Song Chang-Ho, Yeom Han-Gyeol, Kim Jo-Eun, Huh Kyung-Hoe, Yi Won-Jin, Heo Min-Suk, Lee Sam-Sun
Department of Oral and Maxillofacial Radiology and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea.
Department of Oral and Maxillofacial Radiology, College of Dentistry, Daejeon Dental Hospital, Wonkwang University, Daejeon, Korea.
Imaging Sci Dent. 2022 Sep;52(3):283-288. doi: 10.5624/isd.20220129. Epub 2022 May 13.
This study was conducted to measure the radiation exposure and image quality of various cone-beam computed tomography (CBCT) machines under common clinical conditions and to analyze the correlation between them.
Seven CBCT machines used frequently in clinical practice were selected. Because each machine has various sizes of fields of view (FOVs), 1 large FOV and 1 small FOV were selected for each machine. Radiation exposure was measured using a dose-area product (DAP) meter. The quality of the CBCT images was analyzed using 8 image quality parameters obtained using a dental volume tomography phantom. For statistical analysis, regression analysis using a generalized linear model was used.
Polymethyl-methacrylate (PMMA) noise and modulation transfer function (MTF) 10% showed statistically significant correlations with DAP values, presenting positive and negative correlations, respectively (P<0.05). Image quality parameters other than PMMA noise and MTF 10% did not demonstrate statistically significant correlations with DAP values.
As radiation exposure and image quality are not proportionally related in clinically used equipment, it is necessary to evaluate and monitor radiation exposure and image quality separately.
本研究旨在测量常见临床条件下各种锥形束计算机断层扫描（CBCT）机器的辐射剂量和图像质量，并分析两者之间的相关性。
选择临床实践中常用的7台CBCT机器。由于每台机器有不同大小的视野（FOV），因此为每台机器选择1个大视野和1个小视野。使用剂量面积乘积（DAP）仪测量辐射剂量。使用牙科容积断层扫描体模获得的8个图像质量参数分析CBCT图像的质量。统计分析采用广义线性模型进行回归分析。
聚甲基丙烯酸甲酯（PMMA）噪声和10%调制传递函数（MTF）与DAP值具有统计学显著相关性，分别呈正相关和负相关（P<0.05）。除PMMA噪声和10%MTF外的图像质量参数与DAP值无统计学显著相关性。
由于临床使用的设备中辐射剂量和图像质量并非成比例相关，因此有必要分别评估和监测辐射剂量和图像质量。
