Pulmorary function test using helical CT

我们开发了使用胸部计算机体层摄影(CT)的肺功能测试。以往的常规CT研究表明，A200的CT值在-1024~-200HU之间，A910的CT值在-1024~-920HU之间表示大泡性改变的总体积。EVV(A200-A910)和IVR(A910/A200)也显示了CT肺部检查的附加信息。常规CT的这些因素也可应用于螺旋CT的因素。对32例肺癌患者常规肺功能测定与CT肺功能测定的肺功能进行了比较。A910与FEV1.0、A200与VC呈正相关(P=0.032)。A910与%FEV1.0(p=0.0118)、IVR与V50(p=0.0227)也有相关性。螺旋CT肺功能检查比常规CT检查时间短(110min比12min)，并以3D图形显示靶区。比较SPECT肺功能与CT肺功能显像的异同。A200与SPECT、IVR、SPECT有一定的相关性(P=0.053.0 5)。CT肺功能检查有肺功能的附加信息。

We developed pulmonary function test using chest computed tomogram (CT). Previous study using conventional CT showed that CT value form -1024 to -200 HU as A200 indicated total lung volume and CT value from -1024 to -920 HU as A910 indicated total volume of bullous change. EVV (A200-A910) and IVR (A910/A200) also showed an additional information of CT pulmonary test. We also showed these factors by conventional CT could apply to factors by helical CT. Comparison of pulmonary function between spirometry as conventional pulmonary function test and CT pulmonary function test was evaluated in 32 lung cancer cases. Correlation between A910 and FEV1.0, A200 and VC was found (P=0.032). Correlation between A910 and %FEV1.0 (p=0.0118), IVR and V50 (p=0.0227) was also found. Helical CT pulmonary function test provided shorter examination time than conventional CT test (110 minutes vs. 12 minutes) and showed target area as 3D graphics. Comparison of ventilation-perfusion scintigram using SPECT and CT pulmonary function test was evaluated. A little correlation between A200 and SPECT (p=0.053), IVR and SPECT (p=0.05) was found. CT pulmonary function test had additional information of pulmonary function.