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Table 5: 
Absorbed radiation dose to the lenses of the eye and parotid and thyroid glands for each imaging techniquea
Absorbed Dose Right Lens (mGy)Absorbed Dose Left Lens (mGy)Absorbed Dose Right Parotid Gland (mGy)Absorbed Dose Thyroid Gland (mGy)
CT9.25 ± 1.699.69 ± 1.088.87 ± 1.680.45 ± 0.13
Conebeam CT0.28 ± 0.01b0.4 ± 0.03b0.69 ± 0.050.05 ± 0.05
Difference8.97c9.29c8.18c0.4c
  • ↵a Data are mean values ± SD.
  • ↵b For Conebeam CT, the absorbed radiation dose to the left lens was significantly higher than the dose to the right lens because the x-ray tube describes a 190° rotation around the left side of the patient's face.
  • ↵c P < .001.