Accuracy of radiographic lung volume using new equations derived from computed tomography
作者:
MATTHEW COOPER,
PAUL FRIEDMAN,
RICHARD PETERS,
JOHN BRIMM,
期刊:
Critical Care Medicine
(OVID Available online 1986)
卷期:
Volume 14,
issue 3
页码: 177-181
ISSN:0090-3493
年代: 1986
出版商: OVID
数据来源: OVID
摘要:
This study compared radiographic measurements of regional lung volume with corresponding physiologic measurements. The database included 48 normal, supine adults who had previously undergone spirometry and helium-dilution lung volume measurements to determine physiologic functional residual capacity (G-FRC) and total lung capacity (G-TLC). Chest x-rays had also been obtained for these subjects at functional residual capacity and total lung capacity.To calculate radiographic lung volumes at functional residual capacity and total lung capacity (R-FRC and R-TLC, respectively), we traced the lung outline from the chest x-ray, and digitized each outline. We then calculated total and regional lung volumes, using equations previously derived from computed tomographic scans. R-FRC and R-TLC were closely correlated (r = 0.973, maximum SEE 6.8%) with G-FRC and G-TLC, whether or not separate equations were used for regions below the diaphragm. Using only maximum anteroposterior diameter reduced the r-value to 0.957 (SEE 9.6%). The accuracy of our method of radiographic measurement of regional lung volume was validated by the concurrence between the physiologic and radiographic measurements.
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