Optimization of exposure parameters in dental cone beam computed tomography using a 3-step approach

Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
Soontra PanmekiateRuben Pauwels

Abstract

The aim of this study was to find the optimal balance among tube voltage (kV), tube current (mA), and exposure time (s) in cone beam computed tomography (CBCT). Three human hemimandibles were scanned by using the 3D Accuitomo 170 scanner (J. Morita, Kyoto, Japan). First, 3 combinations of kilovolt (kV) and milliampere (mA) were used at a constant radiation dose. Seven observers evaluated the images; the kV of the highest-scoring scan was considered optimal. Second, the lowest acceptable mA for visualizing different anatomic structures was determined. Finally, the samples were scanned by using 3 combinations of tube current and exposure time; the observers determined the combination with the highest image quality. At a constant radiation dose, the highest available voltage (i.e., 90 kV) resulted in the highest image quality in terms of general impression, sharpness, noise, and artefacts. Depending on the anatomic structure, mA reductions of 20% to 40% compared with the default setting were possible. Fast-scan protocols showed equal or slightly better image quality compared with the standard-scan mode. For the CBCT model used in this study, optimization implies the use of the highest kV along with the shortest exposure time and a...Continue Reading

Citations

Mar 14, 2019·Dento Maxillo Facial Radiology·Danieli Moura BrasilReinhilde Jacobs
Jun 20, 2020·European Archives of Paediatric Dentistry : Official Journal of the European Academy of Paediatric Dentistry·J W G Van AckerS Rajasekharan
Dec 2, 2020·Dento Maxillo Facial Radiology·Aline Pf CaetanoMaria Ag Silva
Dec 23, 2020·Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)·Taku KuramotoKazunori Yoshiura
Dec 24, 2020·Dento Maxillo Facial Radiology·Kaan OrhanReinhilde Jacobs
Apr 22, 2021·Dento Maxillo Facial Radiology·Ruben PauwelsSoontra Panmekiate

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