Measurement accuracy in cone beam computed tomography in the presence of metal artifact
department or school: Dentistry, Faculty of
data provider: DSpace
degree campus: UBCV
creator: Ismail, Ahmed
issued: 2020-07-14T18:19:30Z
issued: 2020
related degree: Master of Science - MSc
degree grantor: University of British Columbia
description: Purpose: Cone beam computed tomography (CBCT) image quality is known to be affected by artifacts produced by metal restorations, causing image deterioration via bright streaks and loss of gray values in the vicinity of the metallic structure. The aim of the study is to determine the impact of progressively increasing metal artifacts on the measurement accuracy of commonly evaluated points in implant treatment planning. Methods: Holes were drilled into porcine mandibles at known distances from the alveolar crest on the buccal and lingual surfaces and filled with gutta percha. Repeated CBCT images were taken, with progressively increasing amalgam restorations and stainless-steel crowns (up to a total of 8 restorations per jaw). The imaging field of view (FOV) was of a single site (5x5cm) in 2 different locations in the mandible, as well as a full arch FOV (10x5cm). Measurement between the buccal and lingual gutta percha points on the mandible was performed using a digital caliper to establish the difference between caliper measurements compared to the same measurements taken digitally on the CBCT images. Measurements were compared under conditions with no restorations and with increasing numbers of restorations. Results: Comparison between caliper measurements and baseline CBCT with no metal artifact demonstrated differences ranging from 0-1.7 mm. This range of variation appears to be consistent even with increasing metal artifact, with no clear detectable pattern of change. When compared to baseline measurements, scans with amalgam and stainless-steel restorations showed a maximum difference of 0.54 ± 0.64 mm and 0.62 ± 0.64 mm respectively. The change in measurements was not found to be significantly different with increasing metal restorations. Conclusions: There may be a variation of up to 1.7 mm between measured anatomical points and CBCT imaging under commonly used settings. While this result may be clinically important, it does not appear to be affected by incr…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/75162
note: MEASUREMENT ACCURACY IN CONE BEAM COMPUTED TOMOGRAPHY IN THE PRESENCE OF METAL ARTIFACT by Ahmed Ismail B.Sc., Dalhousie University, 2008 D.D.S., Dalhousie University, 2012 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE in THE FACULTY OF GRADUATE AND POSTDOCTORAL STUDIES (Craniofacial Science) THE UNIVERSITY OF BRITISH COLUMBIA (Vancouver) July 2020 © Ahmed Ismail, 2020 ii The following individuals certify that they have read, and recommend to the Faculty of Graduate and Postdoctoral Studies for acceptance, the thesis entitled: MEASUREMENT ACCURACY IN CONE BEAM COMPUTED TOMOGRAPHY IN THE PRESENCE OF METAL ARTIFACT submitted by Ahmed Ismail in partial fulfillment of the requirements for the degree of Master of Science in Craniofacial Science Examining Committee: Dr. Nancy L. Ford – Faculty of Dentistry Supervisor Dr. Flavia Lakschevitz – Faculty of Dentistry Supervisory Committee Member Dr. David MacDonald – Faculty of Dentistry Supervisory Committee Member Dr. Vincent Lee – Faculty of Dentistry Additional Examiner iii Abstract Purpose: Cone beam computed tomography (CBCT) image quality is known to be affected by artifacts produced by metal restorations, causing image deterioration via bright streaks and loss of gray values in the vicinity of the metallic structure. The aim of the study is to determine the impact of progressively increasing metal artifacts on the measurement accuracy of commonly evaluated points in implant treatment planning. Methods: Holes were drilled into porcine mandibles at known distances from the alveolar crest on the buccal and lingual surfaces and filled with gutta percha. Repeated CBCT images were taken, with progressively increasing amalgam restorations and stainless-steel crowns (up to a total of 8 restorations per jaw). The imaging field of view (FOV) was of a single site (5x5cm) in 2 different locations in the mandible, as well as a full arch FOV (10x5cm). Measurement between the buccal…
has type: Thesis/Dissertation
date issued: 2020-11
is shown at: 10.14288/1.0392375
language: eng
degree discipline: Craniofacial Science
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/75162