Zhang Tianle, Geng Xue, Li Dongxue, Xu Yize, Zhao Yongxia
Department of Radiology, The Affiliated Hospital of Hebei University, Baoding, China.
Department of Radiology, Baoding No.2 hospital, Baoding, China.
Dentomaxillofac Radiol. 2021 Jul 1;50(5):20200428. doi: 10.1259/dmfr.20200428. Epub 2021 Jan 6.
To analyze and compare the radiation dose and image quality of different CT scanning modes on head-neck CT angiography.
A total of 180 patients were divided into Group A and Group B. The groups were further subdivided according to different scanning modes: subgroups A1, A2, A3, B1, B2, and B3. Subgroups A1 and B1 used conventional CT protocol, subgroups A2 and B2 used the kV-Assist scan mode, and subgroups A3 and B3 used the dual-energy gemstone spectral imaging protocol. The CT dose index and dose-length product were recorded. The objective image quality and subjective image evaluation was conducted by two independent radiologists.
The signal-to-noise ratios, contrast-to-noise ratios, and subjective scores of subgroups A3 and B3 were higher than the other subgroups. In subgroups B1 and B2, the subjective scores of 9 patients and 12 patients were lower than 3, respectively. The subjective scores of subgroups B1 and B2 were lower than the other subgroups. There was no statistically significant difference in signal-to-noise ratios, contrast-to-noise ratios, and subjective scores between subgroups A1 and A2. The effective dose of subgroup A2 was 41.7 and 36.4% lower than that in subgroups A1 and A3, respectively ( < 0.05). In Group B, there were no statistically significant differences in CT dose indexvol, dose-length product, and ED among the subgroups ( > 0.05).
In the head-neck CT angiography, the kV-Assist scan mode is recommended for patients with body mass index between 18.5 and 34.9 kg m; gemstone spectral imaging scanning mode is recommended for patients with body mass index ≥34.9 kg m.
分析并比较头颈CT血管造影不同CT扫描模式下的辐射剂量与图像质量。
180例患者分为A组和B组。根据不同扫描模式进一步细分：A1、A2、A3、B1、B2和B3亚组。A1和B1亚组采用传统CT扫描方案，A2和B2亚组采用千伏辅助扫描模式，A3和B3亚组采用双能宝石光谱成像方案。记录CT剂量指数和剂量长度乘积。由两名独立的放射科医生进行客观图像质量和主观图像评估。
A3和B3亚组的信噪比、对比噪声比和主观评分高于其他亚组。在B1和B2亚组中，分别有9例和12例患者的主观评分低于3分。B1和B2亚组的主观评分低于其他亚组。A1和A2亚组之间的信噪比、对比噪声比和主观评分无统计学显著差异。A2亚组的有效剂量分别比A1和A3亚组低41.7%和36.4%（P<0.05）。在B组中，各亚组间的CT剂量指数容积、剂量长度乘积和有效剂量无统计学显著差异（P>0.05）。
在头颈CT血管造影中，体重指数在18.5至34.9kg/m之间的患者推荐采用千伏辅助扫描模式；体重指数≥34.9kg/m的患者推荐采用宝石光谱成像扫描模式。
