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| Application of lower extremity CT angiography with low tube voltage and iterative model reconstruction |
| LIU Bin, GAO Si-zhe, WANG Chuan-zhuo, CHANG Zhi-hui, ZHENG Jia-he |
| Department of Radiology, Shengjing Hospital of China Medical University, Shenyang 110004, China |
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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.
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Received: 31 October 2017
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2018, Vol. 29 
