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目的探讨呼气相CT上肺内低密度区产生的原因。方法15例正常青年志愿者,年龄21~23岁,平均22岁。在右中肺门区,做仰卧与俯卧位深吸气屏气及深呼气屏气薄层螺旋CT扫描。对仰卧及俯卧位呼吸气相上中肺门区解剖结构相同的层面,进行肺叶面积及密度测量。计算肺叶吸气较呼气面积增加百分率及密度增加值。结果当右下叶处于下垂位,同层面肺叶膨胀性及密度改变均大于非下垂位,肺叶膨胀性与密度变化呈现高度相关(P<0.005)。结论呼气CT上肺内低密度区产生的因素有多种,其中肺内血流变化可直接影响肺密度,同时对肺叶膨胀性也有一定影响。
Objective To explore the causes of low density lung area in exhaled phase CT. Methods 15 normal young volunteers, aged 21 to 23 years, mean 22 years old. In the right hilar area, do supine and prone deep breath-hold breath and deep breath breath thin-slice spiral CT scan. On the supine and prone position respiratory gas phase in the hilar area anatomical structure of the same level of lung area and density measurements. Computed lung inspiratory than the expiratory area increased percentage and density increase. Results When the right lower lobe was in the sagging position, the expansion and density changes of the lobules at the same level were greater than those at the non-sagging position. The lobule expansion and density showed a significant correlation (P <0.005). Conclusion There are many factors that affect the low density lung region in the expiratory CT. Among them, the change of pulmonary blood flow can directly affect the lung density, and also affect the expansibility of the lung lobes.