摘要
为探讨定量 CT肺密度测定的影响因素 ,对 5 4例正常人在 5 0 %肺活量 (VC)时螺旋 CT扫描全肺 ,其中 40例在 10 % VC、 90 % VC,2 3例在 5 0 % VC呼吸水平于隆突层、隆突上下各 5 cm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 12 5 .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。
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.
出处
《同济医科大学学报》
CAS
CSCD
北大核心
2001年第1期80-82,共3页
Acta Universitatis Medicinae Tongji
基金
卫生部科研基金资助项目 (No.98- 2 - 0 93)
关键词
肺密度
CT
测定
肺疫病
诊断
lung density
tomography, X ray computed
