Dependent lung opacity at thin-section CT: Evaluation by spirometrically-gated CT of the influence of lung volume

被引:40
作者
Lee, KN
Yoon, SK
Sohn, CH
Choi, PJ
Webb, WR
机构
[1] Dong A Univ, Coll Med, Dept Diagnost Radiol, Pusan 602103, South Korea
[2] Dong A Univ, Coll Med, Dept Internal Med, Pusan 602103, South Korea
[3] Dong A Univ, Coll Med, Dept Thorac Surg, Pusan 602103, South Korea
[4] Univ Calif San Francisco, Dept Radiol, San Francisco, CA 94143 USA
关键词
lung; collapse; CT; density; function; ventilation;
D O I
10.3348/kjr.2002.3.1.24
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
Objective: To evaluate the influence of lung volume on dependent lung opacity seen at thin-section CT. Materials and Methods: In thirteen healthy volunteers, thin-section CT scans were performed at three levels (upper, mid, and lower portion of the lung) and at different lung volumes (10, 30, 50, and 100% vital capacity), using spirometric gated CT. Using a three-point scale, two radiologists determined whether dependent opacity was present, and estimated its degree. Regional lung attenuation at a level 2 cm above the diaphragm was determined using semiautomatic segmentation, and the diameter of a branch of the right lower posterior basal segmental artery was measured at each different vital capacity. Results: At all three anatomic levels, dependent opacity occurred significantly more often at lower vital capacities (10, 30%) than at 100% vital capacity (p = 0.001). Visually estimated dependent opacity was significantly related to regional lung attenuation (p < 0.0001), which in dependent areas progressively increased as vital capacity decreased (p < 0.0001). The presence of dependent opacity and regional lung attenuation of a dependent area correlated significantly with increased diameter of a segmental arterial branch (r = 0,493 and p = 0.0002; r = 0.486 and p = 0.0003, respectively). Conclusion: Visual estimation and CT measurements of dependent opacity obtained by semiautomatic segmentation are significantly influenced by lung volume and are related to vascular diameter.
引用
收藏
页码:24 / 29
页数:6
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