第3代双源CT对胸部低剂量CT图像质量的影响

发布时间：2018-02-02 01:37

本文关键词： 第代双源CT 肺癌辐射剂量低剂量　出处：《中国医学科学院学报》2017年01期 　论文类型：期刊论文

【摘要】：目的探讨第3代双源CT扫描机全息光子探测器联合基于原始数据的迭代重建算法对胸部低剂量CT(LDCT)扫描剂量和图像质量的影响。方法回顾性分析35例采用第2代双源CT扫描机行LDCT肺癌筛查并于半年至1年后应用第3代双源CT扫描机随诊的患者,比较第2代和第3代双源CT扫描机的扫描剂量和图像质量。结果第2代双源CT的剂量长度乘积和有效剂量分别为(86.37±13.44)m Gy·cm和(1.20±0.42)m Sv,均明显高于第3代双源CT的(49.7±18.2)m Gy·cm(t=6.01,P=0.000)和(0.73±0.26)m Sv(t=6.57,P=0.000)。第2代双源CT筛查时的图像噪声为(25.7±2.9)HU,明显高于第3代双源CT的(18.6±4.2)HU(t=5.24,P=0.000)。第3代双源CT的图像质量评分为(4.80±0.40)分,明显高于第2代双源CT的(4.60±0.49)分(t=4.15,P=0.000)。结论第3代双源CT扫描机通过全息光子探测器,可明显降低辐射剂量,有利于临床肺癌的早期筛查和病变的检出。
[Abstract]:Objective to investigate the effect of the third generation dual-source CT scanner holographic photon detector combined with iterative reconstruction algorithm based on original data on low dose CTLDCT in chest. Methods 35 patients with LDCT lung cancer were screened by the second generation dual-source CT scanner and followed up by the third generation CT scanner from half a year to a year later. The scanning dose and image quality of the second generation and the third generation dual-source CT scanner were compared. Results the dose length product and the effective dose of the second generation dual-source CT were 86.37 卤13.44, respectively. MGy 路cm and 1.20 卤0.42mSv. It was significantly higher than that of the third generation of dual-source CT with 49.7 卤18.2 mGy 路cm(t=6.01. The image noise was 25.7 卤2.9 Hu in the second generation of dual-source CT screening. It was significantly higher than that of the third generation of dual-source CT (18.6 卤4.2). The image quality score of the third generation of dual-source CT was 4.80 卤0.40, and that of the third generation of dual-source CT was 4.80 卤0.40. It is significantly higher than that of the second generation dual-source CT (4.60 卤0.49). Conclusion the third generation dual-source CT scanner passes through the holographic photon detector. It can obviously reduce the radiation dose, and is beneficial to early screening and pathological detection of clinical lung cancer.
【作者单位】：中国医学科学院北京协和医学院北京协和医院放射科;
【基金】：卫生公益性行业科研专项项目(201402013)~~
【分类号】：R734.2;R730.44
【正文快照】： Department of Radiology,PUMC Hospital,CAMS and PUMC,Beijing 100730,ChinaActa Acad Med Sin,2017,39(1):17-20肺癌是我国乃至全球发病率和死亡率最高的恶性肿瘤[1],早期症状缺乏特异性,明确诊断时多已为中晚期,5年生存率低[2]。美国国家肺癌筛查试验研究证实,低剂量CT肺

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