UUnniivveerrssiittyy ooff LLoouuiissvviillllee TThhiinnkkIIRR:: TThhee UUnniivveerrssiittyy ooff LLoouuiissvviillllee''ss IInnssttiittuuttiioonnaall RReeppoossiittoorryy Electronic Theses and Dissertations 5-2014 EEffffeecctt ooff mmeettaalllliicc rreessttoorraattiioonn aarrttiiffaaccttss oonn mmaaxxiillllooffaacciiaall ccoonnee bbeeaamm ccoommppuutteedd ttoommooggrraapphhyy iimmaaggeess.. Mitali Binani 1987- University of Louisville Follow this and additional works at: https://ir.library.louisville.edu/etd Part of the Oral Biology and Oral Pathology Commons RReeccoommmmeennddeedd CCiittaattiioonn Binani, Mitali 1987-, "Effect of metallic restoration artifacts on maxillofacial cone beam computed tomography images." (2014). Electronic Theses and Dissertations. Paper 110. https://doi.org/10.18297/etd/110 This Master's Thesis is brought to you for free and open access by ThinkIR: The University of Louisville's Institutional Repository. It has been accepted for inclusion in Electronic Theses and Dissertations by an authorized administrator of ThinkIR: The University of Louisville's Institutional Repository. This title appears here courtesy of the author, who has retained all other copyrights. For more information, please contact [email protected]. EFFECT OF METALLIC RESTORATION ARTIFACTS ON MAXILLOFACIAL CONE BEAM COMPUTED TOMOGRAPHY IMAGES By Mitali Binani M.S, University of Louisville, 2014 A Thesis Submitted to the Faculty of the School of Dentistry of the University of Louisville In Partial Fulfillment of the Requirements For the Degree of Master of Science Oral Biology Louisville, Kentucky May, 2014 EFFECT OF METALLIC RESTORATION ARTIFACTS ON MAXILLOFACIAL CONE BEAM COMPUTED TOMOGRAPHY IMAGES. By Mitali Binani M.S, University of Louisville, 2014 A Thesis Approved on April 17, 2014 By the following Thesis Committee: ________________________________ Dr. Allan G. Farman, Thesis Co-Director ________________________________ Dr. William C. Scarfe, Thesis Co-Director ________________________________ Dr. Bryan T. Harris, Committe Member ii DEDICATION This thesis is dedicated to my family and friends for their love and support. Without their encouragement, this thesis would not have been possible. iii ACKNOWLEDGEMENTS Dr. Allan G Farman, Thesis Co-Director, for providing me the opportunity to work under his guidance, and for contributing to this research project with his immense expertise in the specialty of Oral and Maxillofacial Radiology. Dr. William C Scarfe, Thesis Co-Director, for his constant support and enthusiasm in all phases of the research. It was his relentless mentorship that made this project a successful endeavor. Dr. Bryan T Harris, Thesis Committee Member, for his help to refine this project with his knowledge. iv ABSTRACT EFFECT OF METALLIC RESTORATION ARTIFACTS ON MAXILLOFACIAL CONE BEAM COMPUTED TOMOGRAPHY IMAGES. Mitali Binani April 17, 2014 Artifacts due to high-density objects (HDO) such as metallic dental restorations on maxillofacial cone beam computed tomographic (CBCT) images can render certain areas unsuitable for diagnosis. It was hypothesized that image quality due to HDO artifacts was affected by CBCT acquisition parameters and the number and configuration of HDO. Simulated complete maxillary and mandibular dental arches were constructed using dental stone and extracted teeth. Conservative coronal dental amalgam (MOD) restorations on premolar and molar teeth were used as HDOs. Gray values (GV) measured on uniform dental stone test cylinders at specific levels from the occlusal plane at three tooth locations was used as an index of artifact effect on image quality. Scans with various HDO configurations were taken at several acquisition parameters for three CBCT systems: Accuitomo 170 (J. Morita MFG. Corp, Kyoto, Japan), iCAT Next Generation (Imaging Sciences International Inc., Hatfield, PA, USA) and Carestream 9000 3D (Carestream/KODAK, Atlanta, GA). For all systems, HDOs significantly affected images throughout the field of view, with machine specific beam hardening or scatter artifacts. Worst beam hardening affected areas were within 0mm-4mm of the occlusal plane of the ipsilateral test cylinder. The Accuitomo 170 was unaffected by v acquisition parameters. Caution must be exercised when assessing CBCT images for coronal dental caries and other pathologies in the presence of HDOs to prevent errors in diagnosis due to beam hardening or scatter artifacts. vi TABLE OF CONTENTS PAGE DEDICATION .............................................................................................................. iii ACKNOWLEDGMENTS ............................................................................................. iv ABSTRACT .................................................................................................................... v LIST OF FIGURES ........................................................................................................ ix LIST OF TABLES .......................................................................................................... x INTRODUCTION AND LITERATURE REVIEW ........................................................ 1 HYPOTHESIS ................................................................................................................ 5 Objectives ....................................................................................................................... 5 Null Hypothesis ............................................................................................................... 6 MATERIALS AND METHODS ..................................................................................... 7 Overall Research Design ................................................................................................. 7 In vitro model ..................................................................................................... 8 High Density Object (HDO) Configuration ....................................................... 10 Cone Beam Computed Tomographic Imaging .................................................. 10 Analysis ........................................................................................................... 14 CBCT Image Evaluation ............................................................. 14 Data Analysis .............................................................................. 14 RESULTS ..................................................................................................................... 16 Overview ........................................................................................................... 16 Descriptive ......................................................................................................... 17 Analytical .......................................................................................................... 25 DISCUSSION ............................................................................................................... 49 CONCLUSION ............................................................................................................. 53 vii REFERENCES .............................................................................................................. 54 APPENDIX A ............................................................................................................... 56 CURRICULUM VITAE ................................................................................................ 60 viii