Effect of Spatial Position in the Field of View on Dimensional Changes in Cone Beam Computed Tomography.

Mehrdad Panjnoush, Yasaman Kheirandish, Negar Zeini
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Abstract

Objectives: This study aimed to assess the relation between dimensional changes and object location in the field of view (FOV) using cone beam computed tomography (CBCT).

Materials and methods: A custom-made phantom was fabricated from base plate wax. To analyze the accuracy of measurements in horizontal and longitudinal dimensions, aluminum squares (0.5 mm thickness, 10×10 mm dimensions) were constructed and placed in three levels (upper, middle, and lower) and five positions (central, right, left, anterior and posterior). This phantom was scanned using Asahi, Planmeca and NewTom CBCT systems. CBCT scans were measured three times by use of their corresponding software. Statistical analysis was performed using one-way ANOVA, post-hoc test and two-way ANOVA (P<0.05).

Results: The differences between the mean horizontal dimensions of different systems were not significant (P=0.296). However, the differences between the mean longitudinal dimensions of different systems were significant (P=0.039). The differences between the different positions and the mean horizontal and longitudinal dimensions were significant (P<0.001, and P<0.001, respectively). The differences between the mean horizontal dimensions and different levels were not significant (P=0.51), but the differences between the mean longitudinal dimensions and different levels were significant (P<0.001). The interaction effect of level and position on the accuracy of horizontal and longitudinal measurements was significant (P<0.0001).

Conclusions: We found statistically significant differences in most of our comparisons; however, these differences were not clinically significant. Therefore, CBCT could be an accurate device for measurement of dimensions of objects placed in different positions in the FOV.

Abstract Image

Abstract Image

Abstract Image

视场空间位置对锥束计算机断层扫描中尺寸变化的影响。
目的:利用锥束计算机断层扫描(CBCT)研究视场(FOV)中尺寸变化与目标位置的关系。材料与方法:以基板蜡为基材,制作定制的模体。为了分析水平和纵向尺寸测量的准确性,制作了0.5 mm厚度的铝方框(10×10 mm尺寸),并将其放置在三个水平(上、中、下)和五个位置(中、右、左、前、后)。使用Asahi、Planmeca和NewTom CBCT系统扫描幻体。使用相应的软件测量三次CBCT扫描。采用单因素方差分析、事后检验和双因素方差分析进行统计学分析(结果:不同系统的平均水平维度差异无统计学意义(P=0.296)。然而,不同系统的平均纵向维度之间存在显著差异(P=0.039)。不同位置、平均水平和纵向维度之间的差异具有统计学意义(p)。结论:我们的大多数比较差异具有统计学意义;然而,这些差异没有临床意义。因此,CBCT可以作为一种精确测量视场内不同位置物体尺寸的设备。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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