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논문 기본 정보

자료유형
학술저널
저자정보
김종석 (강남세브란스병원 영상의학과) 주영철 (삼성서울병원) 이승근 (삼성서울병원 영상의학과)
저널정보
대한방사선과학회 방사선기술과학 방사선기술과학 제44권 제4호
발행연도
2021.8
수록면
295 - 300 (6page)

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This study aims to present new chest AP examination exposure conditions through a study on the effect on image quality and patient dose by applying high tube voltage and scatter ray post-processing software during chest AP examination in digital radiography equipment. This study was used a human body phantom and in the chest AP position, the dosimeter was placed horizontally at the thoracic spine 6. The experiment was conducted by dividing into a low tube voltage (70 kVp, 400 ㎃, 3.2 ㎃s) group and a high tube voltage (100 kVp, 400 ㎃, 1.2 ㎃s) group. The collimation size (14″× 17″) and the source to image receptor distance(110 cm) were same applied to both groups. Radiation dose was presented to dose area product and entrance surface dose. Image quality was compared and analyzed by comparing the difference between the signal-to-noise ratio and the contrast-to-noise ratio of the image according to the application of the scatter ray post-processing software under each condition. The average value of the entrance surface dose in the low and high tube voltage conditions was 93.04±0.45 μ㏉ and 94.25±1.51 μ㏉, which was slightly higher in the high tube voltage condition, but the dose area product was 0.97±0.04 μ㏉ and 0.93±0.01 μ㏉. There was a statistically significant difference in the group mean value(p<0.01). In terms of image quality, the values of the signal-to-noise ratio and the contrast noise ratio were higher in the high tube voltage than in the low tube voltage, and decreased when the scattering line post-processing function was used, but the contrast resolution was improved. If there is a scatter ray post-processing function during chest AP examination, it is helpful to actively utilize it to improve the image quality. However, when this function is not available, I thought that applying a higher tube voltage state than a low tube voltage state will help to realize images with a large amount of information without changing the dose.

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