Department of Otolaryngology, Xiamen Branch, Zhongshan Hospital, Fudan University, No. 668 JinHu Road, Xiamen, China.
Xiamen Medical College, Xiamen, China.
Jpn J Radiol. 2021 Mar;39(3):233-239. doi: 10.1007/s11604-020-01058-5. Epub 2020 Oct 27.
Cone-beam CT dacryocystography (CBCT-DCG) is a newly developed lacrimal passage imaging technique. This pilot study aimed to determine the effect of reducing tube current on image quality and radiation dose of CBCT-DCG in healthy volunteers.
Thirty volunteers were randomly divided into three groups of ten. Each group of subjects underwent CBCT-DCG using a tube current of 13 mA, 10 mA, and 7 mA respectively. The image quality of CBCT-DCG was assessed independently by two observers using three different scoring methods and compared among the groups. The effective dose was estimated and compared among the three different tube current groups.
The CBCT-DCG images provided a high spatial and contrast resolution of the bony structures and the contrast medium. No significant differences were found in the image quality between different tube current groups. Compared with the 13 mA group (49.44 μSv), the effective dose for 10 mA group (38.40 μSv) and 7 mA group (27.12 μSv) decreased by 22.33% and 45.15%, respectively.
By decreasing the tube current, CBCT-DCG can be performed with a significant reduction of effective dose without loss of image quality in healthy volunteers.
锥形束 CT 泪道造影（CBCT-DCG）是一种新开发的泪道成像技术。本研究旨在探讨降低管电流对健康志愿者 CBCT-DCG 图像质量和辐射剂量的影响。
30 名志愿者随机分为三组，每组 10 人。三组分别采用 13mA、10mA 和 7mA 的管电流行 CBCT-DCG。两名观察者分别使用三种不同的评分方法对 CBCT-DCG 图像质量进行独立评估，并对三组间的图像质量进行比较。比较三组不同管电流时的有效剂量。
CBCT-DCG 图像对骨性结构和对比剂均具有较高的空间和对比分辨率。不同管电流组间的图像质量无显著差异。与 13mA 组（49.44μSv）相比，10mA 组（38.40μSv）和 7mA 组（27.12μSv）的有效剂量分别降低了 22.33%和 45.15%。
降低管电流可在不降低图像质量的情况下，显著降低健康志愿者 CBCT-DCG 的有效剂量。
