双能CT迭代重建技术联合虚拟平扫对胃壁图像质量及辐射剂量的影响

doi:10.12117/jccmi.2019.01.018

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Abstract Objective: To investigate the influence of iterative reconstruction(SAFIRE) combined with virtual non-enhanced(VNE) scan on image quality of gastric wall and radiation dose of dual-energy CT(DECT). Methods: 50 patients underwent abdominal DECT scan. The SAFIRE images in arterial phase and portal phase were reconstructed. The VNE images(VNEaS, VNEpS) in arterial phase and portal phase were obtained from SAFIRE image post-processing. Subjective evaluation(Image quality score), objective evaluation[CT value, signal to noise ratio (SNR), background noise, contrast noise ratio (CNR)] and radiation dose[volume CT dose index(CTDIvol), effective radiation dose(ED)] of true nonenhanced(TNE), VNEaS and VNEpS images were compared. Statistical analyses were performed using the random block analysis, the Friedman test, the Wilcoxon test and the paired t-test. Results: There were no significant differences in mean CT values and background noise of gastric wall and erector spinae among three groups of images(all P>0.05). The CT values of liver and abdominal aorta in VNEaS and VNEpS images were higher than that in TNE images(all P<0.05). The SNR of gastric wall, liver, abdominal aorta, and erector spinae in TNE images were higher than that in VNEaS and VNEpS images(all P<0.05). The CNR of gastric wall and erector spinae in TNE, VNEaS images were higher than that in VNEpS images(all P<0.05). However, the image quality of VNEaS images was lower than that of TNE images, and was higher than that of VNEpS images. The effective dose for triple-phase was (23.79±6.00)mSv, and that for dual-phase was(17.51±4.72)mSv. The dose saved by removing the TNE was 6.28 mSv (26.39%). Conclussion: The SAFIRE combined with VNE can provide comparable image quality to TNE images in gastric wall scanning, which could reduce patients’ radiation dose as well. The image quality of arterial phase is superior to that of the portal phase.

Key words： Stomach Tomography, spiral computed Radiation dosage

Received: 24 January 2018

PACS:	Ｒ573
	Ｒ814.42

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	Articles by authors
	YANG Ling
	QU Jiao
	YUAN Xin
	YANG Ya-ying
	ZHAO Wei

Cite this article:

YANG Ling,QU Jiao,YUAN Xin, et al. Influence of iterative reconstruction combined with virtual non-enhanced scan on image quality of gastric wall and radiation dose of dual-energy CT[J]. JOURNAL OF CHINA MEDICAL IMAGING, 2019, 30(1): 61-64.

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http://www.jccmi.com.cn/EN/10.12117/jccmi.2019.01.018 OR http://www.jccmi.com.cn/EN/Y2019/V30/I1/61

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