Table 1.

Detectability of the fiducials, number of subarcs with all fiducials occluded, maximum and mean angle of these subarcs, modulation index, and number of tracked fractions

	% of images with at least 1 fiducial detectable		#osa	Max. angle	Mean angle	#osa	Max. angle	Mean angle	Modulation index		No. of tracked fractions
Patient no.	Arc_1	Arc_2	Arc_1			Arc_2			Arc_1	Arc_2
1	87.1	62.8	18	37	7	12	11	4	1.38	1.41	8
2	49.0	90.2	14	27	4	21	52	9	1.33	1.41	7
3	60.7	10.9	6	249	64	24	53	7	1.84	1.84	7
4	65.5	44.9	12	59	15	9	50	14	1.59	1.48	2
5	85.4	41.7	15	45	14	12	12	4	1.81	1.60	4
6	77.5	24.4	10	147	24	16	20	5	2.25	2.28	1
7	82.4	13.7	10	164	36	15	18	4	1.53	1.22	2
8	39.9	64.3	18	45	8	16	54	14	2.16	2.01	1