利用肺脏模型评价CT测量胸腔积液量准确性的研究  

Accuracy of Hydrothorax Volume Measurement by CT's Volume Measuring Function

作　　者：黄科峰[1] 赵国宏[1] 姚竑[1] 韩金安[1] 曾社平[1] 王海军[1] 张昌庆[1] 宋君[1] 

机构地区：[1]解放军第477医院放射科,湖北襄樊441021

出　　处：《临床军医杂志》2007年第5期680-682,共3页Clinical Journal of Medical Officers

摘　　要：目的评价CT测算胸腔积液量的准确性。方法（1）采用GE—sytee4000i全身CT扫描系统，对注水肺脏模型进行扫描，选取右侧肺脏共作15次测量。（2）由一名熟练的CT操作人员在积液最明显的一层上用轨迹手工圈划出积液的完整轮廓，预设感兴趣区的CT值上下限范围0～20Hu，采用计算机体积测算功能，计算出各层满足上述要求的感兴趣区图像总体积。结果肺脏模型体积CT测值与实际注水量关系呈直线趋势，R^2=1、000。回归系数t检验的t值=681、077，P=O、0001（P〈0．001），故可认为肺脏模型体积CT测值与实际注水量之间有直线关系；直线回归方程为：Y=-0、238＋0、999X。肺脏模型体积的标准差为893．27504，实际注水量的标准差为894．42719。肺脏模型体积CT测值与实际注水量的相关分析表明，肺脏模型体积CT测值与实际注水量高度相关。结论CT能够准确测量胸腔积液量，它可替代传统X线的粗略估算，是胸腔积液测算的客观准确方法。Objective To evaluate the accuracy of hydrothorax volume by computerized tomography （CT）. Methods （ 1 ） Waterperfused lung model was scanned by systemic CT scantling （GE-sytcc4000i） , which mcasured the right lung of the model for 15 times. （2） A skilled CT operator drew the whole contour line on the layer with the clearest hydrothorax with manual tracks. The preatTanged interesting area CT value＇ s upper and lower limit was 0 20 Hu. The total interesting area imaging volume was calculated using the computer＇ s volume measuring function, Results A lineat trend existed between the lung model＇ s CT volume value and the actually perfusing volume＇ s scatterplot （ R2 = 1. 000 ） , which indicated a linear correlation with a 681. 077 of t value in regression coefficient t test （ P = 0. 000 1, P 〈 0. 001 ; regression equation ： Y = - 0. 238 ＋ 0. 999X ）. The standard deviation was 893. 275 04 （ lung model volume） or 894. 427 19 （ actually perfusing volume）. The correlation analysis between the lung model＇ s CT volume value and the actually perfusing volume suggested that they were highly correlative, i.e. there was no significant difference （ P 〈 0. 001 ）. Conclusion The volume of hydrothorax can be accurately measured by CT which may replace traditional X-ray rough estimation.

关 键 词：X线计算机断层扫描 胸腔积液 肺脏模型 

分 类 号：R445[医药卫生—影像医学与核医学] R561[医药卫生—诊断学]