The American Journal of Orthodontics & Dentofacial Orthopedics has recently published the results of an in-vitro study that was designed to investigate relationship between computed gray levels in three CBCT scanners and one CT device using 5 software programs. The study concluded that the software programs were reliable and had no influence on the CT and CBCT gray level measurements. However, the gray levels might have discrepancies when different CT and CBCT scanners are used. Therefore, caution is essential when interpreting or evaluating CBCT images because of the significant differences in gray levels between different CBCT scanners, and between CBCT and CT values.
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