Radiology
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Published online before print January 23, 2007, 10.1148/radiol.2423060196
This Article
Right arrow Figures Only
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow All Versions of this Article:
2423060196v1
242/3/898    most recent
Right arrow Submit a response
Right arrow Alert me when this article is cited
Right arrow Alert me when eLetters are posted
Right arrow Alert me if a correction is posted
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Bankier, A. A.
Right arrow Articles by Gevenois, P. A.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Bankier, A. A.
Right arrow Articles by Gevenois, P. A.
(Radiology 2007;242:898-906.)
© RSNA, 2007

Thoracic Imaging

Air Trapping: Comparison of Standard-Dose and Simulated Low-Dose Thin-Section CT Techniques1

Alexander A. Bankier, MD, Cornelia Schaefer-Prokop, MD, Viviane De Maertelaer, PhD, Denis Tack, MD, PhD, Peter Jaksch, MD, Walter Klepetko, MD and Pierre Alain Gevenois, MD, PhD

1 From the Department of Radiology (A.A.B.) and Department of Cardio-Thoracic Surgery, Lung Transplantation Unit (P.J., W.K.), Medical University of Vienna, Waehringer Guertel 18-20, A-1090 Vienna, Austria; Department of Radiology, University of Amsterdam, Amsterdam, the Netherlands (C.S.); Statistical Unit, Institute of Interdisciplinary Research in Human and Molecular Biology (V.D.M.), and Department of Radiology, University Erasme Hospital (P.A.G.), Université Libre de Bruxelles, Brussels, Belgium; and Department of Radiology, RHMS Clinic Louis Caty, Baudour, Belgium (D.T.). Received February 1, 2006; revision requested March 29; revision received April 6; final version accepted June 1. Address correspondence to A.A.B. (e-mail: alexander.bankier{at}meduniwien.ac.at).

Purpose: To prospectively investigate the effect of radiation dose reduction on the visual quantification of air trapping at expiratory thin-section computed tomography (CT).

Materials and Methods: In this ethical committee–approved study, 27 lung transplant recipients (12 women, 15 men; mean age, 54 years ± 2 [standard error of the mean]) underwent expiratory thin-section CT at 140 kVp and 80 mAs (effective). All patients gave written informed consent. Dose reduction corresponding to 60, 40, and 20 mAs (effective) was simulated. The extent of air trapping in both original and dose-reduced studies was scored by three independent readers. The effects of tube current–time product, reader, reading session, and body mass index on average air trapping scores were assessed with analysis of variance. Agreements between and within observers were assessed with a weighted {kappa} statistic. Subjective scores for diagnostic confidence were attributed (3 = high, 2 = medium, 1 = low), and their means were calculated for each tube current–time product value.

Results: No significant effect on average air trapping scores as a result of tube current–time product (P = .222), reader (P = .217), reading session (P = .705), or body mass index (P = .505) could be detected. At 80 mAs, agreement between readers was excellent; agreement decreased to good or moderate at lower tube current settings. Agreement within readers decreased with a decrease in dose but remained good even at 20 mAs. Confidence also decreased, with mean scores decreasing from 2.33 ± 0.73 (standard deviation) to 1.04 ± 0.19 when dose decreased.

Conclusion: At 140 kVp, the tube current–time product can be reduced from 80 to 20 mAs without impairing the visual quantification of air trapping at expiratory thin-section CT and with acceptable decreases in agreement between and within readers and in reader confidence.

© RSNA, 2007




This article has been cited by other articles:


Home page
 RadiologyHome page
E. Y. Lee and P. M. Boiselle
Tracheobronchomalacia in Infants and Children: Multidetector CT Evaluation
Radiology, July 1, 2009; 252(1): 7 - 22.
[Abstract] [Full Text] [PDF]

Home page
 RadiologyHome page
S. Matsuoka, Y. Kurihara, K. Yagihashi, M. Hoshino, and Y. Nakajima
Airway Dimensions at Inspiratory and Expiratory Multisection CT in Chronic Obstructive Pulmonary Disease: Correlation with Airflow Limitation
Radiology, September 1, 2008; 248(3): 1042 - 1049.
[Abstract] [Full Text] [PDF]

Home page
 RadiologyHome page
A. A. Bankier, S. Mehrain, D. Kienzl, M. Weber, M. Estenne, and P. A. Gevenois
Regional Heterogeneity of Air Trapping at Expiratory Thin-Section CT of Patients with Bronchiolitis: Potential Implications for Dose Reduction and CT Protocol Planning
Radiology, June 1, 2008; 247(3): 862 - 870.
[Abstract] [Full Text] [PDF]