摘要目的了解定量CT测定肺通气功能的可能性.材料与方法对30例正常人行呼吸门控下螺旋CT扫描.CT扫描在50% VC水平,以8mm层厚进行.应用评估软件测定肺密度(平均CT值)及像素在各区间出现的频率(像素指数,PI).结果各像素区间PI存在显著性差异.结论螺旋CT结合呼吸门控和自动化评估软件测定肺密度及PI是一项精确、重复性高、耐受性好的方法,有预示肺通气功能的可能性.

abstractsObjective To assess the possibility of using spirometrically controlled computed tomography (CT) to test pulmonary ventilation function.Methods Spiral CT scans under the control of a spirometer were performed on 30 healthy a dults. Spiral CT scan was performed at 50% vital capacity (VC) with an 8 mmslice thickness. Mean attenuation values and pixel index (PI) of lung regions we re evaluated with semiautomatic evaluation software. Results There were significant differences in PI values between four pixel intervals.Conclusions Spirometrically controlled spiral CT with semiautomatic evaluation software is an accurate and reproducible method of measuring lung density and PI, which has the possibility of indicating pulmonary ventilation function.