
Cone-beam computed tomography (CBCT) in the dental clinic must meet the EMC standards of GB 9706.1, YY 0505 (domestic), and IEC 60601-1-2 (international). Its principle is similar to that of a large CT scanner, but it is smaller in scale, comprising an X-ray tube, a flat panel detector, a rotating gantry, and a control unit. The standards require that interference generated by the rotating gantry motor and the high-voltage X-ray generator should not affect the digital image readout and transmission from the flat panel detector. Furthermore, in a dental clinic environment, its radiation and conducted emissions should not affect other electronic equipment (e.g., computers, dental handpieces), and the image reconstruction quality should be stable.