| 定量CT肺密度测定的影响因素 |
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| 引用本文： | 刘芳,韩萍,冯敢生.定量CT肺密度测定的影响因素[J].华中科技大学学报(医学版),2001,30(1):80-82. |
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| 作者姓名： | 刘芳 韩萍 冯敢生 |
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| 作者单位： | 华中科技大学同济医学院附属协和医院放射科, |
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| 基金项目： | 卫生部科研基金资助项目(No. 98-2-093) |
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| 摘 要： | 为探讨定量CT肺密度测定的影响因素，对54例正常人在50%肺活量（VC）时螺旋CT扫描全肺，其中40例在10%VC、90%VC，23例在50%VC呼吸水平于隆突层、隆突上下各5cm处行高分辨CT（HRCT）扫描，用Pulmo软件自动评估平均肺密度（ME）和像素指数（PI）。发现呼吸幅度对ME、PI影响很大，吸呼气末ME差值达125.91Hu。ME和PI还受层厚、年龄、性别的影响。结果表明精确控制呼吸水平对定量CT肺密度测定极其重要，扫描时要保证技术条件一致，有必要建立正常国人不同性别、年龄的肺密度参考值。
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| 关 键 词： | 肺密度 断层摄影术，X线计算机 |
| 修稿时间： | 2000年6月16日 |
The Factors Influencing Quantitative Measurement of CT Lung Densitometry |
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| Liu Fang,Han Ping,Feng Gansheng.The Factors Influencing Quantitative Measurement of CT Lung Densitometry[J].Journal of Huazhong University of Science and Technology(Health Sciences),2001,30(1):80-82. |
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| Authors: | Liu Fang Han Ping Feng Gansheng |
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| Institution: | Liu Fang,Han Ping,Feng Gansheng Department of Radiology,The Affiliated Xiehe Hospital,Tongji Medical College of Huazhong University of Science and Technology,Wuhan 430022 |
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| Abstract: | In order to study the factors influencing quantitative measurement of CT lung densitometry, 54 healthy adults underwent lung spiral scans at 50 % vital capacity (VC). Among the 54 cases, 40 received HRCT scan at carina and 5 cm away from carina (± 5 cm) at 10 % VC and 90 % VC, 23 lung HRCT at those three sections at 50 % VC. Using automatic evaluation software-Pulmo, mean lung density (ME) and pixel index (PI) at each section were evaluated. It was found that the depth of respiration affected ME and PI markedly. The ME changed 125.91 Hu between 10 % VC to 90 % VC. The ME and PI were also influenced by collimation, age and sex. It was concluded that it was very important to control the depth of respiratory. The normal CT attenuation values for the lung should be established. |
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| Keywords: | lung density tomography X ray computed |
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