Mark Plachtovics1, Peter Bujtar2, Katalin Nagy3, Maurice Mommaerts4. 1. Research Associate, University of Szeged, Faculty of Dentistry, Szeged, Hungary. Electronic address: Plachtovics.mark@stoma.szote.u-szeged.hu. 2. Research Associate, Oral and Maxillo-Facial Surgery Department, University of Oulu, Oulu, Finland. 3. Professor, Department of Cranio-Maxillo-Facial Surgery, European Face Centre, Vrije Universiteit Brussel, Brussels, Belgium. 4. Professor, University of Szeged, Faculty of Dentistry, Szeged, Hungary.
Abstract
OBJECTIVE: With a double exposure overlapping cone beam computed tomography (CBCT) scan technique, using CBCT acquisition radiation dose, the objective was to obtain apparent density similar to that of multidetector computed tomography (MDCT). STUDY DESIGN: Factory quality-assurance phantom and water phantom were used for the evaluation of apparent density fidelity of iCAT scans in different modes. Each scan's apparent density was analyzed for identical regions using ImageJ, version 1.42q. RESULTS: The iCAT Classic extended height acquisition with 4-cm central overlap and reconstruction of 2 groups of 300 projections per rotation for the water and quality-assurance CBCT phantoms resulted in improved apparent density fidelity. This apparent density accuracy was superior to that of iCAT scan at high resolution (600 projections during 1 rotation). CONCLUSIONS: Using double exposure overlapping CBCT scans allows the analysis quality to be comparable with that of MDCT.
OBJECTIVE: With a double exposure overlapping cone beam computed tomography (CBCT) scan technique, using CBCT acquisition radiation dose, the objective was to obtain apparent density similar to that of multidetector computed tomography (MDCT). STUDY DESIGN: Factory quality-assurance phantom and water phantom were used for the evaluation of apparent density fidelity of iCAT scans in different modes. Each scan's apparent density was analyzed for identical regions using ImageJ, version 1.42q. RESULTS: The iCAT Classic extended height acquisition with 4-cm central overlap and reconstruction of 2 groups of 300 projections per rotation for the water and quality-assurance CBCT phantoms resulted in improved apparent density fidelity. This apparent density accuracy was superior to that of iCAT scan at high resolution (600 projections during 1 rotation). CONCLUSIONS: Using double exposure overlapping CBCT scans allows the analysis quality to be comparable with that of MDCT.