双源CT肺动脉成像双能量与单能量扫描的图像质量及辐射剂量

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Abstract Objective: To evaluate image quality and radiation dose of dual-energy scanning protocol and conventional scanning protocol(single-energy scanning) with dual-source CT in pulmonary angiography and to investigate the optimal scanning protocols of dual-source CT pulmonary angiography. Methods: Two hundred and thirty-five patients with clinically suspected pulmonary embolism underwent flash dual-source CT pulmonary angiography were collected, and divided into three groups: group A(DE, 80/Sn140 kV)(n=77); group B(DE, 100/Sn140 kV)(n=80); group C(tube voltage was selected automatically by Care kV)(n=78). The CT attenuation values of pulmonary arteries(grade 1～3) and dorsal muscle, and background noise were measured. Corresponding signal to noise ratio(SNR) and contrast to noise ratio(CNR) were calculated. Meanwhile, two experienced radiologists assessed the image quality of the three groups. Image quality and radiation exposure were compared between groups, and P<0.05 was considered statistically significant. Results: CT attenuation values in bilateral upper lobe pulmonary artery have no difference significantly(P>0.05) between group A and group B/C. The value of the group B was lower than that of in group C(P<0.05), there was no significant difference(P>0.05) in others compares. Compared to the other of two groups, image noise in group A were higher than others, and while its corresponding CNR and SNR for all measured pulmonary arteries were lower than others group(P<0.05). The image quality meet the diagnostic requirements for pulmonary embolism in all groups, and the image quality score of three groups has no statistically significant difference(P>0.05) with good interobserver agreement. The image quality with good to excellent(1～2 score) grade of all subjective was more than 90%, and no significantly difference was between the groups(P>0.05). The values of CTDIvol, DLP, and ED were significantly lower in group A than that in group B and group C(P＜0.05), and the mean ED values of group A was lower 46.8% than that of group C. Conclusion: Compared with conventional scanning protocol in dual-source CTPA, the dual-energy scanning protocol (80/Sn140 kV) with the diagnostic image quality allows a significant radiation dose reductions.

Key words： Pulmonary artery Radiation dosage Tomography, X-ray computed

Received: 31 May 2016

PACS:
	Ｒ322.121
	Ｒ814.42

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	Articles by authors
	LUO Xian-li
	LI Bang-guo
	LIU Pan
	SUN Hui
	HUANG Ting-ting
	WANG Meng
	ZHANG Xue-mei

Cite this article:

LUO Xian-li,LI Bang-guo,LIU Pan, et al. Image quality and radiation dose of dual-energy scanning and single-energy scanning with#br# dual-source CT in pulmonary angiography[J]. JOURNAL OF CHINA MEDICAL IMAGING, 2017, 28(2): 140-144.

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http://www.jccmi.com.cn/EN/ OR http://www.jccmi.com.cn/EN/Y2017/V28/I2/140

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