TABLE 1.

Xstrahl 200 unit nominal beam energies, photon beam filtration present, and reference HVLs as beam quality specifiers

kVp	Filtration (mm)	HVL
70	2 Al	2.15 mm Al
100	0.1 Cu, 0.5 Al	4.25 mm Al
125	0.2 Cu, 2.5 Al	8.125 mm Al
200	0.4 Sn, 0.25 Cu, 1 Al	1.85 mm Cu

Abbreviation: HVL, half‐value layers.