Lack of Anatomical Concordance between Preablation and Postablation CT Images: A Risk Factor Related to Ablation Site Recurrence

Table 2

Effect of different factors on the Similarity of Positioning Score (SiPS).

	SiPS-id^a (𝑛=52)	SiPS-diff^a (𝑛=45)	P value
Index-tumor size (mean ± SD)^b	14.1 mm (1.9)	13.6 mm (1.8)	0.773
RFA approach^c
Open RFA (𝑛=63)	37 (59%)	26 (41%)	0.203
CT-targeted RFA (𝑛=34)	15 (44%)	19 (56%)
Partial hepatectomy during RFA^c
Yes (𝑛=43)	24 (56%)	19 (44%)	0.838
No (𝑛=54)	28 (52%)	26 (48%)
No. of tumours ablated^c
1-2 (𝑛=70)	40 (57%)	30 (43%)	0.364
≥3 (𝑛=27)	12 (44%)	15 (56%)
Localization^c
Subcapsular (𝑛=76)	44 (58 %)	32 (42 %)	0.140
Central (𝑛=21)	8 (38 %)	13 (62 %)

^aSiPS: Similarity of Positioning Score, identical (SiPS-id) or different (SiPS-diff).
^bStudent’s t-test.
^cChi-square or Fisher’s exact test.