Table 1. Fiducial placement quality score.

Question	Answer	Points
Number of markers inside the tumor or < 1 cm?	1	1
	2	2
	≥ 3	3
Number of markers in the extremity of the tumor?	0	0
	1	1
	≥ 2	2
Are the markers positioned in different spatial planes?	No	0
	Yes	2
Is the distance from the biliary stent > 1 mm?	No	0
	Yes	2
Is there an overlap between FEVs?	Yes	0
	No	3
TOTAL		…/12

FEV, fiducial expanded volume (volume comprising a radius of 4 mm around each fiducial marker).