The reconstructed Cone Beam CT image quality

Source:  The reconstructed Cone Beam CT image quality    Tag:  skeletal dysplasia ppt
The effect of calibration and detector temperature on the reconstructed Cone Beam CT image quality A study for the work-flow of the iCAT Classic equipment
Publication date:  Available online 31 December 2014
Source:Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
Author(s): Mark Plachtovics , Janos Goczan , Katalin Nagy
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 grey values and the multidetector computed tomography (MDCT) values were slightly deviating from linearity (defined by the 45 o 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.