Fedil Andraws Yalda1,2, Chrysoula Theodorakou3, Rosalyn J Clarkson4, Jonathan Davies5, Lee Feinberg6, Anita Sengupta2, Keith Horner2. 1. College of Dentistry, Hawler Medical University, Erbil, Iraq. 2. Division of Dentistry, School of Medical Sciences, Faculty of Biology, Medicine andHealth, University of Manchester, Manchester Academic Health Science Centre, Manchester, UK. 3. Christie Medical Physics and Engineering, The Christie NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, UK. 4. Department of Radiology, Leeds Dental Institute, Clarendon Way, Leeds, UK. 5. Department of Dental Radiological Imaging, Guy's and St Thomas' NHS FoundationTrust, Guy's Hospital, London, UK. 6. Department of Radiology, Kings College Hospital, London, UK.
Abstract
OBJECTIVES: The aim of this study was to determine a "low-dose protocol" which provides acceptable diagnostic accuracy for detection of root fractures in unrestored anterior maxillary teeth, using an ex vivo model. METHODS: 48 maxillary anterior teeth, half with horizontal or oblique root fractures, were imaged using CBCT in an anthropomorphic model. Nine X-ray exposure combinations were used, including the manufacturer's standard ("reference") exposure and high-resolution settings ("HiRes"), by varying kV, exposure time, and rotation angle. Measurements of Dose Area Product (DAP) were recorded. Five dental radiologists assessed the scans for root fractures and judged image quality. Parameters of diagnostic accuracy were calculated, including area under the Receiver Operating Characteristic curve (Az). Objective measures of image quality were made at the same exposure combinations using an image quality phantom. RESULTS: Although there was a significant linear relationship between DAP and mean Az, only the lowest DAP exposure combination had a mean Az significantly different to the reference exposure. There was no significant effect on other diagnostic accuracy parameters when using HiRes compared with the reference exposure. There was a significant positive relationship between DAP and contrast resolution. HiRes did not significantly improve contrast resolution and made a small improvement to spatial resolution. CONCLUSIONS: Scope existed for radiation dose reduction compared with the manufacturer's guidance. There was no improvement in diagnostic accuracy using HiRes settings. A cautious recommendation for this CBCT machine is that it is possible to achieve a dose reduction of about 20% compared with the reference exposure parameters.
OBJECTIVES: The aim of this study was to determine a "low-dose protocol" which provides acceptable diagnostic accuracy for detection of root fractures in unrestored anterior maxillary teeth, using an ex vivo model. METHODS: 48 maxillary anterior teeth, half with horizontal or oblique root fractures, were imaged using CBCT in an anthropomorphic model. Nine X-ray exposure combinations were used, including the manufacturer's standard ("reference") exposure and high-resolution settings ("HiRes"), by varying kV, exposure time, and rotation angle. Measurements of Dose Area Product (DAP) were recorded. Five dental radiologists assessed the scans for root fractures and judged image quality. Parameters of diagnostic accuracy were calculated, including area under the Receiver Operating Characteristic curve (Az). Objective measures of image quality were made at the same exposure combinations using an image quality phantom. RESULTS: Although there was a significant linear relationship between DAP and mean Az, only the lowest DAP exposure combination had a mean Az significantly different to the reference exposure. There was no significant effect on other diagnostic accuracy parameters when using HiRes compared with the reference exposure. There was a significant positive relationship between DAP and contrast resolution. HiRes did not significantly improve contrast resolution and made a small improvement to spatial resolution. CONCLUSIONS: Scope existed for radiation dose reduction compared with the manufacturer's guidance. There was no improvement in diagnostic accuracy using HiRes settings. A cautious recommendation for this CBCT machine is that it is possible to achieve a dose reduction of about 20% compared with the reference exposure parameters.
Authors: Stuart C White; William C Scarfe; Ralf K W Schulze; Alan G Lurie; Joanna M Douglass; Allan G Farman; Clarice S Law; Martin D Levin; Robert A Sauer; Richard W Valachovic; Gregory G Zeller; Marilyn J Goske Journal: Oral Surg Oral Med Oral Pathol Oral Radiol Date: 2014-06-16
Authors: J B Ludlow; R Timothy; C Walker; R Hunter; E Benavides; D B Samuelson; M J Scheske Journal: Dentomaxillofac Radiol Date: 2015 Impact factor: 2.419
Authors: Margarete B McGuigan; Christie Theodorakou; Henry F Duncan; Jonathan Davies; Anita Sengupta; Keith Horner Journal: Dentomaxillofac Radiol Date: 2020-06-22 Impact factor: 2.419