Three-dimensional volumetric assessment of abnormally low attenuation of the lung from routine helical CT: inspiratory and expiratory quantification
| Autor: | Edward V. Staab, Willie F. Williams, Ricardo J. Gonzalez-Rothi, Russell Gibson, Patricia J. Mergo, Thomas Helmberger, Pablo R. Ros |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Adult
Lung Diseases Male medicine.medical_specialty Adolescent Functional Residual Capacity Vital Capacity Pulmonary function testing Functional residual capacity Forced Expiratory Volume Image Processing Computer-Assisted medicine Humans Radiology Nuclear Medicine and imaging Lung volumes Lung Diseases Obstructive Expiration Respiratory system Lung Aged Retrospective Studies Aged 80 and over business.industry Attenuation Total Lung Capacity General Medicine Middle Aged Respiratory Function Tests Residual Volume medicine.anatomical_structure Inhalation Pulmonary Emphysema Linear Models Female Tomography Radiology Pulmonary Ventilation Tomography X-Ray Computed Nuclear medicine business Forecasting |
| Zdroj: | American Journal of Roentgenology. 170:1355-1360 |
| ISSN: | 1546-3141 0361-803X |
| DOI: | 10.2214/ajr.170.5.9574615 |
| Popis: | The purpose of this investigation was to quantitatively assess abnormally low attenuation of the lung by use of three-dimensional volumetric reconstructions from routine helical CT and to assess their correlation with pulmonary function tests.Helical CT was performed in 100 patients in full inspiration. Examination was also performed in full expiration in 53 of these patients. Three-dimensional volumetric reconstructions were performed for total lung volumes at inspiration and at expiration, with a threshold of -896 H on inspiratory CT and -790 H on expiratory CT, to quantify emphysematous change. Correlation was made with pulmonary function tests in 79 patients.CT volumetric assessments of abnormally low attenuation of the lung at inspiration and expiration had a high correlation (r2 = .84, por = .0001). In comparison with pulmonary function tests, both inspiratory low attenuation of the lung and expiratory low attenuation of the lung correlated well with the logarithm of the ratio of the forced expiratory volume in 1 sec (FEV1) to the forced vital capacity (r2 = .74, por = .0001 and r2 = .74, por = .0001, respectively) and with the percentage of predicted ratio of the FEV1 to the forced vital capacity (r2 = .69, por = .0001 and r2 = .69, por = .0001, respectively). Linear correlations were also seen with FEV1, residual volume, and forced residual capacity.Three-dimensional volumetric reconstructions of hypoattenuating lung correlate well with pulmonary function tests. In addition, inspiratory and expiratory data are also correlative, suggesting that a dedicated expiratory examination is not needed. This easily obtainable information will prove useful for patients with obstructive lung disease from emphysema, providing a measure of pulmonary function status in this population. |
| Databáze: | OpenAIRE |
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