Table 2.

Contribution (percent) to effective dose and to total number of scans from each phase during CT-guided cryoablation of liver tumors.

Procedural phases	Effective dose		Number of scans
	Mean±SD (%)	Range (%)	Mean±SD (%)	Range (%)
Planning	6.7 ± 3.1	3–15	4.2 ± 2.3	2.3–11.1
Targeting	51.3 ± 7.5	38–70	53.8 ± 6.5	36.8–65.9
Monitoring	35.9 ± 7.2	24–48	37.9 ± 6.7	26.0–52.6
Post-ablation survey	6.0 ± 2.8	2–14	4.1 ± 3.2	2.3–17.4

Note: SD, standard deviation. The mean percent contribution of effective dose and the mean number of scans for each phase were significantly different from each other (p < 0.0001) except for the planning and post-ablation survey phases (p > 0.05).