宝石能谱单能量成像及自适应统计迭代重建技术在腹部低剂量CT扫描中的可行性研究

发布时间：2018-04-27 05:34

  本文选题：体层摄影术 + X线计算机　； 参考：《放射学实践》2017年04期

【摘要】：目的:探讨在腹部低剂量CT扫描中使用宝石能谱单能量成像(GSI)结合自适应统计迭代重建技术的成像质量。方法:90例患者使用GE Discovery CT750HD 64排CT机行腹部CT平扫及双期增强扫描。实验组A(30例)采用GSI技术(60keV+ASIR 50%)+对比剂碘剂量450mg I/kg;实验组B(30例)采用常规扫描(120kVp)+对比剂碘剂量300mg I/kg;对照组(30例)行常规扫描(120kVp)+对比剂碘剂量450mg I/kg。每组均测量腹部大血管(动脉期/静脉期)、脏器和肌肉(三期)共26个ROI的CT值并计算相应的SNR,使用5分法(Likert分级)对各部位的图像质量进行主观评价。结果:三组患者的年龄、身高、体重及身体质量指数(BMI)间的差异均无统计学意义(P0.05)。A组中26个ROI的CT值均高于对照组,除平扫和动脉期肝脏CT值和平扫肌肉CT值外,其它23个ROI的CT值在两组间的差异均有统计学意义(P0.05)。B组各ROI的CT值均低于对照组,但差异无统计学意义(P0.05)。A组中(除SMA外)各ROI的SNR均高于对照组,仅门脉左支、动脉期肝和脾、平扫和静脉期胰腺的SNR在两组间的差异无统计学意义(P0.05)。B组的SNR均低于对照组,但差异无统计学意义(P0.05)。主观评价方面,三组间图像质量评分的差异无统计学意义(P0.05)。A组与对照组间辐射剂量的差异有统计学意义(P0.001);B组对比剂剂量与对照组间的差异有统计学意义(P0.001)。结论:在能谱CT成像结合ASIR技术的帮助下,使用低管电压能得到较好的腹部CT图像质量。
[Abstract]:Objective: to investigate the imaging quality of gemstone energy spectrum single energy imaging (GSI) combined with adaptive statistical iterative reconstruction in abdominal low dose CT scanning. Methods 90 patients were examined with GE Discovery CT750HD 64 slice CT and dual phase enhanced CT scan. The experimental group (30 cases) were treated with GSI (60 Kev ASIR 50) iodine dose (450mg I / kg); the experimental group (n = 30) with routine scanning method (n = 30) with 300mg I / kg; the control group (n = 30) with routine scan (n = 30); the control group (n = 30); with routine scanning (n = 120 KVp); with iodine dose of 450mg / KG (n = 30). In each group, the CT values of 26 ROI of abdominal great vessels (arterial / venous phase, viscera and muscle (phase 3) were measured and the corresponding ROI were calculated. The image quality of each site was evaluated by 5 points method. Results: there was no significant difference in age, height, weight and BMI between the three groups. The CT values of 26 ROI in group A were higher than those in control group. The CT values of the other 23 ROI were significantly different between the two groups. The CT values of each ROI in group B were lower than those in the control group, but the SNR of each ROI in group A (except SMA) was higher than that in group A, only left portal vein, liver and spleen in arterial phase. There was no significant difference in SNR between the two groups in plain scan and venous phase. The SNR of group B was lower than that of control group, but there was no significant difference between group B and group B (P 0.05). In subjective evaluation, there was no significant difference in image quality score among the three groups. There was significant difference in radiation dose between group A and control group. There was significant difference in dose of contrast agent between group P0.001 and control group (P 0.001). Conclusion: with the help of energy dispersive CT imaging and ASIR technique, better abdominal CT image quality can be obtained by using low tube voltage.
【作者单位】： 国家癌症中心/中国医学科学院北京协和医学院肿瘤医院影像诊断科;
【基金】：北京协和医学院2015年研究生创新基金(2015-1002-01-26)
【分类号】：R816.5
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本文编号：1809433