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Table 4: Effects of starting point of scanning on the lens dose
CT Scanner (Number of Detector Rows) Scans from Orbitomeatal Line Scans from Superior Orbital Rim
D_OM (mGy) D_OM/D_IOR(%) D_OM/CTDIvol (%) D_SOR (mGy) D_SOR/D_IOR(%) D_SOR/CTDIvol (%)
Aquilion 64 (64) 89.9 ± 4.4 86.9 79.3 12.2 ± 0.6 11.8 10.8
LightSpeed VCT (64) 64.5 ± 1.5 79.1 60.3 11.0 ± 0.7 13.5 10.4
LightSpeed Ultra 16 (16) 57.9 ± 0.9 81.0 67.5 9.2 ± 0.2 12.9 10.7
LightSpeed Ultra 8 (8) 52.2 ± 1.6 92.2 78.5 7.7 ± 0.3 13.6 11.6
LightSpeed QX/i (4) 64.6 ± 0.6 92.0 86.0 10.3 ± 0.2 14.7 13.7
Brilliance CT 64 (64) 56.9 ± 2.1 92.2 78.6 12.9 ± 0.6 20.9 17.8
MX 8000 IDT (16) 44.6 ± 3.7 92.7 86.1 7.1 ± 0.3 14.8 13.7
Somatom Sensation Cardiac 64 (64) 42.2 ± 0.4 87.2 71.8 8.9 ± 0.8 8.4 15.2

CT Scanner (Number of Detector Rows)	Scans from Orbitomeatal Line			Scans from Superior Orbital Rim
CT Scanner (Number of Detector Rows)	D_OM (mGy)	D_OM/D_IOR(%)	D_OM/CTDIvol (%)	D_SOR (mGy)	D_SOR/D_IOR(%)	D_SOR/CTDIvol (%)
Aquilion 64 (64)	89.9 ± 4.4	86.9	79.3	12.2 ± 0.6	11.8	10.8
LightSpeed VCT (64)	64.5 ± 1.5	79.1	60.3	11.0 ± 0.7	13.5	10.4
LightSpeed Ultra 16 (16)	57.9 ± 0.9	81.0	67.5	9.2 ± 0.2	12.9	10.7
LightSpeed Ultra 8 (8)	52.2 ± 1.6	92.2	78.5	7.7 ± 0.3	13.6	11.6
LightSpeed QX/i (4)	64.6 ± 0.6	92.0	86.0	10.3 ± 0.2	14.7	13.7
Brilliance CT 64 (64)	56.9 ± 2.1	92.2	78.6	12.9 ± 0.6	20.9	17.8
MX 8000 IDT (16)	44.6 ± 3.7	92.7	86.1	7.1 ± 0.3	14.8	13.7
Somatom Sensation Cardiac 64 (64)	42.2 ± 0.4	87.2	71.8	8.9 ± 0.8	8.4	15.2