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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摘要目的：探讨双能CT迭代重建技术（SAFIRE）联合虚拟平扫（VNE）对评价胃壁图像质量及辐射剂量的影响。方法：50例患者行腹部双能CT扫描，用SAFIRE技术重建动脉期、门脉期图像，后处理得到SAFIRE动脉期、门脉期VNE图像（VNEaS、VNEpS），对真实平扫（TNE）、VNEaS、VNEpS三组图像行主观评价（图像质量评分）及客观评价[CT值、信噪比（SNR）、背景噪声、对比噪声比（CNR）]，记录辐射剂量[容积CT剂量指数（CTDIvol）、有效辐射剂量（ED）]。三组计量资料采用随机区组方差分析，计数资料用Friedman秩和检验，组间两两比较使用Wilcoxon秩和检验；两组计量资料采用配对t检验。结果：三组图像中胃壁、竖脊肌CT值及图像背景噪声差异无统计学意义；肝脏、腹主动脉CT值差异有统计学意义（F值分别为38.40、8.59，P＜0.05），VNEaS、VNEpS高于TNE。胃壁、肝脏、腹主动脉、竖脊肌SNR差异有统计学意义（F值分别为3.70、11.26、42.73、9.05，P＜0.05），TNE高于VNEaS、VNEpS。胃壁-竖脊肌CNR差异有统计学意义（F值为5.03，P＜0.05），TNE、VNEaS高于VNEpS。三组图像质量评分差异有统计学意义（χ2=20.65，P＜0.05），TNE高于VNEaS、VNEpS。TNE、VNE两组CTDIvol、ED差异均有统计学意义（t值分别为-8.03、-6.11，P＜0.05）。常规平扫加增强扫描、双能双期扫描ED分别为（23.79±6.00）、（17.51±4.72）mSv，差异有统计学意义（t值分别为-8.03、17.72，P＜0.05），双能双期扫描ED降低6.28mSv（26.39%）。结论：胃壁动脉期及门脉期SAFIRE技术联合虚拟平扫可替代真实平扫并能降低辐射剂量，且动脉期图像质量优于门脉期。

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关键词 ：胃；体层摄影术, 螺旋计算机；辐射剂量

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

收稿日期: 2018-01-24

PACS:	Ｒ573
	Ｒ814.42

通讯作者: 杨亚英，昆明医科大学第一附属医院放射科，650032。E-mail：yayingyang@163.com

作者简介: 杨泠（1992-），女，云南昭通人，在读硕士。E-mail：1443832806@qq.com

引用本文:

杨泠，瞿姣，袁欣，杨亚英，赵卫. 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[J]. 中国临床医学影像杂志, 2019, 30(1): 61-64.
YANG Ling, QU Jiao, YUAN Xin, YANG Ya-ying, ZHAO Wei. Influence of iterative reconstruction combined with virtual non-enhanced scan on image quality of gastric wall and radiation dose of dual-energy CT. JOURNAL OF CHINA MEDICAL IMAGING, 2019, 30(1): 61-64.

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http://www.jccmi.com.cn/CN/10.12117/jccmi.2019.01.018 或 http://www.jccmi.com.cn/CN/Y2019/V30/I1/61

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