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. Author manuscript; available in PMC: 2018 May 1.
Published in final edited form as: J Comput Assist Tomogr. 2017 May-Jun;41(3):505–510. doi: 10.1097/RCT.0000000000000557

Table 1.

Phantom configurations and scan details. The effective diameter is defined as AP×LAT where AP and LAT are the anterior-posterior and lateral diameters, respectively. The tube current-time product is defined as the product of the instantaneous tube current (mA) and the gantry rotation time (s).

Phantom
Configuration		 Fat ring
thickness
(mm)		 Outer AP
diameter
(mm)		 Outer
LAT
diameter
(mm)		 Effective
Diameter
(mm)		 SECT tube
current-time
product (mAs)		 SECT CTDIvol
(mGy)		 GSI
protocol
number		 DECT tube
current-time
product
(mAs)		 *DECT
CTDIvol
(mGy)
80
kVp		 140
kVp		 80
kVp		 140
kVp
1 — 220 300 257 214 45 6.36 6.36 48 182 8.9
2 33 285 365 323 350 85 10.4 10.7 44 193 10.5
3 60 340 420 378 920 215 24.9 24.6 10 480 25.1
4 90 400 480 438 1400 600 37.9 68.6 5 600 32.0
*

The smaller range in DECT CTDIvol compared to the SECT CTDIvol reflects the available GSI protocol options.