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Evaluation of subjective image quality in relation to diagnostic task for cone beam computed tomography with different fields of view.

Journal article
Authors Sara Lofthag-Hansen
Anne Thilander-Klang
Kerstin Gröndahl
Published in European journal of radiology
Volume 80
Issue 2
Pages 483-488
ISSN 1872-7727
Publication year 2011
Published at Institute of Clinical Sciences, Department of Radiation Physics
Institute of Odontology
Pages 483-488
Language en
Links dx.doi.org/10.1016/j.ejrad.2010.09....
Keywords Cone beam computed tomography; Dentomaxillofacial; Image quality; Diagnostic task; Dose-area product
Subject categories Radiological research, Radiological physics, Radiology

Abstract

AIMS: To evaluate subjective image quality for two diagnostic tasks, periapical diagnosis and implant planning, for cone beam computed tomography (CBCT) using different exposure parameters and fields of view (FOVs). MATERIALS AND METHODS: Examinations were performed in posterior part of the jaws on a skull phantom with 3D Accuitomo (FOV 3cm×4cm) and 3D Accuitomo FPD (FOVs 4cm×4cm and 6cm×6cm). All combinations of 60, 65, 70, 75, 80kV and 2, 4, 6, 8, 10mA with a rotation of 180° and 360° were used. Dose-area product (DAP) value was determined for each combination. The images were presented, displaying the object in axial, cross-sectional and sagittal views, without scanning data in a random order for each FOV and jaw. Seven observers assessed image quality on a six-point rating scale. RESULTS: Intra-observer agreement was good (κ(w)=0.76) and inter-observer agreement moderate (κ(w)=0.52). Stepwise logistic regression showed kV, mA and diagnostic task to be the most important variables. Periapical diagnosis, regardless jaw, required higher exposure parameters compared to implant planning. Implant planning in the lower jaw required higher exposure parameters compared to upper jaw. Overall ranking of FOVs gave 4cm×4cm, 6cm×6cm followed by 3cm×4cm. CONCLUSIONS: This study has shown that exposure parameters should be adjusted according to diagnostic task. For this particular CBCT brand a rotation of 180° gave good subjective image quality, hence a substantial dose reduction can be achieved without loss of diagnostic information.

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