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目的对比分析不同模式曲面体层摄影的辐射量及图像质量,指导临床进行最优化选择使用。方法回顾性分析2012年1月~2015年12月,山东大学附属省立医院因临床需要重复进行曲面体层摄影的患者60例,使用面积剂量乘积仪分别测量标准、儿童、正交模式曲面体层摄影的面积剂量乘积(67kV/8mA)。采用方差分析,LSD两两比较,对此三种模式曲面体层图像质量进行评价,包括整体图像质量以及颌骨、牙、牙周组织等解剖结构的图像质量。结果标准、儿童及正交模式曲面体层摄影的面积剂量乘积值分别为(57.91±5.32)mGy·cm~2、(48.64±7.21)mGy·cm~2及(50.73±5.70)mGy·cm~2,差异有统计学意义(F=5.779,P<0.05),其中标准和儿童模式的面积剂量乘积值差异有统计学意义(P=0.00),标准和正交模式的面积剂量乘积值差异有统计学意义(P=0.02),儿童和正交模式的面积剂量乘积值差异无统计学意义(P=0.49)。三种模式整体图像质量分值分别为(1.91±0.27)分、(1.91±0.32)分、(1.98±0.43)分,差异无统计学意义(F=0.21,P>0.05)。不同解剖结构的图像质量分值[(1.19±0.12)~(2.70±0.10)]分,差异无统计学意义(P>0.05)。结论儿童或正交模式曲面体层摄影的辐射量较标准模式降低,整体图像质量以及颌骨、牙、牙周组织等解剖结构的图像质量无差异,因此对于颌骨尺寸较小的成年受检者,可以使用儿童或正交模式取代标准模式,以实现辐射防护最优化原则。
Objective To compare and analyze the radiation and image quality of different patterns of surface tomography and guide the clinical choice and optimization. Methods A retrospective analysis of January 2012 ~ December 2015, Shandong Provincial Hospital Provincial Hospital, Shandong Province, the clinical needs of patients with repeated surface tomography 60 cases, the use of area dose meter were measured standard, children, orthogonal mode surface layer The area dose of photographic product (67kV / 8mA). ANOVA and LSD were used to evaluate the image quality of the three body surface images, including the overall image quality and the image quality of the anatomical structures such as jaw, tooth and periodontal tissue. Results The standard dose-product values of surface area and body surface area of children and orthorhombic models were (57.91 ± 5.32) mGy · cm ~ (-2), (48.64 ± 7.21) mGy · cm ~ 2 and (50.73 ± 5.70) mGy · cm ~ 2, the difference was statistically significant (F = 5.779, P <0.05). There was significant difference in the area dose between standard and children model (P = 0.00) Statistical significance (P = 0.02) showed no significant difference between the dose-product values of children and the orthogonal model (P = 0.49). The overall image quality scores of the three modes were (1.91 ± 0.27) points, (1.91 ± 0.32) points and (1.98 ± 0.43) points respectively, with no significant difference (F = 0.21, P> 0.05). There was no significant difference in the image quality score ([1.19 ± 0.12] ~ (2.70 ± 0.10)] between different anatomical structures (P> 0.05). Conclusions The radiation of tomography in children or orthodontic mode is lower than that in standard mode. There is no difference in the overall image quality and the image quality of the anatomical structures such as jaw, tooth and periodontal tissue. Therefore, for adults with smaller jaw size , You can use children or orthogonal mode instead of standard mode, in order to achieve the principle of optimization of radiation protection.