Table 4.

Basic photon beam validation tests summary ^a

Test	Description	Sample tests from literature (7)
5.4	Small MLC‐shaped field (non SRS)	Photon Test 1
5.5	Large MLC‐shaped field with extensive blocking (e.g., mantle)	Photon Test 3
5.6	Off‐axis MLC shaped field, with maximum allowed leaf over travel	Photon Test 2
5.7	Asymmetric field at minimal anticipated SSD	Photon Test 6
5.8	$10\times 10 {\text{cm}}^2$ field at oblique incidence (at least 20°)	Photon Test 10
5.9	Large ($>15 \text{cm}$) field for each nonphysical wedge angle b	–

^aFor all tests, measurements in the high‐dose region, penumbra, and low‐dose tail regions should be compared to calculated values at various depths (including slightly beyond dmax, midrange/10–15 cm, and deep/25–30 cm). SSDs, other than those used at commissioning and that reflect the clinically expected range, should be used. The MLC should be used for tests 5.4–5.6. The MLC or jaws may be used for tests 5.7–5.9.

^bTests 5.4–5.8 are intended for each open and (hard) wedged field. Nonphysical wedges are considered an extension of the corresponding open field in terms of spectra and only require the addition of Test 5.9.