低管电压结合低对比剂碘量在支气管动脉CT成像的应用

发布时间：2018-02-11 20:43

本文关键词： 支气管动脉体层摄影术 X线计算机辐射剂量迭代重建　出处：《中国医学计算机成像杂志》2017年05期 　论文类型：期刊论文

【摘要】：目的:探讨低管电压、低对比剂碘量和iDose~4迭代重建技术(IR)组合在支气管动脉(BA)CT血管成像的应用价值。方法:选取肺癌或咯血患者80例。随机分为40例行常规剂量即120kV、200mAs行CTA检查,注射对比剂80ml,采用滤波反投影重建法(FBP)进行后处理,标记为A组。40例患者行低剂量为80kV、250mAs进行CTA检查,注射对比剂60ml,采用FBP进行重建者标记为B组、采用iDose~46级进行重建者标记为C组。记录各组的噪声、信噪比、对比度噪声比和有效剂量,按5分评价总体图像质量,并对3组结果进行比较。结果:患者80例均顺利完成检查。所有患者BA的CT值均高于300HU,A、C组MIP和VR支气管动脉重建图像均能满足诊断需要;C组mSv为1.89±0.35,A组mSv为4.40±0.69,有效剂量(ED)显著降低(t=20.518,P0.001),辐射剂量降低约57%,总碘量下降39.2%,碘流率下降18.9%。使用iDose~46级重建的C组主观评分与A组差异无统计学意义(P0.05),SNR、CNR均无统计学差异(P0.05)。结论:低管电压(80kV)+iDose~4+低对比剂碘量联合应用在CTA检查中支气管动脉获得满足诊断要求的图像。
[Abstract]:Objective: to evaluate the application value of low tube voltage, low contrast agent iodine and iDose~4 iterative reconstruction technique in CT angiography of bronchial artery. Methods: 80 patients with lung cancer or hemoptysis were randomly divided into 40 routine doses (120 kV / 200mAs) for CTA examination. A contrast agent of 80 ml was injected and treated with filter backprojection reconstruction (FBP). Group A, 40 patients, underwent CTA examination with low dose of 80kV, 250mAs, 60 ml of contrast agent was injected, and group B was labeled as group B for reconstruction by FBP. Group C was marked by iDose~46 level reconstruction. The noise, signal-to-noise ratio, contrast noise ratio and effective dose of each group were recorded, and the overall image quality was evaluated according to 5 points. Results: 80 patients completed the examination successfully. The CT value of BA in all the patients was higher than that of MIP and VR bronchoarterial reconstruction images in 300HUAZC group. The mSv of group C was 1.89 卤0.35 and the mSv of group A was 4.40 卤0.69, which was effective. The dose of ED2 was significantly lower than that of group A, the radiation dose was decreased by about 57, the total iodine content was decreased by 39.2 and the iodine flow rate was decreased by 18.9.The subjective score of group C with iDose~46 grade reconstruction was not significantly different from that of group A. there was no significant difference between group C and group A (P 0.05). Conclusion: low tube voltage is 80kV) iDose~4. Combined use of low contrast iodine in CTA to obtain images of bronchial arteries that meet the diagnostic requirements.
【作者单位】：柳州市人民医院放射科;
【基金】：广西省卫计委自筹经费科研题(Z20170651)~~
【分类号】：R816.4

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