多层螺旋CT（MDCT）与锥形束CT（CBCT）在口咽形态三维评估中的准确性
Accuracy of MDCT and CBCT in three-dimensional evaluation of the oropharynx morphology.
作者信息
Chen Hui, van Eijnatten Maureen, Aarab Ghizlane, Forouzanfar Tim, de Lange Jan, van der Stelt Paul, Lobbezoo Frank, Wolff Jan
机构信息
Departments of Oral Radiology, University of Amsterdam and Vrije Universiteit Amsterdam, The Netherlands.
Oral Kinesiology, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, The Netherlands.
出版信息
Eur J Orthod. 2018 Jan 23;40(1):58-64. doi: 10.1093/ejo/cjx030.
OBJECTIVE
To assess the accuracy of five different computed tomography (CT) scanners for the evaluation of the oropharynx morphology.
METHODS
An existing cone-beam computed tomography (CBCT) data set was used to fabricate an anthropomorphic phantom of the upper airway volume that extended from the uvula to the epiglottis (oropharynx) with known dimensions (gold standard). This phantom was scanned using two multi-detector row computed tomography (MDCT) scanners (GE Discovery CT750 HD, Siemens Somatom Sensation) and three CBCT scanners (NewTom 5G, 3D Accuitomo 170, Vatech PaX Zenith 3D). All CT images were segmented by two observers and converted into standard tessellation language (STL) models. The volume and the cross-sectional area of the oropharynx were measured on the acquired STL models. Finally, all STL models were registered and compared with the gold standard.
RESULTS
The intra- and inter-observer reliability of the oropharynx segmentation was fair to excellent. The most accurate volume measurements were acquired using the Siemens MDCT (98.4%; 14.3 cm3) and Vatech CBCT (98.9%; 14.4 cm3) scanners. The GE MDCT, NewTom 5G CBCT, and Accuitomo CBCT scanners resulted in smaller volumes, viz., 92.1% (13.4 cm3), 91.5% (13.3 cm3), and 94.6% (13.8 cm3), respectively. The most accurate cross-sectional area measurements were acquired using the Siemens MDCT (94.6%; 282.4 mm2), Accuitomo CBCT (95.1%; 283.8 mm2), and Vatech CBCT (95.3%; 284.5 mm2) scanners. The GE MDCT and NewTom 5G CBCT scanners resulted in smaller areas, viz., 89.3% (266.5 mm2) and 89.8% (268.0 mm2), respectively.
LIMITATIONS
Images of the phantom were acquired using the vendor-supplied default airway scanning protocol for each scanner.
CONCLUSION
Significant differences were observed in the volume and cross-sectional area measurements of the oropharynx acquired using different MDCT and CBCT scanners. The Siemens MDCT and the Vatech CBCT scanners were more accurate than the GE MDCT, NewTom 5G, and Accuitomo CBCT scanners. In clinical settings, CBCT scanners offer an alternative to MDCT scanners in the assessment of the oropharynx morphology.
目的
评估五种不同的计算机断层扫描（CT）扫描仪在评估口咽形态方面的准确性。
方法
使用现有的锥形束计算机断层扫描（CBCT）数据集制作一个上气道容积的人体模型，该模型从悬雍垂延伸至会厌（口咽），尺寸已知（金标准）。使用两台多排探测器计算机断层扫描（MDCT）扫描仪（GE Discovery CT750 HD、西门子Somatom Sensation）和三台CBCT扫描仪（NewTom 5G、3D Accuitomo 170、Vatech PaX Zenith 3D）对该模型进行扫描。所有CT图像由两名观察者进行分割，并转换为标准镶嵌语言（STL）模型。在获取的STL模型上测量口咽的容积和横截面积。最后，将所有STL模型进行配准并与金标准进行比较。
结果
口咽分割的观察者内和观察者间可靠性为中等至优秀。使用西门子MDCT（98.4%；14.3 cm³）和Vatech CBCT（98.9%；14.4 cm³）扫描仪获得的容积测量最为准确。GE MDCT、NewTom 5G CBCT和Accuitomo CBCT扫描仪得到的容积较小，分别为92.1%（13.4 cm³）、91.5%（13.3 cm³）和94.6%（13.8 cm³）。使用西门子MDCT（94.6%；282.4 mm²）、Accuitomo CBCT（95.1%；283.8 mm²）和Vatech CBCT（95.3%；284.5 mm²）扫描仪获得的横截面积测量最为准确。GE MDCT和NewTom 5G CBCT扫描仪得到的面积较小，分别为89.3%（266.5 mm²）和89.8%（268.0 mm²）。
局限性
使用各扫描仪供应商提供的默认气道扫描协议获取模型图像。
结论
在使用不同的MDCT和CBCT扫描仪获取的口咽容积和横截面积测量中观察到显著差异。西门子MDCT和Vatech CBCT扫描仪比GE MDCT、NewTom 5G和Accuitomo CBCT扫描仪更准确。在临床环境中，CBCT扫描仪在评估口咽形态方面可作为MDCT扫描仪供替代选择。
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