| Measuring small airways in transverse CT images correction for partial volume averaging and airway tilt. | |
| | |
MedLine Citation:
|
PMID: 20947386 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
RATIONALE AND OBJECTIVES: Airway wall dimensions can be determined in vivo using transverse computed tomographic (CT) images, but the measurement of airway phantoms shows that the wall thickness is consistently overestimated for small airways. This phantom study was performed to derive and test corrections to the measurements on the basis of consideration of partial volume averaging and tilt effects. MATERIALS AND METHODS: A lung phantom with six polycarbonate tubes embedded in foam was scanned, and the cross-sectional dimensions of the tubes were determined using the full width at half maximum, zero crossing, and phase congruency edge detection methods. Equations were derived using the reported wall intensity to correct for partial volume averaging. Corrections for the overestimation of the wall thickness due to the tilt of the tube with respect to the CT z-axis were also derived. RESULTS: All three methods (full width at half maximum, zero crossing, and phase congruency) overestimated the wall thickness of the small polycarbonate tubes. It was verified that two sources of error were partial volume averaging and tilt that was introduced when the phantom was positioned with tube axes at an angle to the CT z-axis. The corrections were applied to the measured tube wall dimensions and substantially reduced the deviation of the CT measurements from the true values. CONCLUSIONS: Correcting for partial volume effects and airway tilt greatly increases the accuracy of simulated airway wall measurements in transverse CT images. |
| | |
Authors:
|
Susan H Conradi; Barbara A Lutey; Jeffrey J Atkinson; Wei Wang; Robert M Senior; David S Gierada |
Related Documents
:
|
17504316 - Uterine artery embolization for symptomatic fibroids with imaging follow up. 17715096 - Volume ct: state-of-the-art reporting. 18851656 - Nature of the magnetic order in ca3co2o6. 3414556 - Evaluation of magnetic resonance imaging for determination of left ventricular ejection... 18950306 - Noninvasive imaging in cardiac resynchronization therapy--part 1: selection of patients. 10815666 - Posttherapeutic intraaxial brain tumor: the value of perfusion-sensitive contrast-enhan... |
Publication Detail:
|
Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't Date: 2010-10-14 |
Journal Detail:
|
Title: Academic radiology Volume: 17 ISSN: 1878-4046 ISO Abbreviation: Acad Radiol Publication Date: 2010 Dec |
Date Detail:
|
Created Date: 2010-11-08 Completed Date: 2011-03-07 Revised Date: 2011-12-21 |
Medline Journal Info:
|
Nlm Unique ID: 9440159 Medline TA: Acad Radiol Country: United States |
Other Details:
|
Languages: eng Pagination: 1525-34 Citation Subset: IM |
Copyright Information:
|
Copyright © 2010 AUR. Published by Elsevier Inc. All rights reserved. |
Affiliation:
|
Department of Radiology, Washington University School of Medicine, St Louis, MO 63110, USA. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Computer Simulation Phantoms, Imaging Pulmonary Alveoli / radiography* Software Tomography, X-Ray Computed* |
| Grant Support | |
ID/Acronym/Agency:
|
P50 HL084922/HL/NHLBI NIH HHS; P50 HL084922-049002/HL/NHLBI NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: PRP-paradigm provides evidence for a perceptual origin of the negative compatibility effect.
Next Document: Effects of contrast agent on water suppression and shimming of kidney single-volume proton MR spectr...