| 梁志梅,夏振元,莫欣鑫,黄卫庆,李伟雄.全模型迭代重建用于CT-Ⅲ、Ⅳ级肝硬化患者低剂量CT门静脉成像[J].中国医学影像技术,2021,37(2):245~249 |
| 全模型迭代重建用于CT-Ⅲ、Ⅳ级肝硬化患者低剂量CT门静脉成像 |
| Iterative model reconstruction in low-dose CT portal venography of liver cirrhosis patients with CT-Ⅲ and Ⅳ grading |
| 投稿时间：2020-11-10 修订日期：2020-12-11 |
| DOI：10.13929/j.issn.1003-3289.2021.02.019 |
| 中文关键词: 肝硬化 体层摄影技术,X线计算机 低剂量 全模型迭代重建 |
| 英文关键词:liver cirrhosis tomography, X-ray computed low dose iterative model reconstruction |
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| 中文摘要: |
| 目的 观察采用全模型迭代重建（IMR）技术联合80 kV管电压进行CT-Ⅲ、Ⅳ级肝硬化患者CT门静脉成像（CTPV）的可行性。方法 将80例CT-Ⅲ、Ⅳ级肝硬化患者随机分为试验组（40例）和对照组（40例）。试验组采用管电压80 kV，剂量指数（DRI）17，以IMR技术重建；对照组管电压100 kV，DRI 19，采用iDose4算法重建。对比2组图像的主观评分、客观评价指标及辐射剂量的差异。结果 试验组肝实质及门静脉噪声值均低于、信噪比（SNR）及对比信噪比（CNR）均高于对照组（P均<0.01）；试验组门静脉主观评分高于对照组（P<0.01）。2组肝实质主观评分结果差异无统计学意义（P>0.05）。试验组容积CT剂量指数（CTDIVOL）、剂量长度乘积（DLP）及有效剂量（ED）分别为（6.28±1.38） mGy、（134.48±34.79） mGy·cm和（2.29±0.59） mSv，相比对照组减低各27.5%、27.8%及27.8%。结论 IMR技术联合低管电压可提高CT-Ⅲ、Ⅳ级肝硬化患者CTPV图像质量，并减少ED。 |
| 英文摘要: |
| Objective To observe the feasibility of using iterative model reconstruction (IMR) combined with 80 kV tube voltage in low-dose CT portal venography (CTPV) of cirrhosis patients with CT-Ⅲ and Ⅳ grading. Methods A total of 80 patients with liver cirrhosis were enrolled. The patients were randomly divided into study group and control group (each n=40). Patients in study group underwent CTPV with tube voltage 80 kV, dose right index (DRI) 17 and reconstructed with IMR techniques, while those in control group underwent CTPV with tube voltage 100 kV, DRI 20 and reconstructed with iDose4 techniques. The subjective scorings, objective evaluation indexes and radiation dose indexes were compared between groups. Results The image noise of liver and portal vein in study group were all significantly lower than control group, while the signal noise ratio (SNR) and contrast noise ratio (CNR) were significantly higher (both P<0.01). The subjective scorings of portal vein in study group were significantly higher than in control group (P<0.01), while no significant difference of subjective scorings of liver parenchyma was found between groups (P>0.05). The volume CT dose index (CTDIVOL), dose length product (DLP) and effective dose (ED) of study group were (6.28±1.38) mGy, (134.48±34.79) mGy·cm and (2.29±0.59) mSv, respectively, significantly lower than those of control group (mGy, mGy·cm, mSv, all P<0.01) and reduced by 27.5%, 27.8% and 27.8%,respectively. Conclusion IMR techniques combined low tube voltage could improve imaging quality of CTPV and decrease ED in liver cirrhosis patients with CT-Ⅲ and Ⅳ grading. |
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