Table 1.

Acquisition parameters for dual source Somatom Force (Siemens, Erlangen, Germany) for tube A and tube B (smaller detector) and Dual Energy Composition (DE comp) set at 0.5 i.e. equal kV weighting for each x-ray tube

Source	U (kV)	Qref (mAs)	Acquisition	Rotation (s)	Pitch	Care Dose 4D	Kernel	Dose level	Slice thickness/Increment (mm)
Tube A+B	120	140	192 × 0.6	0.5	0.6	Yes	Br36	100%	3/2
Tube A	120	98	192 × 0.6	0.5	0.6	Yes	Br36	70%	3/2
Tube B	120	42	192 × 0.6	0.5	0.6	Yes	Br36	30%	3/2

Qref quality reference