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. 2020 Jan 1;93(1105):20181019. doi: 10.1259/bjr.20181019

Table 1.

CTDIvol in mGy for each combination of kVp and mAs.

70 kVp 100 kVp
(with Sn filter)		 100 kVp
(without Sn filter)		 120 kVp
10 mAs 0.09 0.03 0.32 0.53
20 mAs 0.18 0.07 0.63 1.07
30 mAs 0.27 0.10 0.95 1.60
max mAs 2.34 0.83 7.60 10.68

CTDIvol, Computer Tomography Dose Index (volumetric).

Max mAs is 260 mAs for 70 kVp, 240 mAs for 100 kVp (independent of tin filter), and 200 for 120 kVp.