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CT机型与管电压对图像质量影响的体模研究

方姝 陈琳钰 陈勇 董海鹏 王兰 闵佶华

方姝, 陈琳钰, 陈勇, 等. CT机型与管电压对图像质量影响的体模研究[J]. CT理论与应用研究, 2022, 31(3): 345-350. DOI: 10.15953/j.ctta.2021.042
引用本文: 方姝, 陈琳钰, 陈勇, 等. CT机型与管电压对图像质量影响的体模研究[J]. CT理论与应用研究, 2022, 31(3): 345-350. DOI: 10.15953/j.ctta.2021.042
FANG S, CHEN L Y, CHEN Y, et al. Phantom study on the influence of CT model and tube voltage on image quality[J]. CT Theory and Applications, 2022, 31(3): 345-350. DOI: 10.15953/j.ctta.2021.042. (in Chinese)
Citation: FANG S, CHEN L Y, CHEN Y, et al. Phantom study on the influence of CT model and tube voltage on image quality[J]. CT Theory and Applications, 2022, 31(3): 345-350. DOI: 10.15953/j.ctta.2021.042. (in Chinese)

CT机型与管电压对图像质量影响的体模研究

doi: 10.15953/j.ctta.2021.042
详细信息
    作者简介:

    方姝:女,上海交通大学附属瑞金医院放射科技师,主要从事MRI、CT、X-ray等工作,E-mail:fs40914@rjh.com.cn

    闵佶华:男,上海交通大学医学院附属瑞金医院放射科主管技师,主要从事放射技术工作和管理,E-mail:mjh40471@rjh.com.cn

  • 中图分类号: TP  391.4;R  814

Phantom Study on the Influence of CT Model and Tube Voltage on Image Quality

  • 摘要: 目的:使用体模评价两种CT机型两组管电压下的图像质量。方法:采用西门子SOMATOM Force CT和飞利浦IQon Spectral CT分别扫描Catphan500图像质量控制体模的CTP 528和CTP 515组件。对比研究两台机器4组图像,分别为Force120kVp,Force140kVp,IQon120kvp以及IQon140kvp图像;4组图像均为20 mGy剂量。评价指标包括高对比度分辨率[CTP 528最佳线对(1~2 lp/cm)]、低对比度分辨率[CTP 515 1% 浓度下最小孔径(直径2~15 mm)]、图像噪声、对比噪声比(CNR)和信噪比(SNR)。结果:Force120kVp和IQon120kvp两组图像的高对比度分辨率最高(均为6 lp/cm)。4组图像低对比度分辨率相同(最小孔径均为5 mm)。Force120kVp图像噪声最小(2.500±0.000),且SNR最高(30.806±1.398);噪声和SNR在4组图像间差异具有统计学意义。IQon140kvp图像的CNR最高(3.325±0.300),各组图像间差异无统计学意义。结论:不同机型不同管电压下的图像质量存在差异;两台机器120 kVp图像的对比度分辨率略好于140 kVp图像;Force CT的120 kVp图像相比140 kVp图像的图像噪声更小,而IQon Spectral CT的两组图像噪声参数无显著差别。

     

  • 图  1  Force140 kVp图像的Catphan 500体模CTP 528高对比度分辨率和CTP 515低对比度分辨率测量

    Figure  1.  Measurement of CTP 528 high contrast resolution and CTP 515 low contrast resolution of Catphan 500 phantom of Force 140 kVp image

    表  1  四组图像噪声参数组间对比

    Table  1.   Comparison of image noise parameters among the four groups

    噪声参数Force120kVpForce140kVpIQon120kVpIQon140kVp$F $$P $
    SD2.500±0.0002.833±0.2893.400±0.0502.783±0.3518.1530.008
    SNR30.806±1.39829.472±4.42717.040±0.41023.844±2.82315.9050.001
    CNR2.778±0.2412.556±0.4192.604±0.2083.325±0.3004.0650.050
    下载: 导出CSV

    表  2  两名放射科医师的一致性分析结果

    Table  2.   Reliability analysis between the two radiologists

    主客观指标一致性指数P  主客观指标一致性指数P
    高对比度分辨率10.7500.007  CTm20.8570.000
    低对比度分辨率10.7500.007  CTw20.7680.004
    噪声20.6300.028 
    注:1-使用Cohen's Kappa检验;2-使用Spearman相关性分析。
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-11-21
  • 录用日期:  2021-12-23
  • 网络出版日期:  2021-12-28
  • 刊出日期:  2022-05-23

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