256层螺旋CT结合迭代重建及“三低”肺动脉成像的可行性研究

发布时间：2018-05-26 13:20

本文选题：肺动脉成像 + 辐射剂量　；参考：《放射学实践》2017年02期

【摘要】：目的:探讨256层螺旋CT结合idose4迭代重建及"三低"(低辐射剂量、低浓度对比剂及低对比剂用量)肺动脉成像的可行性。方法:将进行肺动脉CTA检查且体质量指数(BMI)为18.5~25.0kg/m2的80例患者随机分成常规组与"三低"组,每组各40例。常规组扫描参数:管电压120kV,管电流250mAs,对比剂浓度370mg I/mL,对比剂剂量1.0mL/kg;"三低"组扫描参数:管电压100kV,管电流150mAs,对比剂浓度270mg I/mL,对比剂剂量0.5mL/kg。两组均采用idose4迭代重建算法,其余扫描参数一致。由2位高级职称的放射科医师以统一标准对图像质量进行主观评分;图像质量客观评价指标包括肺动脉CT值、信噪比(SNR)、对比噪声比(CNR);辐射剂量评价指标包括平均容积CT剂量指数(CTDIvol)、剂量长度乘积(DLP)和有效剂量(ED)。两组图像质量主、客观评价结果的比较及辐射剂量的比较采用SPSS 13.0软件进行统计学分析,P0.05为差异具有统计学意义。结果:两组图像质量的主观评分无显著差异(P0.05);两组各区域肺动脉CT值的差异均具有统计学意义(P均0.05),SNR、CNR差异均无统计学意义(P均0.05)。常规组和"三低"组的CTDIvol分别为16.9和6.12mGy;DLP分别为(456.84±72.96)和(160.43±27.06)mGy·cm;ED分别为(6.44±1.01)和(2.25±0.38)mSv,两组间上述指标的差异均具有统计学意义(P均0.05)。结论:256层螺旋CT结合idose4迭代重建及"三低"肺动脉成像是可行的,在图像质量满足临床诊断要求前提下,可大幅度降低辐射剂量及对比剂用量。
[Abstract]:Objective: to investigate the feasibility of 256-slice spiral CT combined with idose4 iterative reconstruction and "three low" pulmonary artery imaging (low radiation dose, low concentration contrast agent and low contrast medium dosage). Methods: 80 patients with pulmonary artery CTA and body mass index (BMI) as 18.5~25.0kg/m2 were randomly divided into routine group and "three low" group with 40 cases in each group. The scanning parameters of conventional group were as follows: tube voltage 120kV, tube current 250 mAs, contrast agent concentration 370mg I / mL, contrast agent dose 1.0 mL / kg, and "three low" group scan parameters: tube voltage 100 kV, tube current 150 mAs, contrast agent concentration 270mg I / mL, contrast dose 0.5 mL / kg. The idose4 iterative reconstruction algorithm was used in both groups, and the other scan parameters were the same. The image quality was evaluated by two radiologists with high professional titles according to the unified criteria, and the objective evaluation index of image quality included pulmonary artery CT value. The index of radiation dose evaluation includes average volumetric CT dose index (CTDIvoll), dose length product (DLPN) and effective dose (EDV). Two groups of image quality subjective, objective evaluation results and radiation dose comparison using SPSS 13.0 software for statistical analysis of P0.05 for the difference was statistically significant. Results: there was no significant difference in the subjective score of image quality between the two groups (P 0.05), and there was no significant difference in the CT value of pulmonary artery between the two groups (P 0.05) and no significant difference in CNR between the two groups (P 0.05). The CTDIvol of the routine group and the "three low" group were 16.9 and 6.12 mGy respectively (456.84 卤72.96) and 160.43 卤27.06)mGy / cm ~ (-1) and 2.25 卤0.38 mSv, respectively. The difference of the above indexes between the two groups was statistically significant (P < 0.05). Conclusion it is feasible to combine with idose4 iterative reconstruction and "three low" pulmonary artery imaging. The radiation dose and dosage of contrast agent can be greatly reduced under the condition that the image quality meets the requirement of clinical diagnosis.
【作者单位】：东莞市人民医院放射科;东莞市人民医院放疗科;
【分类号】：R563.5;R816.4

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