Document Detail

CT attenuation of paired HRCT scans obtained at full inspiratory/expiratory position: comparison with pulmonary function tests.
MedLine Citation:
PMID:  12386770     Owner:  NLM     Status:  MEDLINE    
The purpose of this prospective study was to measure lung attenuation at paired HRCT obtained at full inspiratory/expiratory position, to correlate with pulmonary function tests (PFTs) and to characterize different types of ventilatory impairment. One hundred fifty-five patients with and without pulmonary disease underwent paired HRCT obtained at full inspiratory/expiratory position. Three scan pairs were evaluated by densito- and planimetry using dedicated software. The PFTs were available for correlation in all patients (mean interval 5 days). Mean lung density (MLD) at full inspiration was -813 HU, and MLD at full expiration was -736 HU; both, as well as the expiratory attenuation increase, demonstrated significant correlations with static and dynamic lung volumes: up to r=0.68, p<0.05 for residual volume. The MLD and emphysema indices correlated markedly better for scans obtained at full expiration than at full inspiration, e.g. correlation with the residual volume: r=0.68 compared with r=0.55. Even better correlations were obtained for the lung area (229 cm(2) at inspiration, 190 cm(2) at expiration), up to r=0.74 for the lung area in expiration and the intrathoracic gas volume. Inspiratory MLD and the expiratory attenuation increase were able to differentiate obstructive and restrictive ventilatory impairment from normal subjects, the best results were obtained from scans obtained at full expiratory position ( p<0.05). In conclusion, scans obtained at full expiratory position reveal more functional information than scans obtained at full inspiratory position. Quantitative analysis of CT obtained at full expiratory position provides good estimations of static and dynamic lung volumes as well as significant differences between normal subjects and patients with ventilatory impairment.
Hans-Ulrich Kauczor; Jochem Hast; Claus Peter Heussel; Jens Schlegel; Peter Mildenberger; Manfred Thelen
Publication Detail:
Type:  Journal Article     Date:  2002-06-14
Journal Detail:
Title:  European radiology     Volume:  12     ISSN:  0938-7994     ISO Abbreviation:  Eur Radiol     Publication Date:  2002 Nov 
Date Detail:
Created Date:  2002-10-18     Completed Date:  2003-04-03     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  9114774     Medline TA:  Eur Radiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  2757-63     Citation Subset:  IM    
Department of Radiology, Johannes Gutenberg University Mainz, Langenbeckstrasse 1, 55131 Mainz, Germany.
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MeSH Terms
Lung / radiography*
Lung Volume Measurements
Middle Aged
Prospective Studies
Pulmonary Ventilation
Respiratory Function Tests*
Tomography, X-Ray Computed / methods*

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