基于ASIR技术的低管电压MDCT肾动脉成像的可行性研究

发布时间：2018-03-19 15:58

本文选题：肾动脉　切入点：体层摄影术　出处：《临床放射学杂志》2015年01期 　论文类型：期刊论文

【摘要】：目的探讨基于自适应统计迭代重建(ASIR)技术的低管电压MDCT肾动脉成像的可行性。方法将52例肾动脉CT成像患者随机分成A、B两组,每组26例,A组患者采用120 k V管电压,滤波反投影(FBP)重建算法,B组管电压为80 k V,30%ASIR重建算法,管电流均采用250 m A,注射流率4 ml/s,并以相同流率加注生理盐水30 ml。对120 k V组和80 k V组CT图像的客观指标、主观图像质量评分、CT剂量指数(CTDIvol)和剂量长度乘积(DLP)进行比较。结果与A组相比,B组腹主动脉、左侧肾动脉、右侧肾动脉CT值分别升高9.3%、10.7%、9.6%,B组腹主动脉、左侧肾动脉、右侧肾动脉噪声分别增加24.6%、28.2%、24.2%。80 k V组信噪比(SNR)、对比噪声比(CNR)均有所下降。两组腹主动脉、左侧肾动脉、右侧肾动脉CT值、噪声差异均有统计学意义。A组图像质量评分为优、良、差的例数分别为20、6、0,B组图像质量评分为优、良、差的例数分别为16、10、0,两组间图像质量评分差异无统计学意义。A、B两组的CTDIvol分别为12.66、4.00,DLP分别为328.26、103.73。与A组比,B组CTDIvol、DLP下降68.4%。结论基于30%ASIR技术的80 k V管电压MDCT肾动脉成像是可行的,能够在保证图像质量的前提下降低受检者的辐射剂量。
[Abstract]:Objective to investigate the feasibility of low-tube voltage MDCT renal artery imaging based on adaptive statistical iterative reconstruction. Methods 52 patients with renal artery CT imaging were randomly divided into two groups: group A (n = 26) and group A (n = 26) were treated with 120kV tube voltage. Filter backprojection (FBP) reconstruction algorithm: the voltage of B group is 80 kV / 30 ASIR, the tube current is 250 Ma, the injection rate is 4 ml / s, and the same flow rate is injected with normal saline 30 ml. The objective indexes of CT images in 120 kV and 80 kV groups are studied. Results compared with group A, CT dose index (CTDIvoll) and dose length product (DLPP) were compared. Results compared with group A, CT values of abdominal aorta, left renal artery and right renal artery in group B were increased by 9. 3% and 10. 7% respectively. The noise of right renal artery was increased by 24.628.2 and 24.22.80kV, respectively, and the contrast noise was lower than that of CNR.The CT value of abdominal aorta, left renal artery, right renal artery and right renal artery in two groups were statistically significant. The image quality score of group A was excellent and good. The image quality score of group B was excellent and good. The CTDIvol of group A was 12.66 卤4.00. The DLP of group A was 328.26 卤103.730.Conclusion 80 kV tube voltage MDCT renal artery imaging based on 30 ASIR technique is feasible, compared with group A, CTDIvoln DLP of group B is 68.4% lower than that of group A, respectively. It can reduce the radiation dose under the premise of guaranteeing the image quality.
【作者单位】：武汉大学人民医院放射科;
【分类号】：R816.7

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