Conditions and calibration to obtain comparable grey values between different clinical cone beam computed tomography scanners

Evaluation of soft tissues simulant materials in cone beam computed tomography

“…However, to compare values of different equipment, a linear correlation between the values should be performed. 1,2 The soft tissue simulant materials most commonly reported are wax 6,7,10,11 and liquid water, 6,8,11 due to their low cost, ease of handling, and great accessibility, 7 factors that accounted for their use in the present study. Ballistic gelatin has also been widely tested as a human tissue simulant, particularly in forensic research.…”

“…3,14,16,17 To evaluate their variability, some authors measured several regions of interest in the image to obtain the mean and standard deviation among these regions. 2,3,18 The literature makes it clear that voxel values vary according to the location in the scanned volume. 11,19 Therefore, in the present study, measurements were made in specified regions of the maxillomandibular complex, a condition different from those reported in previous studies which did not specify the regions analyzed.…”

“…6,7 Soft tissue simulation is important in several areas of dentistry since it brings additional information to diagnosis and planning. 2 Two-dimensional imaging studies have suggested the use of wax and water as soft tissue simulant materials. [6][7][8][9][10][11] However, none of these studies used a gold standard to evaluate these materials at the same thickness as that of the original tissue.…”

Influence of dental implantation on bone mineral density distribution: a pilot study

“…All of the patients’ images were taken from the same CBCT scanner (iCAT; Imaging Science International, Hatfield, PA, USA) at 300 mm voxel size with a scanning energy (120 kV and 5 mA) and 8.9 seconds scanning time. Following methodology developed in the previous studies, 1 5 6 bone voxels in the 3D images were segmented from non-bone voxels using a heuristic algorithm. A basal cortical bone (CB) of the mandible, which was determined below apex of tooth root level, was digitally isolated from the CBCT image using an image analysis software (ImageJ; NIH, Bethesda, MD, USA) ( Fig.…”

“…1 ). 5 6 7 Thus, the objective of the current study was to examine whether placing dental implants has an effect on BMD distribution of oral bone by comparing dentate, edentulous, and edentulous with implant therapy patients.…”