OBJECTIVE:The objective of our study was to evaluate whether 0.3-second cine CT can be used to detect air trapping in the lungs of young children. SUBJECTS AND METHODS:In 30 children (mean age, 25 months), 0.3-second cine CT was performed at six levels during 3 seconds of quiet breathing. The study population was divided into an air trapping group (n = 24) and a no-air trapping group (n = 6). Lung density was measured at an abnormal area (with or without air trapping) and an adjacent normal area on inspiratory and expiratory phase images. Lung density differences between inspiration and expiration were calculated and compared in abnormal areas (with or without air trapping) and in normal areas. Their percentages were calculated and compared between the two groups. In addition, lung density differences between abnormal and adjacent normal areas were calculated and compared between the two groups. RESULTS:Lung density differences between inspiration and expiration were smaller in areas with air trapping (mean +/- SD, -19 +/- 34 H) than in abnormal areas without air trapping (138 +/- 36 H) (p < 0.001) or in normal areas (111 +/- 49 H) (p < 0.001). Their percentages were smaller in the group with air trapping (-27% +/- 54%) than in the group with no air trapping (120% +/- 87%) (p < 0.001). In the group with air trapping, lung density differences were larger at the expiratory phase (260 +/- 77 H) than at the inspiratory phase (129 +/- 69 H) (p < 0.001), but did not change through the respiratory cycle in the group with no air trapping (p > 0.05). CONCLUSION:Air trapping can be accurately detected in the lungs of free-breathing young children using 0.3-second cine CT.

译文

目的:本研究的目的是评估0.3秒的电影CT是否可用于检测年幼儿童肺部的空气滞留情况。
研究对象和方法:在30名儿童(平均年龄25个月)中,在安静呼吸的3秒内以六个级别进行了0.3秒的电影CT检查。研究人群分为空气诱捕组(n = 24)和无空气诱捕组(n = 6)。在吸气和呼气相位图像上的异常区域(有或没有空气滞留)和相邻的正常区域测量肺密度。计算了吸气和呼气之间的肺密度差异,并在异常区域(有或没有空气滞留)和正常区域中进行了比较。计算他们的百分比,并在两组之间进行比较。此外,计算并比较了正常和邻近正常区域之间的肺密度差异。
结果:有空气滞留的区域(平均/-SD,-19 /-34 H)的吸气和呼气之间的肺密度差异要小于没有空气滞留的异常区域(138 /-36 H)(p <0.001)或在有空气滞留的区域。正常区域(111 /-49 H)(p <0.001)。有空气滞留组的百分比(-27%/-54%)比没有空气滞留组的百分比(120%/-87%)小(p <0.001)。在有空气滞留的组中,呼气阶段(260 /-77 H)的肺密度差异大于吸气阶段(129 /-69 H)的肺密度差异(p <0.001),但在整个呼吸周期中没有变化。没有空气滞留的组(p> 0.05)。
结论:使用0.3秒的电影CT可以准确地检测自由呼吸的幼儿的肺部空气捕获。

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