Table 1.

The acquisition and reconstruction parameters used for the three helical CT scan immediately prior to image-guided cryoablation needle insertion

	Non-contrast phase	Arterial and portal venous phases
Tube voltage (kV)	120	120
Quality reference mAs used with CARE dose 4D	180	180
Beam collimation (mm)	24×1.2	64×0.6
Helical pitch	1.2	1.2
Image slice thickness (mm)	3	3
Reconstruction kernel	B30f medium smooth	B30f medium smooth

kV, kilovoltage; mAs, milliampere-second; CARE, combined applications to reduce exposure (Siemens Healthineers).