Coelho-Silva Fernanda, Cascante-Sequeira Deivi, Rosado Lucas P Lopes, Lucca Luiza Valdemarca, Freitas Deborah Queiroz, Haiter-Neto Francisco, de-Azevedo-Vaz Sergio Lins
Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil.
Department of Clinical Dentistry, Federal University of Espírito Santo, Espírito Santo, Brazil.
Imaging Sci Dent. 2025 Jun;55(2):165-174. doi: 10.5624/isd.20240218. Epub 2025 Apr 10.
This study aimed to evaluate whether the position and number of high-density objects within the field of view (FOV) affect the volumetric alteration (VA) artifact in cone-beam computed tomography (CBCT) images.
Four cylinders, each made of either cobalt-chromium, titanium, or zirconium, were placed in a phantom for acquisitions using the OP300 Maxio (Instrumentarium Dental, Tuusula, Finland) and Eagle (Dabi Atlante S/A Indústrias Médico Odontológicas, Ribeirão Preto, Brazil) CBCT systems. The cylinders were arranged in 7 different combinations based on their position and number within the FOV. Two oral radiologists segmented the volumes of the cylinders, and VA was calculated as the difference between the tomographic and physical volumes. Statistical analyses included the intraclass correlation coefficient (ICC) and multiway analysis of variance with Tukey's post-hoc test (α=5%).
VA was observed under all experimental conditions. The factors region (anterior/posterior), combination (1 to 7), and material (cobalt-chromium, titanium, or zirconium) significantly influenced VA (<0.05). In general, the presence of 3 cylinders within the FOV reduced VA (<0.05). Although the effect of a cylinder's position varied with the CBCT system, VA typically increased in the posterior region (<0.05). Additionally, titanium exhibited the lowest VA for both CBCT systems (<0.05).
The presence of 3 high-density objects within the FOV reduced VA in CBCT images, whereas positioning an object in the posterior region generally increased its measured volume.
本研究旨在评估视野（FOV）内高密度物体的位置和数量是否会影响锥形束计算机断层扫描（CBCT）图像中的体积改变（VA）伪影。
使用OP300 Maxio（芬兰图苏拉Instrumentarium Dental公司）和Eagle（巴西里贝朗普雷图Dabi Atlante S/A牙科医疗器械公司）CBCT系统，将四个分别由钴铬合金、钛或锆制成的圆柱体放置在模型中进行采集。根据圆柱体在FOV内的位置和数量，将它们排列成7种不同的组合。两名口腔放射科医生对圆柱体的体积进行分割，并将VA计算为断层图像体积与实际体积之间的差值。统计分析包括组内相关系数（ICC）和采用Tukey事后检验的多因素方差分析（α=5%）。
在所有实验条件下均观察到VA。区域（前部/后部）、组合（1至7）和材料（钴铬合金、钛或锆）等因素对VA有显著影响（<0.05）。一般来说，FOV内存在3个圆柱体时VA会降低（<0.05）。尽管圆柱体位置的影响因CBCT系统而异，但VA通常在后部区域增加（<0.05）。此外，对于两种CBCT系统，钛的VA最低（<0.05）。
FOV内存在3个高密度物体可降低CBCT图像中的VA，而将物体放置在后部区域通常会增加其测量体积。
