Abstract:
:The authors examined 10 healthy male subjects with dynamic computed tomography to determine normal dynamic and expiratory findings. In both the supine and prone positions, the average increase in lung attenuation during exhalation was found to be significantly greater in dependent lung regions than in nondependent lung regions. In each of the lung zones studied, there was a significant correlation between the decrease in cross-sectional lung area during exhalation and the increase in lung attenuation. At the lung bases, a greater increase in lung attenuation was noted during exhalation for a given change in cross-sectional lung area than in the upper lungs. All 10 subjects showed a distinct lobar attenuation gradient in the supine position. In general, lung attenuation increased homogeneously during exhalation, but four of the 10 subjects showed regions of inhomogeneity in lung attenuation during rapid exhalation indicative of air trapping, despite normal results on pulmonary function tests.
journal_name
Radiologyjournal_title
Radiologyauthors
Webb WR,Stern EJ,Kanth N,Gamsu Gdoi
10.1148/radiology.186.1.8416550subject
Has Abstractpub_date
1993-01-01 00:00:00pages
117-24issue
1eissn
0033-8419issn
1527-1315journal_volume
186pub_type
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