Accuracy of measurements of mandibular anatomy in cone beam computed tomography images
Accuracy of measurements of mandibular anatomy in cone beam computed tomography images
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DOI：
10.1016/j.tripleo.2006.04.008
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发表时间：
2007-04-01
期刊：
影响因子：
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通讯作者：
Garland Hershey, H.
中科院分区：
文献类型：
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作者：
Ludlow, John B.;Laster, William Stewart;Garland Hershey, H.
目标.使用二维和三维软件测量技术测量理想定位和系统性错位的干颅骨的锥形束计算机断层扫描（CBCT）图像。图像测量结果与颅骨卡尺测量结果进行比较。通过测量解剖点和参考线之间的距离，使用全景重建（二维）和轴向切片（三维）的直接测量，评估28个颅骨在理想位置、移位位置和旋转位置的锥形束计算机断层扫描体积。用配对t检验和方差分析（ANOVA）评估颅骨卡尺测量值与图像软件测量值之间的差异。测量的准确性没有显着影响改变颅骨位置或测量的右侧或左侧。对于易于可视化的正畸线，测量精度表示为平均误差小于1.2%的二维测量技术和小于0.6%的三维测量技术。无论采用何种测量技术，解剖测量的变量都更大。二维和三维技术提供了可接受的下颌骨解剖结构的准确测量。锥形束计算机断层扫描测量在图像采集过程中颅骨方向的变化没有显着影响。
Objectives. Cone beam computed tomography (CBCT) images of ideally positioned and systematically mispositioned dry skulls were measured using two-dimensional and three-dimensional software measurement techniques. Image measurements were compared with caliper measurements of the skulls.Study design. Cone beam computed tomography volumes of 28 skulls in ideal, shifted, and rotated positions were assessed by measuring distances between anatomic points and reference wires by using panoramic reconstructions (two-dimensional) and direct measurements from axial slices (three-dimensional). Differences between caliper measurements on skulls and software measurements in images were assessed with paired t tests and analysis of variance (ANOVA).Results. Accuracy of measurement was not significantly affected by alterations in skull position or measurement of right or left sides. For easily visualized orthodontic wires, measurement accuracy was expressed by average errors less than 1.2% for two-dimensional measurement techniques and less than 0.6% for three-dimensional measurement techniques. Anatomic measurements were significantly more variable regardless of measurement technique.Conclusions. Both two-dimensional and three-dimensional techniques provide acceptably accurate measurement of mandibular anatomy. Cone beam computed tomography measurement was not significantly influenced by variation in skull orientation during image acquisition.