自适应迭代重建算法在低对比剂肾动脉CTA扫描中的应用

doi:10.12117/jccmi.2018.10.008

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Abstract Objective: To evaluate the application value of adaptive statistical iterative reconstruction(ASIR) in reducing the dosage of CTA contrast agent in renal artery. Methods: Forty patients with renal artery CTA were randomly divided into two groups: routine group 20 cases(group A) with 600 mgI/kg and low contrast medium dose group 20 cases(group B) with 300 mgI/kg. The scan protocol was: Discovery CT750HD, smart mA, noise index of 10 HU, pitch 1.375:1, rotating speed 0.6 s/r. Images of the artery phase were reconstructed at 0.625 mm thickness with 40%ASIR, group A reconstructed monochromatic images at 70 keV, group B reconstructed monochromatic images from 40～70 keV by interval 5 keV. The CT values and standard deviation(SD) values of the renal artery in plain scan(CT1, SD1) and the arterial phase(CT2, SD2), and the erector muscle of spine in the arterial phase(CT3, SD3) were measured. The enhancement degree of the renal artery(ΔCT=CT2-CT1), the signal to noise ratio(SNR=CT2/SD2) and contrast to noise ratio(CNR=(CT2-CT3)/SD3) were calculated. Single factor analysis of variance was used. The subjective image scores of the groups were assessed blindly by two experienced physicians using a 5-point system and the score consistency was compared by the Kappa test. Results: The subjective scores of the 600 mgI/kg 70 keV group and the 300 mgI/kg 45 keV group were 3.90±0.55 and 4.00±0.65, 3.55±0.83 and 3.70±0.80, and the difference was not statistically significant(P>0.05), and there was no significant difference in the objective parameters(ΔCT, SNR and CNR)(P>0.05). Conclusion: When the dosage of contrast medium is reduced by 50%, the ASIR can get the image quality satisfying the diagnosis in the renal artery CTA.

Key words： Renal artery Tomography, X-ray computed

Received: 14 November 2017

PACS:	Ｒ692.16
	Ｒ814.42

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	Articles by authors
	GUO Chang-yi1
	HAN Dong2
	YANG Chuang-bo2
	LEI Yu-xin2
	HE Tai-ping2
	ZHANG Xi-rong3

Cite this article:

GUO Chang-yi1,HAN Dong2,YANG Chuang-bo2, et al. Application of adaptive statistical iterative reconstruction in renal CTA with low-dose contrast medium[J]. JOURNAL OF CHINA MEDICAL IMAGING, 2018, 29(10): 713-716.

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http://www.jccmi.com.cn/EN/10.12117/jccmi.2018.10.008 OR http://www.jccmi.com.cn/EN/Y2018/V29/I10/713

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