双层探测器能谱CT单能级成像对门静脉成像质量的影响

doi:10.12117/jccmi.2020.06.012

摘要
图/表
参考文献(16)
相关文章 (15)

全文: PDF (0 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要目的：探索双层探测器能谱CT单能级影像对于门静脉成像质量的影响。方法：使用单源双层探测器能谱CT对39例怀疑腹部疾病的患者行对比增强检查。以3 mL/s的速度注射对比剂iopamidol（320 mg/mL）60 mL后60 s以能谱CT采集方式行门脉期扫描。原始数据被重建成常规120 kVp的混合能量图像及以能谱为基础的数据，获得40，50，60，70 keV的单能级图像。测量常规120 kVp混合能量组以及40，50，60，70 keV的单能级组的图像噪声，门静脉的信噪比（SNR），门静脉与同层竖脊肌相比较的对比噪声比（CNR）。统计方法采用方差分析比较各组之间影像噪声、SNR和CNR，寻找门静脉成像的最佳单能级图像。并对图像质量进行主观评分。结果：各组之间影像噪声、门静脉的SNR、与竖脊肌相比较的CNR有显著的统计学差异（P<0.05）。40 keV组的噪声低于常规120 kVp混合能量组，SNR和CNR远远高于常规120 kVp混合能量组及其他单能量组。主观评分显示40 keV最佳单能级图像质量优于常规混合能量图像质量，两个医师评分的一致性较好。结论：双层探测器能谱CT 40 keV单能级成像显示门脉成像质量最佳。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	王世伟1
	李金锋2
	邹颖1
	李涛2
	罗春材2
	黄自立2
	李雪萍2

关键词 ：门静脉；体层摄影术, X线计算机

Abstract：Objective: To investigate the effect of optimal monochromatic energy image on the image quality of portal venography with dual-layer detector spectral CT. Methods: Thirty-nine patients suspected of abdominal disease underwent contrast-enhanced CT examination using a single-source, dual-detector spectral CT. The portal vein phase scan was performed 60 seconds after 60 mL iopamidol(320 mg/mL) injection at the speed of 3 mL/s. The raw images were reconstructed to obtain polychromatic 120 kVp images and spectral based images. The 40, 50, 60, 70 keV monochromatic images were gotten. Image noise, signal-to-noise ratio(SNR) of portal vein and contrast-to-noise ratio(CNR) of portal vein relative to the erector spine muscle from polychromatic 120 kVp images and 40, 50, 60, 70 keV monochromatic images were measured. Anova test was used to compare the noise, SNR and CNR among 5 groups. An optimal monochromatic image set was chosen for obtaining the best SNR and CNR for portal vein. Image quality was also evaluated on a five-point scale by two radiologists. Results: The difference of noise, SNR, CNR of portal vein among five groups were statistically significant(P<0.05). The noise at 40 keV group was significantly lower than that of polychromatic 120 kVp group. The SNR and CNR of 40 keV group was significantly higher than that of other groups(P<0.05), much higher than that of polychromatic 120 kVp group. The image quality score of 40 keV optimal monochromatic image was superior to that of polychromatic images. The agreement of image quality grading between two doctors was good. Conclusion: 40 keV is the optimal monochromatic image for displaying portal vein using dual-layer detector spectral CT.

Key words： Portal vein Tomography, X-ray computed

收稿日期: 2019-11-11

PACS:	Ｒ331.34
	Ｒ814.42

通讯作者: 李涛，解放军总医院第一医学中心放射科，100853。E-mail：litaofeivip@163.com

作者简介: 王世伟（1986-），男，海南屯昌人，技师。E-mail：404785375@qq.com

引用本文:

王世伟1，李金锋2，邹颖1，李涛2，罗春材2，黄自立2，李雪萍2. 双层探测器能谱CT单能级成像对门静脉成像质量的影响[J]. 中国临床医学影像杂志, 2020, 31(6): 425-428.
WANG Shi-wei1, LI Jin-feng2, ZOU Ying1, LI Tao2, LUO Chun-cai2, HUANG Zi-li2, LI Xue-ping2. Improving image quality in portal venography with dual-layer detector spectral CT imaging. JOURNAL OF CHINA MEDICAL IMAGING, 2020, 31(6): 425-428.

链接本文:

http://www.jccmi.com.cn/CN/10.12117/jccmi.2020.06.012 或 http://www.jccmi.com.cn/CN/Y2020/V31/I6/425

[1]佟梓滨，刘爱莲，刘义军，等. 低浓度对比剂单能量成像对提高肝静脉成像质量的研究[J]. 中国临床医学影像杂志，2015，26（2）：95-104.
[2]Zhao LQ, He W, Li JY, et al. Improving image quality in portal venography with spectral CT imaging[J]. Eur J Radiol, 2012, 81(8): 1677-1681.
[3]Erturk SM, Ichikawa T, Sou H, et al. Effect of duration of contrast material injection on peak enhancement times and values of the aorta, main portal vein, and liver at dynamic MDCT with the dose of contrast medium tailored to patient weight[J]. Clin Radiol, 2008, 63(3): 263-271.
[4]Fleischmann D, Kamaya A. Optimal vascular and parenchymal contrast enhancement: the current state of the art[J]. Radiol Clin North Am, 2009, 47(1): 13-26.
[5]Stenner P, Schmidt B, Allmendinger T, et al. Dynamic iterative beam hardening correction(DIBHC) in myocardial perfusion imaging using contrast-enhanced computed tomography[J]. Invest Radiol, 2010, 45(6): 314-323.
[6]McCollough CH, Leng S, Yu L, et al. Dual- and multi-energy CT: principles, technical approaches, and clinical applications[J]. Radiology, 2015, 276(3): 637-653.
[7]黄瑞岁，丁可，尹华，等. 门脉期能谱CT技术对提高肝硬化门静脉成像质量的研究[J]. 中国临床医学影像杂志，2017，28（5）：341-344.
[8]Manjunatha HC, Rudraswamy B. Study of effective atomic number and electron density for tissues from human organs in the energy range of 1 keV-100 GeV[J]. Health Phys, 2013, 104(2): 158-162.
[9]Albrecht MH, Scholtz JE, Husers K, et al. Advanced image based virtual monoenergetic dual-energy CT angiography of the abdomen: optimization of kiloelectron volt settings to improve image contrast[J]. Eur Radiol, 2016, 26(6): 1863-1870.
[10]Lee JW, Lee G, Lee NK, et al. Effectiveness of Adaptive Statistical Iterative Reconstruction for 64-Slice Dual-Energy Computed Tomography Pulmonary Angiography in Patients With a Reduced Iodine Load: Comparison With Standard Computed Tomography Pulmonary Angiography[J]. J Comput Assist Tomogr, 2016, 40(5): 777-783.
[11]谢德顺，刘爱连，陈丽华，等. 能谱CT低对比剂浓度与低管电压对肝静脉血管成像图像质量影响的研究[J]. 中国临床医学影像杂志，2014，25（11）：772-775.
[12]张龙敏，刘爱连，刘义军，等. 低浓度对比剂能谱ＣＴ单能量成像对提高门静脉图像质量的研究[J]. 放射学实践，2015，30（4）：360-363.
[13]赵晶，徐飞，李晓璐，等. 不同水平的自适应统计迭代重建（ASiR）算法在能谱CT门静脉成像中的图像质量比较[J]. 临床放射学杂志，2016，35（2）：282-287.
[14]Kalisz K, Rassouli N, Dhanantwari A, et al. Noise characteristics of virtual monoenergetic images from a noval detector-based spectral CT scanner[J]. Eur J Radiol, 2018, 98(1): 118-125.
[15]Hokamp NG, Hoink AJ, Doerner J, et al. Assessment of arterially hyper-enhancing liver lesions using virtual monoenergetic images from spectral detector CT: phantom and patient experience[J]. Abdom Radiol, 2018, 43(8): 2066-2074.
[16]Husarik DB, Gordic S, Desbiolles L, et al. Advanced virtual monoenergetic computed tomography of hyperattenuating and hypoattenuating liver lesions[J]. Invest Radiol, 2015, 50(10): 695-702.