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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/8501

Title: Image quality vs radiation dose of four cone beam computed tomography scanners
Authors: Loubele, Miet
Jacobs, Reinhilde
Maes, Frederik
Denis, Kathleen
White, Stewart
Coudyzer, W
van Steenberghe, Daniel
Seutens, Paul
Issue Date: 2008
Publisher: Britisch Institute of Radiology
Abstract: Objectives: To evaluate image quality by examining segmentation accuracy and assess radiation dose for cone beam CT (CBCT) scanners. Methods: A skull phantom, scanned by a laser scanner, and a contrast phantomwere used to evaluate segmentation accuracy. The contrast phantom consisted of a polymethyl methacrylate (PMMA) cylinder with cylindrical inserts of air, bone and PMMA. The phantoms were scanned on the (1) Accuitomo 3D, (2) MercuRay, (3) NewTom 3G, (4) i-CAT and (5) Sensation 16. The structures were segmented with an optimal treshold. Thicknesses of the bone of the mandible and the diameter of the cylinders in the contrast phantom were measured across lines at corresponding places in the contrast phantom were measured across lines at corresponding places in the CT image vs a ground truth. The accuracy was in the 95th percentile of the difference between corresponding measurements. The correlation between accuracy in skull and contrast phantom was calculated. The radiation dose was assessed by DPI100,c) (dose profile integral 100,c) at the central hole of a CT dose index (CTDI) phantom. Results: The results for the DPI100,c were 107 mGy mm for (1), 1569 mGy mm for (2), 446 mGy mm for (3), 249 mGy mm for (4) and 1090 mGy mm for (5). The segmentations in the contrast phantom were submillimeter accurate in all scanners. The segmentation accuracy of the mandible was 2.9 mm for (1), 4.2 mm for (2), 3.4 mm for (3), 1.0 mm for (4) and 1.2 mm for (5). The correlation between measurements in the contrast and skull phantom was below 0.37 mm. Conclusions: The best radiation dose vs image quality was found for the i-CAT.
URI: http://hdl.handle.net/1942/8501
DOI: 10.1259/dmfr/16770531
ISI #: 000259375000002
ISSN: 0250-832X
Category: A1
Type: Journal Contribution
Validation: ecoom, 2009
Appears in Collections: Research publications

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