低管电压联合迭代重建技术对自体上肢动静脉内瘘CTA成像质量及辐射剂量的影响

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Abstract Objective: To study the effect of low-tube voltage (80, 100 kV) combined with the iterative algorithm (IR) on image quality and radiation dose in upper limb intravascular fistula CT angiography. Methods: 72 cases of suspected upper limb arteriovenous fistula (AVF) dysfunction were randomized into 120 kV, 100 kV and 80 kV voltage groups (24 cases per group). The CTA was undertaken with a 320-row scanner (Toshiba Aquilion ONE), and the low tube voltage groups combined with standard adaptive iterative dose reduction technique (AIDR 3D). The states of AVF were observed by using axial images combined with CPR, VR and other reconstruction techniques. The general conditions, vessel density (VD), SNR, CNR, subjective image quality score and radiation dose of the three groups were compared respectively. Results: CTDIvol and DLP in the 100 kV and 80 kV groups were significantly lower than those in the conventional 120 kV group (P<0.05), but the difference between the 100 kV and 80 kV groups was not significant (P>0.05). Combined with the standard iterative reconstruction, VD increased significantly with tube voltage reduction (P<0.05); There was no significant difference in image noise between the 100 kV group and the 120 kV group (P>0.05); When the tube voltage rduced to 80 kV, the image noise increased comparing with the 100 kV and 120 kV groups (P<0.05). SNR and CNR in the 80 kV group were the highest, 67.5% and 78.6% higher than those in the 120 kV group, but the difference between the 80 kV and 100 kV groups was not significant (P>0.05). There was no significant difference in subjective score between the low-tube voltage group and the conventional 120 kV group (P>0.05), and all the three groups had good image quality. Conclusion: Low tube vohage (100 kV) combined with standard IR algorithm can significantly improve the image quality and reduce radiation dose in upper limb intravascular fistula CT angiography. It has certain clinical application value.

Key words： upper limb intravascular fistula CT angiography iterative reconstruction low radiation dose tomography, X-ray computed

Received: 25 June 2018

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	CHEN Yonghua
	FU Gangzhe
	PAN Kehua
	CHEN Cong
	CAO Guoquan

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https://xb.wmu.edu.cn/EN/ OR https://xb.wmu.edu.cn/EN/Y2019/V49/I4/289

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