不同视场CBCT图像线性测量精度的比较

M. Mehdizadeh, Ali Erfani, Parisa Soltani
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摘要

本研究旨在探讨视场(FOV)对锥束计算机断层扫描(CBCT)图像线性测量的影响。方法:采用5个干燥人头骨进行体外实验。用红蜡模拟软组织后,使用Galileos CBCT扫描仪(Sirona, Bensheim, Germany)对颅骨进行扫描,曝光参数为85 kVp和21 ma,体素大小为0.280 mm;一次视场为15厘米× 8厘米,另一次视场为15厘米× 15厘米。测量的距离分别为:轴向观双侧颏孔中心距离(MM)、矢状观中线上牙槽嵴与下颌下缘距离(CB)、左下颌中切牙窝深度(L1)。采用SPSS软件(v. 25, IBM, NY, USA),采用描述性统计和Pearson相关系数进行统计分析(α = 0.05)。结果:小视场、大视场及干颅骨测量无显著性差异(p < 0.05)。与干颅骨相比,小视场测量值具有良好的相关系数,MM值为0.890,CB值为0.954,L1值为0.921 (p < 0.001)。与干颅骨相比,大视场测量值也具有良好的相关系数,MM值为0.894,CB值为0.949,L1值为0.902 (p < 0.001)。结论:根据我们的研究结果,CBCT扫描在小视场和大视场上获得的线性测量结果与在干颅骨上的线性测量结果没有显著差异。由于无论视场大小如何,线性测量都是准确的,因此视场的选择必须基于患者的因素,例如感兴趣的区域和辐射剂量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Comparison of the accuracy of linear measurements in CBCT images with different field of views
This study sought to investigate the effect of the field of view (FOV) on linear measurements of cone beam computed tomography (CBCT) images. Methods: In this in vitro study, five dry human skulls were used. After using red wax to simulate soft tissue, the skulls were scanned using Galileos CBCT scanner (Sirona, Bensheim, Germany) with exposure parameters of 85 kVp and 21 mAs and voxel size of 0.280 mm; once with FOV of 15 cm × 8 cm and once again with 15 cm × 15 cm. The measured distances were the distance between the center of the bilateral mental foramen in the axial view (MM), the distance between the alveolar crest and the mandibular inferior border in the sagittal view on the midline (CB), and the depth of the socket of the left mandibular central incisor (L1). Descriptive statistics as well as Pearson’s correlation coefficient were used for statistical analysis (α = 0.05) using SPSS software (v. 25, IBM, NY, USA). Results: The measurements obtained with small and large FOV and with the dry skull were not significantly different (p > 0.05). The measurements obtained in small FOV had excellent correlation coefficient when compared with those obtained with the dry skull, with values of 0.890 for MM, 0.954 for CB, and 0.921 for L1 (p < 0.001). The measurements in large FOV also had excellent correlation coefficient when compared with those on the dry skull, with values of 0.894 for MM, 0.949 for CB, and 0.902 for L1 (p < 0.001). Conclusion: According to our findings, linear measurements obtained by CBCT scans in small and large FOVs were not significantly different than those on dry skulls. Since the linear measurements are accurate regardless of FOV size, selection of FOV must be based on patient factors, such as area of interest and radiation dose.
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