임상 적용 차폐물질에 따른 선량 및 CT 화질 변화 분석

Analysis of CT Image Quality Change according to Clinical Application Shielding Materials

수정체가 포함된 Brain CT 스캔 조건 중 관전압을 80, 100, 120 kVp로 변화시켜 적용하고 납, 납 고글, 황산바륨 실리콘 혼합 차폐체를 이용하여 선량의 변화를 분석하고, 차폐체가 화질에 영향을 미치는 정도를 SNR, CNR, SSIM 지수 분석방법을 적용하여 비교 분석해 보았다. 그 결과 모든 차폐물질 적용으로 선량 감소는 하였지만, 선량 감소 차는 크지 않은 것으로 분석되었다(P > 0.05). 또한 차폐물질 적용으로 화질의 변화는 납 고글 적용 시 SNR, CNR이 가장 높았고 SSIM 분석에서도 기준값 1에 가장 근접하여 구조적 유사도가 가장 우수한 것으로 측정되었다. 따라서, 본 연구결과를 기준으로 더욱 다양한 차폐체 적용과 임상실험 결과를 도출하여 적용한다면 차폐체 활용 검사 시 임상 적용기준에 도움을 줄 수 있을 것으로 사료된다.

Among brain CT scan conditions including the lens, the tube voltage was changed to 80, 100, and 120 kVp and applied. The change in dose was analyzed using lead, lead goggles and barium sulfate silicon shielding materials, and the degree of influence of the shielding materials on image quality was compared and analyzed by applying the SNR, CNR, and SSIM index analysis methods. As a result, it was analyzed that although the dose was reduced by applying all shielding materials, the difference in dose reduction was not large (P > 0.05). In addition, as for the change in image quality due to the application of the shielding material, SNR and CNR were the highest when lead goggles were applied, and the structural similarity was measured to be the best as it was closest to the reference value of 1 in SSIM analysis. Therefore, based on the results of this study, it is thought that if more diverse shielding materials and clinical test results are derived and applied, it will be helpful for the clinical application criteria in the case of shielding utilization inspection.