Table 5:

Absorbed radiation dose to the lenses of the eye and parotid and thyroid glands for each imaging technique^{^a}

	Absorbed Dose Right Lens (mGy)	Absorbed Dose Left Lens (mGy)	Absorbed Dose Right Parotid Gland (mGy)	Absorbed Dose Thyroid Gland (mGy)
CT	9.25 ± 1.69	9.69 ± 1.08	8.87 ± 1.68	0.45 ± 0.13
Conebeam CT	0.28 ± 0.01^{^b}	0.4 ± 0.03^{^b}	0.69 ± 0.05	0.05 ± 0.05
Difference	8.97^{^c}	9.29^{^c}	8.18^{^c}	0.4^{^c}

↵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.