In this study, the IQ and radiation dose of a dental CBCT machine (CS 9300, Carestream Dental LLC, Atlanta, Georgia) were evaluated using IQ and dose index (DI) phantoms developed by Leeds Test Objects Ltd. (SEDENTEXCT, Boroughbridge, UK) for dental CBCT machines. Both phantoms are head-sized cylinders (160-mm diameter by 162-mm high) made of poly-methyl methacrylate (PMMA) with a density of to simulate the human tissue.9 Each phantom was placed on a tripod, leveled with a spirit level, and positioned using the lasers to align the phantom within the FOV, as shown in Fig. 1. IQ assessment was obtained using images of the IQ phantom scanned with the parameters listed in Table 1 and analyzed using ImageJ (National Institutes of Health, Bethesda, Maryland) software. To evaluate the radiation dose, the DI phantom was scanned with the same imaging parameters (Table 1). A calibrated thimble ionization chamber system, a Farmer ionization chamber ( 0.6 CT, Radcal Corp., Monrovia, California) in conjunction with a Radcal electrometer (AccuDose, Radcal Corp., Monrovia, California), was used following the SEDENTEX dose index (DI1) methodology. XR-QA2® Gafchromic™ (ISP Technologies Inc., Wayne, New Jersey) films were used to visualize axial dose distribution.