Abstract：Objective To explore the effect of gemstone spectral CT scanning on radiation exposure and image quality in
maxillofacial examination. Methods Forty patients with maxillofacial CT plain scan were divided into two groups (A group and
B group). Each gourp included 20 patients. In A group, the gemstone spectral imaging (GSI) with single source instantaneous
switch of kVp (140 kVp, 80 kVp) on 0.5 ms was performed. And single energy 70 keV level image was reconstructed. In B group,
the conventional polychromatic imaging (CPI) with the tube voltage 120 kVp was performed. The other scanning parameters of two
groups were the same. The signal-to-noise ratio (SNR), image display quality and radiation dose were compared between the two
groups. Results There was no significant difference in SNR of fat, gas, parotid gland and condyle between A group and B group
(-15.02±5.130 and -15.22±6.105, P=0.867丨 -151.71±41.103 and -169.77±73.295, P=0.179丨 0.39±2.821 and 1.22±3.694,
P=0.263丨11.07±5.652 and 11.56±5.873, P=0.701). There was significant difference in the SNR of masseter, submandibular
gland and vitreum between A group and B group (8.58±2.637 and 12.31±3.763, P<0.001丨 7.17±2.407 and 10.24±5.147,
P=0.001丨0.97±0.511 and 2.91±0.867, P<0.001). There was no statistical difference in subjective evaluation between two groups.
And ED of A group and B group were 2.80±0.432 mSv and 3.54±0.737 mSv (P=0.001). Conclusion GSI can effectively reduce
radiation dose compared with CPI without affecting image quality and clinical image diagnosis.
高维青，龚海燕，沈阳，刘玉. 宝石能谱CT与常规CT在颌面部检查中辐射剂量及图像质量的对比研究[J]. 中国医疗设备, 2021, 36(3): 77-80.
GAO Weiqing, GONG Haiyan, SHEN Yang, LIU Yu. Gemstone Spectral CT Imaging in the Maxillofacial Examination: Initial Results of Radiation
Exposure and Image Quality Compared with Conventional CT. China Medical Devices, 2021, 36(3): 77-80.
