Cascante-Sequeira Deivi, Oliveira-Santos Christiano, Brasil Danieli Moura, Santaella Gustavo M, Swanson Christine, Blackburn Megan, Scarfe William C, Haiter-Neto Francisco
Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil.
Department of Diagnosis & Oral Health, University of Louisville School of Dentistry, Louisville, KY, USA.
Clin Oral Investig. 2023 Dec;27(12):7881-7888. doi: 10.1007/s00784-023-05380-w. Epub 2023 Nov 23.
To compare the dosimetry between convex triangular fields of view (FOV) and similar dimension cylindrical FOVs of two cone-beam computed tomography (CBCT) models.
Optically stimulated luminescence dosimeters (OSLDs) were placed in fiducial anatomical locations in an anthropomorphic phantom representing an adult head male for dosimetry scans. Convex triangular FOVs (100 × 80 mm/maxilla-mandible; 100 × 50 mm mandible; 100 × 50 mm/maxilla) from Veraviewepocs 3D R100 (J. Morita, Kyoto, Japan) (R100) and Veraview® X800 (J. Morita, Kyoto, Japan) (X800) and cylindrical FOVs from R100 and X800 (80 × 80 mm/maxilla-mandible; 80 × 50 mm/mandible; 80 × 50 mm/maxilla) were obtained, resulting in 12 different scan protocols. Equivalent doses for each relevant organ/tissue and the effective dose for each protocol were calculated. Mean effective doses were compared by the two-way analysis of variance (ANOVA) with Tukey's post hoc test to evaluate the effect of the FOV and device (α = 0.05).
The effective doses ranged between 69 and 324 μSv for the convex triangular FOVs and 76 and 332 μSv for the cylindrical FOVs. Convex triangular FOVs from the R100 device had effective doses 2.3 to 15.3% lower than their corresponding cylindrical FOVs with similar height (p < 0.05), and that difference ranged between 8.8 and 11.8% for the X800 device (p < 0.05).
Convex triangular fields of view delivered slightly lower effective doses than the cylindrical fields of view of similar dimensions in the R100 and X800 CBCT devices.
Understanding the influence of the image geometry formation in effective dose allows optimization to reduce patient dose.
比较两种锥形束计算机断层扫描（CBCT）模型的凸三角形视野（FOV）与尺寸相似的圆柱形FOV之间的剂量学。
将光激励发光剂量计（OSLD）放置在代表成年男性头部的人体模型的基准解剖位置，进行剂量学扫描。获取来自Veraviewepocs 3D R100（日本京都森田公司）（R100）和Veraview® X800（日本京都森田公司）（X800）的凸三角形FOV（100×80 mm/上颌-下颌；100×50 mm下颌；100×50 mm/上颌）以及来自R100和X800的圆柱形FOV（80×80 mm/上颌-下颌；80×50 mm/下颌；80×50 mm/上颌），从而得到12种不同的扫描方案。计算每个相关器官/组织的当量剂量以及每种方案的有效剂量。采用双向方差分析（ANOVA）和Tukey事后检验比较平均有效剂量，以评估FOV和设备的影响（α = 0.05）。
凸三角形FOV的有效剂量范围为69至324 μSv，圆柱形FOV的有效剂量范围为76至332 μSv。R100设备的凸三角形FOV的有效剂量比高度相似的相应圆柱形FOV低2.3%至15.3%（p < 0.05），X800设备的该差异范围为8.8%至11.8%（p < 0.05）。
在R100和X800 CBCT设备中，凸三角形视野所产生的有效剂量略低于尺寸相似的圆柱形视野。
了解图像几何形状形成对有效剂量的影响有助于优化以降低患者剂量。
