Garnett E S, Webber C E, Coates G, Cockshott W P, Nahmias C, Lassen N
Can Med Assoc J. 1977 Jan 22;116(2):153-4.
The density of a defined volume of the human lung can be measured in vivo by a new noninvasive technique. A beam of gamma-rays is directed at the lung and, by measuring the scattered gamma-rays, lung density is calculated. The density in the lower lobe of the right lung in normal man during quiet breathing in the sitting position ranged from 0.25 to 0.37 g.cm-3. Subnormal values were found in patients with emphsema. In patients with pulmonary congestion and edema, lung density values ranged from 0.33 to 0.93 g.cm-3. The lung density measurement correlated well with the findings in chest radiographs but the lung density values were more sensitive indices. This was particularly evident in serial observations of individual patients.
通过一种新的非侵入性技术可以在体内测量人体肺部特定体积的密度。一束伽马射线射向肺部，通过测量散射的伽马射线来计算肺部密度。正常男性在坐位安静呼吸时右肺下叶的密度范围为0.25至0.37克/立方厘米。在肺气肿患者中发现密度值低于正常。在肺充血和水肿患者中，肺部密度值范围为0.33至0.93克/立方厘米。肺部密度测量与胸部X光片的结果相关性良好，但肺部密度值是更敏感的指标。这在对个体患者的连续观察中尤为明显。
