Comparison of conventional and cone beam CT synthesized cephalograms
Comparison of conventional and cone beam CT synthesized cephalograms
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DOI：
10.1259/dmfr/98032356
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发表时间：
2007-07-01
影响因子：
3.3
通讯作者：
Cevidanes, L.
中科院分区：
文献类型：
--
作者：
Kumar, V.;Ludlow, J. B.;Cevidanes, L.
目的：比较头影测量合成锥形束CT（CBCT）侧位头颅片使用正交和透视投影与那些从传统的头影测量X线片和干skills.Methods：10个头骨成像使用CBCT和传统的头影测量。CBCT体积数据以DICOM格式导出，并导入海豚3D（预发布版本）。从3D虚拟模型创建正交和透视侧位头影测量X线片。在海豚中，在三个不同的时间进行了九次线性测量和五次角度测量。直接在颅骨上测量三个正中矢状标志。透视和传统的图像测量进行了校正已知的放大倍率。使用多变量方差分析（MANOVA）评估测量的重现性。通过使用重复测量MANOVA模型测量，比较图像模式之间的线性和角度测量。结果：除下颌骨单位长度（P = 0.01）外，其他测量值在不同影像学检查方式下均无显著性差异（P > 0.05）。线性正中矢状面测量值显著大于透视CBCT的颅骨测量值，显著小于常规图像的颅骨测量值（P = 0.003）。正交CBCT正中矢状面线性测量的精度显著优于其他模式（P = 0.007）。正交CBCT投影提供了更准确的正中矢状面颅骨测量比透视CBCT或传统的头影测量radiographs.Conclusions：CBCT可以重现传统的头影测量几何相似的精度和准确性。与透视CBCT或传统头影测量图像相比，正交CBCT投影提供了更高的正中矢状面尺寸测量精度。
Objectives: To compare cephalometric measurements from synthesized cone beam CT (CBCT) lateral cephalograms using orthogonal and perspective projections with those from conventional cephalometric radiographs and dry skulls.Methods: Ten skulls were imaged using CBCT and conventional cephalometry. CBCT volume data were exported in DICOM format and imported in Dolphin 3D (pre-release version). Orthogonal and perspective lateral cephalometric radiographs were created from 3D virtual models. Nine linear and five angular measurements were made in Dolphin at three different times. Three calliper measures of midsagittal landmarks were made directly onto skulls. Perspective and conventional image measurements were corrected for known magnification. Reproducibility of measurements was assessed using multivariate analysis of variance (MANOVA). Linear and angular measurements were compared between image modalities by measurement using a repeated measures MANOVA model. Differences and absolute value of differences between image measurements and skull measurements were assessed using analysis of variance (ANOVA).Results: Measurements were not different between the imaging modalities (P > 0.05), except for the mandibular unit length (P = 0.01). Linear midsagittal measurements were significantly greater than skull measurements for perspective CBCT and significantly less than skull measurements for conventional images (P = 0.003). Precision of orthogonal CBCT midsagittal linear measurements was significantly better than the other modalities (P = 0.007). Orthogonal CBCT projections provided more accurate midsagittal skull measurements than perspective CBCT or conventional cephalometric radiographs.Conclusions: CBCT can reproduce conventional cephalometric geometry with similar precision and accuracy. Orthogonal CBCT projections provided greater accuracy of measurement for midsagittal plane dimensions than perspective CBCT or conventional cephalometric images.