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
Korean Journal of Radiology
;
: 226-235, 2008.
Article
in English
| WPRIM
| ID: wpr-46423
ABSTRACT
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-of-view (FOV), and slice thickness on the automatic measurement of airway dimension. MATERIALS ANDMETHODS:
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 full-width-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.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Respiratory System
/
Feasibility Studies
/
Phantoms, Imaging
/
Cone-Beam Computed Tomography
Language:
English
Journal:
Korean Journal of Radiology
Year:
2008
Type:
Article
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