Department of Oral Diagnosis, Piracicaba Dental School, State University of Campinas, Piracicaba, SP, Brazil.
Department of Diagnosis & Oral Health, University of Louisville School of Dentistry, 501 South Preston Street, Louisville, KY, 40202, USA.
Clin Oral Investig. 2024 Oct 5;28(10):572. doi: 10.1007/s00784-024-05971-1.
To assess the effective and organ/tissue equivalent radiation doses of different scout projection protocols in four CBCT units.
Optically stimulated luminescence dosimeters (OSLD) were placed in reference anatomical locations in the head and neck segments of an anthropomorphic phantom representing an average adult male. Ten repeated exposures were obtained from each of the twelve scout projections studied, acquired from four maxillofacial cone beam computed tomography (CBCT) units (Midmark EIOS, 3D Accuitomo F170, Veraviewepocs 3D R100, and Veraview X800). The effective and organ/tissue equivalent doses were calculated for each protocol.
Effective doses ranged from 0.7 µSv (Accuitomo F170 60 × 60 mm-anterior maxilla) to 6.9 µSv (Midmark 50 × 50 mm-anterior maxilla). The highest organ/tissue equivalent doses were recorded for the oral mucosa and salivary glands; however, the thyroid was the highest contributor to the effective dose, followed by the salivary glands.
Despite some variability among CBCT machines and protocols, the acquisition of scout projections is a low-dose procedure. The use of scout projections to ensure an adequate position of the region of interest within the field of view is highly desirable as they contribute minimally to overall CBCT patient dose.
评估四种锥形束 CT（CBCT）设备中不同锥形束定位扫描方案的有效剂量和器官/组织当量剂量。
在一个代表成年男性平均体型的人体模型的头颈部，将光激励发光剂量计（OSLD）置于参考解剖位置。从四个颌面锥形束 CT 设备（Midmark EIOS、3D Accuitomo F170、Veraviewepocs 3D R100 和 Veraview X800）中研究的 12 个锥形束定位扫描方案中，每个方案各获得 10 次重复曝光。为每个方案计算有效剂量和器官/组织当量剂量。
有效剂量范围为 0.7 µSv（Accuitomo F170 60×60 mm 前上颌）至 6.9 µSv（Midmark 50×50 mm 前上颌）。口腔黏膜和唾液腺的器官/组织当量剂量最高；然而，甲状腺是有效剂量的最大贡献者，其次是唾液腺。
尽管 CBCT 设备和方案之间存在一定差异，但锥形束定位扫描是一种低剂量的操作。使用锥形束定位扫描来确保感兴趣区域在视野内的位置是否合适是非常可取的，因为它们对总体 CBCT 患者剂量的贡献最小。
