Department of Radiological Science, Shinhan University, Uijeongbu, Republic of Korea.
J Xray Sci Technol. 2023;31(4):837-852. doi: 10.3233/XST-230026.
Due to the wide application of the cone beam computed tomography (CBCT) in clinical practice, it is important to assess radiation dose of CBCT more accurately and efficiently in different clinical applications.
This study aims to calculate effective and absorbed doses in CBCT measured in an anthropomorphic phantom using computer-based Monte Carlo (PCXMC) software, and to conduct comparative evaluations of MOSFET (metal- oxide- semiconductor field-effect transistor) and radiophotoluminescence glass dosimeters (RPLGD).
Effective and absorbed organ doses are compared with those obtained using MOSFET and RPLGD dosimetry in an anthropomorphic phantom given the same exposure settings. Effective and absorbed organ doses from CBCT during scout and main projections are calculated using PCXMC and PCXMCRotation software, respectively.
The mean effective dose from CBCT calculated using PCXMC software is 233.8μSv, while the doses calculated using dosimetry (MOSFET and RPLGD) are 266.67μSv and 268.78μSv, respectively. The X-ray source variation is 0.79%. The prescription limits based on the Friedman test for MOSFET and RPLGD pre-points (i.e., in an analytical analysis of diagnostic names in CBCT) are not statistically significant. The calculated correlation coefficient between MOSFET- and RPLGD-derived absorbed dose values with respect to a field of view CBCT parameter of 17×13.5 mm is r = 0.8623.
The study demonstrates that the PCXMC software may be used as an alternative to MOSFET and RPLGD dosimetry for effective and absorbed organ dose estimation in CBCT conducted with a large FOV in an anthropomorphic phantom.
由于锥形束计算机断层扫描（CBCT）在临床实践中的广泛应用，因此在不同的临床应用中更准确、有效地评估 CBCT 的辐射剂量非常重要。
本研究旨在使用基于计算机的蒙特卡罗（PCXMC）软件计算体模中 CBCT 测量的有效和吸收剂量，并对 MOSFET（金属氧化物半导体场效应晶体管）和放射光致发光玻璃剂量计（RPLGD）进行比较评估。
在体模中使用相同的曝光设置，将有效和吸收器官剂量与使用 MOSFET 和 RPLGD 剂量计获得的器官剂量进行比较。使用 PCXMC 和 PCXMCRotation 软件分别计算 CBCT 扫描和主投影时的有效和吸收器官剂量。
使用 PCXMC 软件计算的 CBCT 平均有效剂量为 233.8μSv，而使用剂量计（MOSFET 和 RPLGD）计算的剂量分别为 266.67μSv 和 268.78μSv。X 射线源变化为 0.79%。基于 Friedman 检验，对于 MOSFET 和 RPLGD 预点（即在 CBCT 诊断名称的分析分析中），处方限值没有统计学意义。对于视野为 17×13.5mm 的 CBCT 参数，MOSFET 和 RPLGD 衍生的吸收剂量值的计算相关系数 r为 0.8623。
本研究表明，PCXMC 软件可替代 MOSFET 和 RPLGD 剂量计，用于在体模中对大视野 CBCT 进行有效和吸收器官剂量估算。
