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全模型迭代重建技术联合低管电压MSCT扫描在肾动脉成像中的应用研究 被引量:9

A Study of the Application of Iterative Model Reconstruction Combined with Low Tube Voltage MSCT in Renal Artery CT Angiography
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摘要 目的探讨全模型迭代重建(IMR)技术联合低管电压MSCT扫描在肾动脉成像中降低辐射剂量及控制图像质量的应用价值。方法前瞻性连续搜集行腹盆腔动态增强CT扫描的120例患者,根据患者体质量指数(BMI)分为A组(BMI≤22kg/m^2)、B组(22kg/m^2〈BMI≤25kg/m^2)两组,再根据管电压及重建算法不同各分出3个亚组,A1-FBP组(120kV,FBP),A2-iDose。组(80kV,iDose^4),A2-IMR组(80kV,IMR);B1-FBP组(120kV,FBP),B2-iDose^4组(100kV,iDose^4),B2-IMR组(100kV,IMR)。测量各组肾动脉主干CT值,分别对各组肾动脉MIP图像质量进行评分,记录各组容积CT剂量指数(CTDIv01)、剂量长度乘积(DLP),计算各组信噪比(SNR)、对比噪声比(CNR)、用碘总量、图像灵敏度(FOM)及有效剂量(ED)。A1与A2,B1与B2用碘总量、DLP、ED比较使用独立样本t检验;A、B两组的3个亚组间(A1.FBP、A2-iDose。与A2-IMR,B1-FBP、B2-iDose^4与B2.IMR)肾动脉主干CT值、SNR、CNR、FOM比较使用单因素方差分析;肾动脉图像质量评分的比较采用秩和检验。结果A1与A2组CTDIvol、DLP及ED分别为16.9mGy、(886.1±46.0)mGy·cm、(13.3±0.7)roSy;4.9mCy、(261.9±12.5)mGy·cm、(3.9±0.2)mSv。B1与B2组上述数据分别为16.9mGy、(929.6±45.3)mGy·cm、(14.0±0.7)mSv;10.1mGy、(559.9±26.4)mGy·cm、(8.4±0.4)mSv。组间上述数据差异有统计学意义(P〈0.01)。A1-FBP、A2-iDose。与A2-IMR组SNR、CNR、FOM及图像质量评分分别为10.1±3.0、13.2±3.5、(11.0±5.9)mGy^-1、3.0(2.0,3.0):14.5±4.1、15.6±3.9、(52.5±26.8)mGy^-1、3.0(2.0,3.0);34.9±13.3、44.4±12.2、(339.3±237.8)mGy^-1、3.0(3.0,4.0)。B1-FBP、B2-iDose^4与B2-IMR组上述数据分别为9.0±2.4、9.7±2.7、(6.0±3.7)mGy^- Objective To evaluate the application of iterative model reconstruction(IMR) combined with low tube voltage MSCT for reducing radiation dose and controlling image quality in renal artery CT angiography(CTA).Methods120 cases of abdominal and pelvic enhancement CT scans were prospectively and continuously collected in our hospital and they were divided into Group A(BMI≤22 kg/m~2) and Group B(22 kg/m~2 BMI≤25 kg/m~2) according to the patient's BMI.They were then further divided into 3 subordinate groups according to different tube voltages and reconstruction algorithms.The groups were divided as follows: Group A1-FBP((120 k V,FBP; Group A2-iDose~4(80 k V,iDose~4); Group A2-IMR(80 k V,IMR) and Group B1-FBP((120 k V,FBP); Group B2-iDose~4(100 k V,iDose~4); Group B2-IMR(100 k V,IMR).We measured each group's renal artery CT value,graded each group's renal artery MIP image quality,recorded each group's CTDIvol,dose length product(DLP),calculated each group's signal noise ratio(SNR),contrast noise ratio(CNR),iodine consumption amount,figure of merit(FOM) and effective dose(ED).We compared the iodine consumption amount,DLP,ED of A1A2,B1B2 with independent-sample t test.We also compared the renal artery CT value,SNR,CNR,FOM of Group A and Group B's three subordinate groups(A1-FBP,A2-iDose~4 and A2-IMR; B1-FBP,B2-iDose~4 and B2-IMR) with one-way analysis of variance.Lastly,we compared the renal artery image quality with rank sum test.Results The CTDIvol,DLP and ED of Group A1 and Group A2 were 16.9m Gy,(886.1 ± 46.0) m Gy · cm,(13.3 ± 0.7) m Sv; 4.9m Gy,(261.9 ± 12.5) m Gy·cm,(3.9 ± 0.2) m Sv respectively.The data mentioned above for Group B1 and Group B2 were 16.9m Gy and(929.6 ± 45.3) m Gy·cm,(14.0 ± 0.7) m Sv; 10.1m Gy、(559.9 ± 26.4)m Gy·cm and(8.4 ± 0.4) m Sv respectively.The difference of the data mentioned above among groups had statistic significance(P 0.01).The SNR,CNR,FOM and image qu
作者 窦欣 龚建平 张伟 蔡武 陈光强 朱建兵 乔方 DOU Xin, GONG Jianping,ZHANG Wei, et al. (Department of Radiology, the Second Affiliated Hospital of Soochow University, Suzhou, Jiangsu Province 215004,P. R. China)
出处 《临床放射学杂志》 CSCD 北大核心 2017年第4期566-570,共5页 Journal of Clinical Radiology
基金 苏州市科技发展计划指导项目(编号:SYSD2016088)
关键词 肾动脉 图像处理 计算机辅助 体层摄影术 X线计算机 辐射剂量 Renal artery Imaging processing computer assisted Tomography X-ray computed Radiation dosage
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