. 2022 Jan 9;23(3):e13522. doi: 10.1002/acm2.13522

TABLE 4.

Differences between the radiation focal point (RFP) and the patient‐positioning system (PPS) center; RFP defined as the midpoint of the full‐width, half‐maximum (FWHM) for the beam profiles and PPS center defined by either the pinprick location or the PPS shot coordinates in the static‐film and moving active detector scans, respectively

Collimator and axis		Film	Microdiamond	W2 scintillator
4 mm	x coord	−0.10 (0.07) ^a	0.01 (0.18) ^a	−0.05
	y coord	0.08 (0.03) ^a	0.0 (0.16) ^a	0.19
	z coord	0.16 (0.28) ^a	−0.5 (0.21) ^a	−0.36
	Δr (mm)	0.20 (0.29) ^a	0.50 (0.29) ^a	0.41
8 mm	x coord	−0.13 (0.1) ^a	0.01 (0.16) ^a	−0.06
	y coord	0.03 (0.2) ^a	0.09 (0.13) ^a	0.18
	z coord	0.17 (0.21) ^a	0.03 (0.23) ^a	0.12
	Δr (mm)	0.22 (0.3) ^a	0.10 (0.3) ^a	0.22
16 mm	x coord	−0.11 (0.09) ^a	0.03 (0.21) ^a	−0.07
	y coord	0.17 (0.18) ^a	0.10 (0.06) ^a	0.19
	z coord	0.05 (0.2) ^a	−0.07 (0.15) ^a	0.30
	Δr (mm)	0.21 (0.28) ^a	0.12 (0.26) ^a	0.36

^{^a}

Data shown in parentheses are from Maraghechi et al.¹⁵, included for comparison.