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Table 2: 
Average eye lens dose for each imaging protocol with CTDIvol and DLP measurements*
CT ProtocolMDCTCARE DoseCTDIvol (mGy) (mean ± SD)DLP (mGy.cm) (mean ± SD)Eye Lens Dose (mGy) (mean ± SD)PValueNo.
Brain (tilted axial mode)16+63.36 ± 2.18 (60.48, 65.86)930.50 ± 61.08 (847.00, 988.00)15.56 ± 4.18 (10.20, 22.50)NS (.183)1
–67.20 ± 0 (67.20, 67.20)985.67 ± 32.26 (941.00, 1008.00)18.14 ± 7.59 (10.60, 36.00)2
Brain (helical mode)16+83.44 ± 0.42 (83.15, 84.02)1421.33 ± 94.54 (1301.00, 1512.00)82.16 ± 13.43 (56.50, 97.90)NS (.096)3
–84.30 ± 0 (84.30, 84.30)1449.67 ± 94.43 (1319, 1517)88.83 ± 13.47 (65.30, 102.60)4
64+36.77 ± 1.76 (35.31, 39.34)601.33 ± 47.48 (559, 669)47.18 ± 5.99 (36.2, 60.0)<.0005
–53.33 ± 0.06 (53.30, 53.46)870.83 ± 32.00 (831, 909)63.90 ± 7.74 (49.10, 75.90)6
Paranasal sinus navigation16+40.57 ± 0.66 (39.42, 41.14)563.67 ± 28.24 (524, 595)45.90 ± 2.65 (40.3, 50.00)<.0007
64+20.69 ± 0.77 (19.96, 21.82)301.83 ± 7.11 (289, 310)28.96 ± 3.35 (22.80, 35.30)8
Temporal bone/orbits16+102.86 ± 7.08 (92.71, 109.31)483.33 ± 48.84 (424, 541)98.58 ± 9.03 (83.00, 111.7)<.0009
64+46.71 ± 2.07 (43.88, 48.59)298.50 ± 20.97 (270, 318)53.57 ± 10.07 (39.10, 70.50)10
  • Note:—NS indicates not significant; CTDIvol, volume CT dose index; DLP, dose-length product.
  • * The CTDIvol, DLP, and eye lens doses are tabulated as mean ± SD with the minimum and maximum values in parentheses. Comparison was made between protocols using the paired Student t test, and statistical significance was defined at P < .05.