Semi-Automatic Measurement of the Airway Dimension by Computed Tomography Using the Full-Width-Half- Maximum Method: a Study on the Measurement Accuracy according to the CT Parameters and Size of the Airway

Cited 0 time in webofscience Cited 0 time in scopus
Kim, Namkug; Seo, Joon Beom; Song, Koun-Sik; Chae, Eun Jin; Kang, Suk-Ho
Issue Date
대한영상의학회 = The Korean Society of Radiology
Korean J Radiol 2008;9:226-235
AirwayComputed tomography (CT)FWHM (Full Width at Half Maximum)Measurement, phantom
Objective: To assess the influence of variable factors such as the size of the
airway and the CT imaging parameters such as the reconstruction kernel, field-ofview
(FOV), and slice thickness on the automatic measurement of airway dimension.
Materials and Methods: An airway phantom was fabricated that contained
eleven poly-acryl tubes of various lumen diameters and wall thicknesses. The
measured density of the poly-acryl wall was 150 HU, and the measured density of
the airspace filled with polyurethane foam was 900 HU. CT images were
obtained using a 16-MDCT (multidetector CT) scanner and were reconstructed
with various reconstruction kernels, thicknesses and FOV. The luminal radius
and wall thickness were measured using in-house software based on the fullwidth-
half-maximum method. The measured values as determined by CT and the
actual dimensions of the tubes were compared.
Results: Measurements were most accurate on images reconstructed with use
of a standard kernel (mean error: 0.03+-0.21 mm for wall thickness and 0.12
0.11 mm for the luminal radius). There was no significant difference in accuracy
among images with the use of variable slice thicknesses or a variable FOV.
Below a 1-mm threshold, the measurement failed to represent the change of the
real dimensions.
Conclusion: Measurement accuracy was strongly influenced by the specific
reconstruction kernel utilized. For accurate measurement, standardization of the
imaging protocol and selection of the appropriate anatomic level are essential.
Files in This Item:
Appears in Collections:
College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Industrial Engineering (산업공학과)Journal Papers (저널논문_산업공학과)
  • mendeley

Items in S-Space are protected by copyright, with all rights reserved, unless otherwise indicated.