Mark Plachtovics1, Janos Goczan2, Katalin Nagy3. 1. Research Associate, Faculty of Dentistry, University of Szeged, Tisza Lajos krt 64, Szeged, 6720, Hungary. Electronic address: Plachtovics.mark@stoma.szote.u-szeged.hu. 2. Research Associate, Resolution Specialist Treatment Centre, Becket House, Hendford, Yeovil, BA20 1 TE, UK. 3. Professor, Faculty of Dentistry, University of Szeged, Tisza Lajos krt 64, Szeged, 6720, Hungary.
Abstract
OBJECTIVE: The image quality of the reconstructed dental cone beam computed tomography (CBCT) acquisition is strongly dependent on the characteristics of the applied detector. Some flat panel detector (FPD) types require a warming-up period (WUP) to achieve a steady-state temperature; and some of them, those that have a cesium iodide detector, may require a calibration process (CP) after each WUP. STUDY DESIGN: Quality-assurance phantom was used for the evaluation of image quality, including spatial accuracy and density response with and without WUP and CP using iCAT Classic equipment. RESULTS: The correlation between the measured gray values and the multidetector computed tomography (MDCT) values deviated slightly from linearity (defined by the 45-degree line). There was no detectable difference in the spatial accuracy of the four different scanning modes. CONCLUSIONS: Although the WUP is important to reach the required steady-state temperature, the CP has a greater effect on the image quality.
OBJECTIVE: The image quality of the reconstructed dental cone beam computed tomography (CBCT) acquisition is strongly dependent on the characteristics of the applied detector. Some flat panel detector (FPD) types require a warming-up period (WUP) to achieve a steady-state temperature; and some of them, those that have a cesium iodide detector, may require a calibration process (CP) after each WUP. STUDY DESIGN: Quality-assurance phantom was used for the evaluation of image quality, including spatial accuracy and density response with and without WUP and CP using iCAT Classic equipment. RESULTS: The correlation between the measured gray values and the multidetector computed tomography (MDCT) values deviated slightly from linearity (defined by the 45-degree line). There was no detectable difference in the spatial accuracy of the four different scanning modes. CONCLUSIONS: Although the WUP is important to reach the required steady-state temperature, the CP has a greater effect on the image quality.