was smaller when the cylinder cone was used than when the cylinder cone was not used. In the quantitative evaluation of the quality of radiographic images, SNR and CNR were measured at higher values when used when compared to when not using a cylinder cone. It was found that the radiation dose of the adjacent site was measured lower when used as a result of comparison with when silicon cone was not used, and was statistically significant. Such result was evaluated as a factor that affects the image quality and the radiation dose due to use / no use of a cylinder cone that can set the irradiation field range in the radiography of the digital radiology system.