低管电压联合全模型迭代重建技术在下肢动脉CTA中的应用

doi:10.12117/jccmi.2018.09.014

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摘要目的：探讨低管电压联合全模型迭代重建技术在下肢动脉CTA检查中的应用价值。方法：收集我院行下肢动脉CTA检查的患者44例，随机分为2组，每组22例。两组均采用管电流自动调制技术，A组（实验组）管电压采用80 kVp，造影剂75 mL，注射速率3 mL/s，使用全模型迭代重建技术；B组（对照组）管电压采用120 kVp，造影剂100 mL，注射速率4 mL/s，使用滤波反投影重建技术。测量腹主动脉分叉、股总动脉、股浅动脉中段、腘动脉近端及胫腓干的CT值和图像噪声，计算各部位信噪比和对比噪声比；同时对图像质量进行主观评分,记录容积CT剂量指数及剂量长度乘积；对两组间测量结果和主观评分进行统计学分析。结果：A组血管腔平均CT值明显高于B组（P均<0.01），信噪比和对比噪声比较B组均明显增加（P均<0.01）；A组和B组图像的主观评分无统计学差异（P>0.05），均满足临床诊断；A组的容积CT剂量指数及剂量长度乘积与B组相比明显减少（P均<0.01），A组碘负荷与B组相比减少25%。结论：应用低管电压扫描联合IMR重建技术，能够获得良好的下肢动脉CTA图像，同时明显降低辐射剂量和碘负荷。

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	刘彬
	高思喆
	王传卓
	畅智慧
	郑加贺

关键词 ：动脉, 下肢, 体层摄影术, 螺旋计算机, 血管造影术

Abstract：Objective: To investigate the application value of low tube voltage in combination with iterative model reconstruction(IMR) in lower extremity CT angiography(CTA). Methods: Forty-four patients were randomly divided into experimental group(n=22) and control group(n=22). All the patients underwent CTA with　automatic tube current modulation. The patients in experimental group(group A) were scanned with 80 kVp tube voltage, 75 mL of contrast agent, flow rate at 3 mL/s and IMR. The patients in control group(group B) were scanned with 120 kVp, 100 mL of contrast agent, flow rate at 4 mL/s, and filtered back projection(FBP). CT values of vessel were measured on bilateral lower extremity arteries of the axial images, including aortic bifurcation, common femoral artery, middle superficial femoral，proximal popliteal artery and tibiofibular trunk artery. The standard deviation(SD) of CT value of vessel lumen was defined as image noise. The SNR and CNR were calculated. The subjective image quality was scored. The results of CT volume dose index(CTDIvol) and dose length product(DLP) were recorded. Results: The CT values、SNR and CNR were higher in group A than group B(P<0.01). There was no difference in subjective image quality between the two groups(P>0.05). The CTDIvol and DLP of group A were lower than that of group B(P<0.01). Compared with group B, the iodine load decreased by 25%. Conclusions: Lower extremity CTA with low tube voltage and IMR can provide good image quality for clinical diagnosis with a significant reduction in radiation dose and the iodine load.

Key words： Arteries Lower extremity Tomography, spiral computed Angiography

收稿日期: 2017-10-31

PACS:	Ｒ543.5
	Ｒ814.42
	Ｒ814.43

通讯作者: 郑加贺，中国医科大学附属盛京医院放射科，110004。E-mail：zhengjh@sj-hospital.org

作者简介: 刘彬（1993-），女，湖南常德人，在读硕士研究生。E-mail：834697141@qq.com

引用本文:

刘彬，高思喆，王传卓，畅智慧，郑加贺. 低管电压联合全模型迭代重建技术在下肢动脉CTA中的应用[J]. 中国临床医学影像杂志, 2018, 29(9): 660-663.
LIU Bin, GAO Si-zhe, WANG Chuan-zhuo, CHANG Zhi-hui, ZHENG Jia-he. Application of lower extremity CT angiography with low tube voltage and iterative model reconstruction. JOURNAL OF CHINA MEDICAL IMAGING, 2018, 29(9): 660-663.

链接本文:

http://www.jccmi.com.cn/CN/10.12117/jccmi.2018.09.014 或 http://www.jccmi.com.cn/CN/Y2018/V29/I9/660

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